# DaVinci Resolve Fusion MediaIn Missing Frames on Export

> **Quick answer:** If DaVinci Resolve Fusion MediaIn shows missing frames on export, first confirm the source clip is online and the affected frames play on the Edit page. Then check the MediaIn source, Fusion composition range, clip retiming, and render cache. Render a short test around one missing frame before changing codecs or rebuilding the node graph.

*Published by [TryUncle](https://tryuncle.com) — the on-screen assistant that teaches DaVinci Resolve on your own screen.*
*Updated 2026-11-05 · DaVinci Resolve 21.1 (October 2026) · Canonical: https://tryuncle.com/learn/davinci-resolve/davinci-resolve-fusion-mediain-missing-frames-export*

I’d start with the first frame that fails, not with the export preset. A missing image can come from the source, the timeline, the Fusion node graph, or a cached render, and those problems can look nearly identical in the finished file.

As of October 2026, the current DaVinci Resolve release listed by Blackmagic Design is 21.1. The core diagnostic below applies to Fusion in Resolve, but a control’s name or location can vary by release, composition type, and whether the MediaIn came from the timeline or the Media Pool. Check the [Blackmagic Design support page](https://www.blackmagicdesign.com/support) for the current manual that matches your installed version.

## Why is DaVinci Resolve Fusion MediaIn missing frames on export?

When DaVinci Resolve Fusion MediaIn is missing frames on export, the first job is to find the earliest point in the image path where the frame disappears. Check the source clip, the MediaIn output, the node graph, MediaOut, and then a short test export at the same timeline timecode.

Fusion uses a node graph to process images. In Resolve, MediaIn supplies footage to that graph, and MediaOut sends the composition result back to the timeline. Blackmagic describes MediaIn as the clip from the Edit timeline and explains that nodes are connected to build the effect chain on its [Fusion page](https://www.blackmagicdesign.com/ca/products/davinciresolve/fusion). That distinction matters: an export problem is not automatically a MediaIn problem.

Pick one clearly affected frame. Write down its timeline timecode, then inspect that exact moment in each place:

1. **Edit page:** Does the original timeline clip show the expected picture at this timecode?
2. **Fusion MediaIn viewer:** Does the selected MediaIn node show the expected source?
3. **Downstream node:** Does the image remain correct after each effect, mask, merge, or transform?
4. **MediaOut:** Does the final Fusion output show the expected frame?
5. **Test export:** Does a short render of the same interval match MediaOut?

This sequence separates source failure from composition failure. If the Edit page is already missing the picture, changing a Fusion effect is unlikely to fix the source. If MediaIn shows the correct frame but a later node does not, the source is reaching Fusion and the investigation moves downstream. If MediaOut is correct but the file is wrong, look at cache, render range, and delivery behavior before rebuilding the graph.

Do not diagnose from a single viewer glance. A viewer can display a different node than the one feeding MediaOut, and scrubbing may not reproduce the exact timecode that failed during export. Select the node you want to inspect and compare like with like: same clip, same timeline time, same output stage.

**A missing export frame is a location problem before it is a settings problem.**

For a useful first test, render a short section that begins before the missing frame and ends after it. Keep the frame rate and codec unchanged for that test. The point is not to optimize the final file; it is to see whether the defect follows a particular frame, begins at a trim boundary, or appears only in the rendered result.

If the same frame fails in the same way every time, suspect a source, timing, or node issue. If the failing frame moves, disappears on a second test, or changes after cache clearing, suspect a cached result or an intermittent media-read problem. Those are clues, not proof. Continue through the checks below and record which stage changes the picture.

## How do I identify the first bad frame before changing anything?

Find the earliest bad frame by comparing the same timecode at the source, MediaIn, MediaOut, and export. This avoids “fixes” that only hide a symptom or alter a part of the composition that was working.

Start with a frame that is visibly absent, black, frozen, or replaced by a different picture. Use the Edit timeline’s timecode display to locate it. If you know only the approximate location, advance frame by frame around the break until you can identify the first wrong frame and the last correct one. Write both down. A transition from correct to wrong at a clip boundary means something different from a single missing frame halfway through a continuous shot.

Then inspect the same timecode in the Fusion page. Select MediaIn and view its output. If you have multiple MediaIn nodes, identify which one feeds the failing branch instead of assuming that MediaIn1 is the relevant source. A Fusion Clip can contain multiple timeline layers, and a composition can have more than one MediaIn. The Blackmagic Design forum discussion of [Fusion composition types and media access](https://forum.blackmagicdesign.com/viewtopic.php?p=1052388&t=150418) explains that different composition types expose timeline media differently.

A simple diagnostic record helps:

| Checkpoint | What to note | What the result suggests |
| --- | --- | --- |
| Edit page source clip | Picture present at the bad timecode? | If not, investigate source media, clip timing, or timeline edits first. |
| MediaIn viewer | Expected clip and frame visible? | If not, inspect Media Source, clip identity, online status, and the selected node. |
| First effect output | Does the image disappear after a specific node? | Inspect that node’s inputs, mask, settings, and animation. |
| MediaOut | Does the final comp contain the frame? | If not, inspect the final connections and composition timing. |
| Short export | Does the file match MediaOut at the same timecode? | If not, investigate render range, cache, or export-only behavior. |

This table is a decision aid, not a guarantee that every issue will fit one row. For instance, an image might be visible at MediaIn but cropped or covered by a mask downstream. That is different from a frame that the MediaIn cannot read. Likewise, a black frame at MediaOut might be intentional if the graph creates transparency and the timeline has no visible background beneath the Fusion clip.

Keep the first test small. If you render the entire timeline before identifying the failure stage, you add wait time without gaining much diagnostic information. A short interval also makes it easier to compare the exported frames with the timeline viewer.

Avoid changing several settings at once. If you relink media, change the Media Source, disable a node, and clear cache before the next test, you may get a better file without learning which change mattered. Make one reversible change, test the same interval, and note the result.

## Is the source clip offline or does MediaIn point to the wrong media?

If the source clip is offline, or MediaIn points to a different source than expected, fix the media reference before changing the node graph. Confirm the source file is available and that the affected frame plays on the Edit page.

Check the Media Pool and timeline clip first. An offline-media indicator, a blank viewer, or an incorrect clip at the same timeline position points toward a source or reference problem. Confirm that the project is using the intended original file and that the file can be opened from its current storage location. If you moved footage, mounted a drive after opening the project, or opened the project on another machine, verify the media path before concluding that Fusion is at fault.

Next, identify how the MediaIn was created. Blackmagic’s official description says the MediaIn node represents the clip from the Edit timeline. In practice, a MediaIn tied to a timeline clip is not interchangeable with an independent source dragged from the Media Pool. In a Blackmagic forum explanation, a timeline-connected MediaIn is described as receiving media whose trim and timing are determined by the timeline, while a MediaIn added from the Media Pool exposes a different set of source controls. See the [discussion of timeline and Media Pool MediaIn parameters](https://forum.blackmagicdesign.com/viewtopic.php?f=22&t=120294).

That difference helps explain a common trap: changing a control on a timeline-sourced MediaIn may not repair a timeline trim, because the timeline owns that trim. If the shot starts too late, ends too soon, or references an unexpected clip, inspect the Edit page clip and its source relationship. Do not expect every MediaIn to behave like a standalone file reader.

If the wrong source is feeding the graph, verify the composition type and node connections. A single-clip composition, Fusion Clip, adjustment clip, and Fusion Composition do not all provide timeline material in the same way. An adjustment clip can access composited timeline media beneath it, while other compositions may provide a particular clip or multiple layers. Confirm that the node receiving media is the one you intend to use, especially after duplicating a comp or changing the timeline structure.

#
## What if the source is visible in the Edit page but not in Fusion?

If the Edit page shows the correct image while MediaIn does not, check which MediaIn you are viewing and what source that node references. Select each relevant MediaIn node in turn and inspect its viewer output. In a multi-layer Fusion Clip, the node names alone do not tell you which timeline layer or clip you expect to see.

Look at MediaIn’s Inspector for the Media Source control where available. The source choices and their effect depend on the composition context and Resolve version. In some timeline setups, “Timeline” and “Media Pool” do not produce the same image, and “Background” can refer to lower timeline material rather than the clip directly under the playhead. Do not switch these settings blindly. First determine whether the composition should read the selected clip, a Media Pool source, a background composite, or a particular layer.

If the image starts out correct and disappears only after reopening the project, note that behavior separately. It may involve relinking, a source reference, or cache state rather than a persistent node-graph mistake. Save a copy of the project before experimenting with references or replacing nodes. Then reopen the copy, confirm the source is online, and repeat the same timecode test.

A MediaIn node that is red or shows no image is not proof that the underlying file is corrupt. It can indicate a broken reference, unavailable source, invalid time range, or other failure in supplying an image. Check the actual source file and timeline playback before making a destructive change. If the file itself plays outside Resolve but not in this project, the project reference deserves attention.

## Why does MediaIn show the wrong frame range?

MediaIn can appear to lose frames when the source and timeline ranges do not line up with the composition’s duration. Check the timeline trim, Fusion clip length, composition range, retime, and animated node ranges around the first bad timecode.

A timeline clip has an editable start and end, while the source file has its own available frames. A Fusion composition may be driven by the clip or container on the timeline rather than by the full duration of the original media. The Blackmagic forum’s composition explanation gives an example of a single-clip composition whose frame range corresponds to the portion of a source clip used on the timeline, not necessarily to the full source duration. The details can differ by composition type, so treat the example as a reason to inspect the timeline relationship, not as a universal frame-number formula.

Check the following boundaries:

- **Clip head:** Does the Fusion clip begin before the source has usable frames?
- **Clip tail:** Does the timeline clip extend beyond the available source range?
- **Fusion container:** Is the Fusion Clip or Fusion Composition shorter than the export interval?
- **Effect range:** Does the node or tool have keyframes, range settings, or a time-based control that ends early?
- **Retime:** Does the clip use speed changes, reverse, freeze, or another time remapping?
- **Handle usage:** Does a transition or effect request frames before or after the visible clip range?

If the missing frames cluster at the beginning or end, suspect a range or handle issue before suspecting a random disk failure. For example, if a clip has been trimmed close to its source boundary, an effect that needs frames beyond that boundary may not have the source frames available. The exact behavior depends on the effect and how the clip was prepared, so test the boundary frame rather than assuming that Resolve will hold or invent an image.

If the defect appears only in a retimed clip, temporarily compare it with an unretimed copy in a safe project duplicate. A retime changes which source frames appear at each timeline time. That can make a “missing frame” look like a bad Fusion render when the actual issue is that the source frame requested at that moment is unavailable or is not the one you expected. Do not delete the original retime or replace the clip until you have verified the test.

Also inspect keyframes and animated ranges. A node may be connected correctly but have a control animated to zero, disabled, or outside the expected interval. Scrub around the first wrong frame and check the keyframe editor for the selected tool. If the picture returns immediately after a keyframe, compare the control value on either side of that point.

A worked example: suppose MediaIn shows the shot through most of a clip, then the export has a black frame near the trimmed tail. Check the Edit clip’s endpoint and test the same frame at MediaIn. If MediaIn is black there, inspect source duration and the timeline range. If MediaIn is good but a downstream node turns black, inspect that node’s keyframes, mask, and input connections. This is a diagnostic example, not a report of a test performed on a project.

**A clip’s timeline duration and its source media duration are different ranges.**

## How do I find the Fusion node that removes the frame?

Find the node that removes the frame by following the image forward through the graph at the exact timecode that fails. If MediaIn is correct, inspect each downstream node until the image changes, then test that node’s inputs and controls.

Fusion’s node graph is a connected image path, not a stack of effects applied invisibly. Blackmagic describes Fusion as a node-based workflow in which the node tree shows how tools connect; the [Fusion page overview](https://www.blackmagicdesign.com/ca/products/davinciresolve/fusion) also explains that nodes can represent effects, generators, transforms, and masks. That makes the graph useful for diagnosis: the first connection or tool where a good image becomes wrong is the most informative place to investigate.

Work from MediaIn toward MediaOut:

1. View MediaIn at the affected frame.
2. View the next node in the image path.
3. Continue along the connected path until the image becomes missing, black, frozen, or incorrect.
4. Inspect that node’s inputs, mask, blend, timing, and keyframes.
5. Bypass the suspected node briefly, if safe, and check whether the image returns.
6. Restore the node after the test and decide whether to correct or rebuild it.

Do not assume the node that appears visually closest to MediaOut is responsible. A Merge can receive a correct background but a missing foreground; a mask can hide the entire image; a transform may move the picture outside the frame; a keyer can remove a subject; and a generator can cover the source. Check the inputs of the first failing node, not just its label.

#
## What if MediaIn is correct but MediaOut is black?

If MediaIn shows the correct frame but MediaOut is black, inspect the output path, Merge inputs, masks, and final connections. The problem is downstream of the source unless a different MediaIn feeds the final branch.

Confirm that the image branch you tested actually reaches MediaOut. A viewer can display a node that is disconnected from the final output. Follow the connection lines. If there are multiple branches, trace the branch that reaches MediaOut and identify where the expected source enters it.

For a Merge, confirm the intended background and foreground are connected to the correct inputs. Blackmagic’s Fusion overview describes the Merge node’s yellow control as the background input and green control as the foreground input. That reference is useful when a graph is wired correctly in appearance but the output does not show the expected layer. A wrong connection may hide the desired image even though the source node itself is healthy.

Then check masks. A connected mask that evaluates to zero over the whole image can make an effect disappear or leave the result unexpectedly blank. Temporarily bypass the mask or inspect the mask viewer, then restore it. Check whether the mask has keyframes and whether its animation covers the missing timecode.

If the comp uses transparency, check the Edit page track beneath the Fusion clip. A transparent Fusion output may appear black in an isolated viewer if there is no background behind it. Compare the Fusion result over the intended timeline background. This distinction matters: black pixels inside the rendered image and transparent areas composited over black can look similar in a viewer, but they are different output conditions.

Do not reconnect every node as an experiment. Make a copy of the composition or project first, then change one connection at a time and render a short interval. If bypassing one node restores the missing frame, inspect that node’s settings and timing before replacing it. If bypassing a node does not change the result, restore it and continue tracing.

## Could render cache make the export show stale or missing frames?

A stale or damaged cache can make preview and export behavior disagree, so test the affected frame after clearing the relevant cache. Cache is a later diagnostic step, though: first establish that the source and node graph produce the expected image at the bad timecode.

Resolve may use cached renders to avoid recalculating effects during playback. A cached result can complicate diagnosis when the preview does not reflect a recent edit or when a render uses an earlier result. The [DaVinci Resolve cache location guide](https://tryuncle.com/learn/davinci-resolve/where-to-find-davinci-resolve-cache) covers where cache files are managed; use Resolve’s controls for the project rather than deleting folders by guesswork.

Try a controlled cache test:

1. Save the project.
2. Identify the cache setting or rendered cache indicator for the affected clip or Fusion result.
3. Clear the relevant cache using Resolve’s interface.
4. Reopen or refresh the timeline if needed.
5. Render the same short interval around the known bad frame.
6. Compare the new file with the Fusion viewer and Edit page at the same timecode.

If the test export changes after cache clearing, cache may have contributed. If it does not, move back to source references, timing, and the graph. Cache clearing is not a repair for an offline source or an incorrect MediaIn setting. It can also make playback slower while the render is rebuilt, so clear only the relevant cache when possible.

Be precise about what “export” means here. If you mean a Deliver page render of the timeline, use a short timeline render. If you mean saving frames directly from a standalone Fusion composition, that is a different output path. Resolve’s Fusion page returns its result to Resolve through MediaOut, while standalone Fusion workflows use different media and output nodes. Mixing these workflows can lead to testing the wrong output path.

A useful before-and-after record includes the exact timecode, cache state, render range, and whether the file changed. That gives you a way to distinguish a cache-related change from a source or graph repair. Avoid clearing every cache directory on the system, especially while Resolve is open or while a render is in progress.

## How do I check the export range and render a short test?

A short test render should include the known bad frame and a few frames on either side. Confirm that the selected render range covers the timecode you are diagnosing and that the test output is being compared with the same timeline position.

A common source of confusion is comparing different time references. The Fusion viewer may show a composition frame, while the Deliver page renders a timeline range. If the clip begins later in the timeline, or the export uses an In/Out range, the frame number in one context may not match the frame number in another. Compare timeline timecode, not just a frame count displayed in a different panel.

For the test:

- Set the render range to include the first bad frame and adjacent correct frames.
- Use a straightforward output preset that you can inspect.
- Give the test file a new name so you do not mistake an older render for the latest one.
- Wait for the render to finish before opening the output.
- Seek to the exact timeline timecode in the rendered file and compare it with the timeline viewer.
- If possible, inspect neighboring frames rather than judging a single still.

If the exported clip begins too early or late, verify the timeline In/Out marks, render range mode, and timeline start. If the render is missing only the Fusion effect while the underlying video appears, inspect whether the correct timeline or clip is being rendered and whether the Fusion result has completed processing. If the entire source image is missing at that timecode, return to the MediaIn and source checks.

Do not change the codec to “fix” a specific missing source frame unless the evidence points to an encoder or container problem. A codec change can alter the output file without repairing the underlying composition. First determine whether the Fusion viewer and MediaOut have the correct frame. If those are already wrong, a different delivery codec is unlikely to restore the missing picture.

When the short test is correct but a full-length render is not, capture the exact affected timeline location and compare the full render’s settings and cache state with the short test. A difference in render range or render processing may matter. Do not infer that a long render has a general frame-limit problem from one failure; isolate whether the defect is tied to a particular source frame, a specific section, or the render setup.

## Should I use MediaIn, Loader, or a new Fusion composition?

Use MediaIn when the footage belongs to a Resolve timeline or Media Pool workflow; consider Loader when the composition should read an image sequence or file directly. Replacing MediaIn is not a general export repair because Loader changes how Fusion receives and times the media.

Blackmagic’s Fusion documentation describes MediaIn as the Resolve-side source node, while the older Fusion manual distinguishes Loader behavior for external files. The [Fusion 20.3 Reference Manual](https://documents.blackmagicdesign.com/UserManuals/FusionManual.pdf?_v=1724310010000) explains Fusion’s render workflow and source handling. The MediaIn-versus-Loader choice is also the focus of [this Resolve guide](https://tryuncle.com/learn/davinci-resolve/davinci-resolve-fusion-mediain-vs-loader).

Use this decision table:

| Situation | Better first choice | Why |
| --- | --- | --- |
| A clip already edited on the Resolve timeline | MediaIn | The timeline supplies the clip and its editorial timing. |
| Footage selected from the Resolve Media Pool | MediaIn | Resolve keeps the source within the project’s media workflow. |
| An external image sequence needed by a Fusion composition | Loader may fit | Loader is designed to read media from a file path in Fusion workflows. |
| A standalone Fusion composition that owns its source timing | Loader may fit | The comp can read a source independently of a Resolve timeline clip. |
| A missing frame in a timeline clip’s MediaIn | Diagnose source, range, and graph first | Switching nodes can change the workflow without fixing the original cause. |

Older Fusion documentation describes a Loader “Missing Frames” menu with behaviors such as failing, holding the previous frame, outputting black, or waiting for a frame. Those options belong to Loader documentation and should not be assumed to describe a timeline MediaIn in your installed Resolve version. See Blackmagic’s [Fusion Tool Reference](https://documents.blackmagicdesign.com/UserManuals/Fusion9_Tool_Reference.pdf?_v=1501601400000). The important takeaway is to distinguish the two source paths instead of treating their controls as interchangeable.

A Loader can be appropriate when an image sequence is the actual source problem. If numbered files are absent, misnamed, stored in a different directory, or not read as the intended sequence, changing the input node may help only after you correct the sequence path and frame naming. For Resolve-managed footage, keep the source in the project and troubleshoot MediaIn rather than adding an independent file reader just to make a frame appear.

A new Fusion Composition is useful when you intentionally want a standalone timeline container rather than a composition attached to one selected clip. It is not a magic repair for a bad MediaIn. If you create a new comp, verify which timeline layers are available, whether the correct background is accessible, and whether the composition duration covers the intended render.

**Change the source node only when the source workflow should change.**

## What changes when the footage is an image sequence?

For an image sequence, check the sequence’s numbering, directory, and missing files before rebuilding the Fusion graph. Resolve and Fusion cannot render a source frame that is absent from the sequence unless the chosen source behavior supplies another valid frame.

An image sequence is a set of separate image files interpreted as consecutive frames. That makes file naming and sequence selection part of the media reference. If one numbered image is missing, the visible symptom may be a gap at a specific frame even though the adjacent images load correctly. If the sequence was imported incorrectly, Resolve may treat files as separate stills rather than one sequence, or the path may point to the wrong range.

The sibling guide [DaVinci Resolve image sequence missing frames after import](https://tryuncle.com/learn/davinci-resolve/davinci-resolve-image-sequence-missing-frames-after-import) is the better starting point when the gap appears before the sequence enters Fusion. Check the file list outside the node graph and confirm the expected numbered frames exist. Then confirm the sequence interpretation and range in the application you are using.

If the image sequence works in the Edit page but not in Fusion, inspect the MediaIn context and the source range. If the sequence is read through Loader, verify the Loader path and sequence settings rather than assuming the Resolve MediaIn controls apply. The older [Fusion Tool Reference](https://documents.blackmagicdesign.com/UserManuals/Fusion9_Tool_Reference.pdf?_v=1501601400000) documents Loader missing-frame options, but those options should be treated as Loader-specific and version-sensitive.

Do not replace a sequence with a movie file as the first diagnostic step. That changes the source format, timing, and possibly color interpretation at once. Instead, test the sequence around the first missing number, confirm the image files exist, and see whether the error remains when the source is read independently of the timeline. If you do transcode or consolidate media later, keep the original sequence and project intact until the new source has been verified.

## What should I check on Mac and Windows?

On Mac and Windows, use the same frame-by-frame diagnosis, but verify that the storage volume containing the media is mounted and accessible to Resolve. A project can open while a source drive, network share, or removable volume is unavailable.

If the project moves between computers, check path and drive differences. A media folder mounted under a different volume name or drive letter can break references even when the files themselves are intact. Reconnect or relink the source through Resolve’s media controls, then verify the same timeline frame before opening Fusion again.

On either platform, check for source files stored on removable or network storage. A file that intermittently becomes unavailable can create inconsistent playback or render behavior. For a clean test, confirm that the source remains reachable throughout the short render. Avoid unplugging the drive, sleeping the system, or changing network availability during a test render.

The symptom alone does not identify an operating-system issue. If the failure occurs at the same frame on the same project after the source is online and the node graph is correct, gather the Resolve version, operating system version, source codec, storage location, and a short reproducible range before escalating. Blackmagic’s [Support Center](https://www.blackmagicdesign.com/support) provides the current support resources and documentation.

Keep the project portable where possible. The [Resolve project archive guide](https://tryuncle.com/learn/davinci-resolve/how-to-archive-a-davinci-resolve-project-without-losing-media) explains how to package a project and its media. A portable copy can help distinguish a project-reference problem from a source file that is itself damaged, although moving media should be done carefully and verified before deleting originals.

Do not treat a disk-speed upgrade as the default fix. It may help with broader playback or render bottlenecks, but it does not explain why a particular MediaIn frame is absent. Confirm the file, path, and timecode first. If the source lives on a network share and only some reads fail, test a local copy of the relevant media as a diagnostic, not as proof that the whole storage system needs replacement.

## When should I clear cache, rebuild nodes, or contact support?

Clear cache only after confirming the source and graph, rebuild only the affected branch when a specific node is responsible, and contact support when the issue remains reproducible with an online source and a minimal test. Preserve the project before making structural changes.

A useful escalation package includes:

- DaVinci Resolve version and whether it is Free or Studio.
- Operating system and version.
- The source media type and where it is stored.
- The exact timeline timecode of the first missing frame.
- Whether the Edit page, MediaIn viewer, MediaOut, and short export each show the frame.
- A concise description of any retime, Fusion Clip, adjustment clip, or external sequence involved.
- A copy of the project or a minimal reproduction, if it can be shared safely.

The manual and support center are better references for version-specific controls than old forum descriptions. Blackmagic’s current support page lists the available manuals, including the current DaVinci Resolve release, so check it before relying on an older menu name. A forum post can help identify a pattern, but treat it as a report from that user’s setup rather than a universal fix.

Save a duplicate project before removing MediaIn, replacing a Loader, flattening a Fusion Clip, or rebuilding a node branch. If you must test a major change, do it in the duplicate and render the same short range. A clean test should change one variable at a time.

If you want help locating the relevant control while you work, [TryUncle](https://tryuncle.com/) is the on-screen assistant for DaVinci Resolve on Mac and Windows. Ask in plain words and Uncle points at the exact control on your screen.

## How do I fix DaVinci Resolve Fusion MediaIn missing frames on export?

Use this order: find the first bad frame, check the source on the Edit page, inspect the correct MediaIn, trace the node graph, verify timing and render range, then test after clearing relevant cache. This order narrows the problem before you change the composition.

1. **Record the first bad timecode.** Identify the earliest frame that appears missing, black, frozen, or wrong. Note the preceding correct frame.
2. **Check the Edit page.** Confirm that the source clip displays the intended picture at that exact timeline time. If it does not, investigate media availability, clip identity, and timeline trim.
3. **Inspect the MediaIn node.** Select the node that actually feeds the affected branch. Confirm that it references the intended timeline clip, layer, background, or Media Pool source.
4. **Trace the image to MediaOut.** View nodes in order. Find the first node where the correct image becomes incorrect, then inspect its inputs, mask, settings, and keyframes.
5. **Check boundaries and time remapping.** Verify the clip head and tail, Fusion container duration, retime, effect range, and any animated controls around the problem time.
6. **Render a short test.** Include the known bad frame and neighboring frames. Confirm that the render range and timecode match the timeline position you inspected.
7. **Test cache only if needed.** Save the project, clear the relevant cache through Resolve, and render the same interval again.
8. **Make one targeted repair.** Relink media, correct the range or node setting, or rebuild the affected branch. Repeat the same test before rendering the full project.

#
## What result confirms the fix?

The repair is confirmed when the correct source frame appears at the same timecode in the Edit page, the relevant Fusion output reaches MediaOut, and a short export contains that frame. Check the neighboring frames too, because a fix that replaces one bad frame with a freeze or shifts the gap may not have repaired the underlying timing.

Once the short test is clean, render the full intended range and inspect the affected section in the finished file. A full render is the final check, not the first diagnostic. Keep the project copy and the clean short render until you have verified the delivery file.

## Which advice about Fusion MediaIn is safe to reuse?

The reliable rule is to identify which system owns the source and timing before changing nodes. A timeline clip, a Media Pool source, a Fusion Clip, and a Loader can expose different media and timing behavior.

A short expert perspective can help explain why following the image path is more useful than guessing at a setting. In an interview, filmmaker David F. Sandberg said of Fusion, “The biggest strength is that it’s node based and I feel it was pretty easy to learn.” The quote reflects his view of Fusion’s node workflow, not a guarantee about diagnosing exports. Read the [full interview with David F. Sandberg](https://openvisualfx.com/2017/06/16/interview-with-david-f-sandberg/amp/).

For this specific failure, the practical implication is simple: inspect connections in order. A correct MediaIn image can still be hidden by a Merge, mask, transform, or animation. A correct graph can still fail if the timeline source is offline or the composition does not cover the rendered interval. And a correct viewer does not prove that the final exported file is correct until you test the same timecode.

Separate observed facts from assumptions while you troubleshoot. “The source is visible in the Edit page at 00:00:12:08” is an observation. “The codec caused the gap” is a theory until a controlled test supports it. Recording the observations keeps you from rebuilding the entire comp based on a guess.

When the evidence points to an external sequence, investigate that sequence as media. When it points to a specific node, investigate that node. When it appears only in the rendered file, compare render range and cache. If the frame is absent at every stage, start with the source itself. One exact timecode often tells you more than a long list of general export settings.

**The fastest useful test is a short render of one known bad frame and its neighbors.**

FAQ below is drawn from the frontmatter.

## What is the next step if the export still has missing frames?

If the export still has missing frames, preserve the project and reduce the problem to one reproducible timecode and one short render. Report which stage first loses the image: source, MediaIn, downstream node, MediaOut, or export. That evidence is more useful than changing codecs or rebuilding the whole composition.

Use the current manual for your installed DaVinci Resolve version, because control names and behavior can change between releases. If the source is an image sequence, check its numbering and file path separately. If the source is timeline footage, confirm the clip and its timing before replacing MediaIn with another source node.

Start with the first failing frame. Then follow the image. That is the repair path.

## FAQ

### Why is DaVinci Resolve Fusion MediaIn missing frames on export?

A Fusion export can miss frames when the source media is offline, the MediaIn references a different source than expected, the composition or clip does not cover the rendered time range, or a retime or stale cache affects the result. Find the first bad frame, check it on the Edit page, and render a short range around it.

### How do I fix Fusion MediaIn frames that are black in the exported video?

Check the same frame in the MediaIn viewer, at MediaOut, and in the Edit page. If it is already black at MediaIn, check the source and Media Source setting. If it becomes black farther down the node graph, inspect the connected effect, mask, merge, or keyframe. If only the export is wrong, clear the relevant cache and test a short render.

### Why does Fusion show the right frame but export a different one?

The viewer may be showing a different timeline position or a cached preview than the frame being rendered. Compare the same timecode in the Fusion viewer, Edit timeline, and test export, then check clip retiming, Fusion composition duration, render range, and cache.

### Can a Fusion MediaIn export missing frames because the clip is retimed?

Yes, a retime can make the relationship between timeline frames and source frames less obvious. Compare the retimed clip with an unretimed test, confirm the affected source frames are available, and verify the Fusion result across the whole clip rather than at one playhead position.

### Should I replace MediaIn with Loader to fix missing frames?

Not as a first step. MediaIn is the usual choice for footage managed by a Resolve project or timeline. Loader is useful when a Fusion composition needs to read an image sequence or file directly, but switching nodes changes how the source and timing are managed.

## Sources

- [DaVinci Resolve Support Center and current manuals](https://www.blackmagicdesign.com/support)
- [Fusion 20.3 Reference Manual](https://documents.blackmagicdesign.com/UserManuals/FusionManual.pdf?_v=1724310010000)
- [Fusion 9 Tool Reference, Missing Frames options](https://documents.blackmagicdesign.com/UserManuals/Fusion9_Tool_Reference.pdf?_v=1501601400000)
- [DaVinci Resolve Fusion page](https://www.blackmagicdesign.com/ca/products/davinciresolve/fusion)
- [Blackmagic Design forum discussion, Fusion composition types and media access](https://forum.blackmagicdesign.com/viewtopic.php?p=1052388&t=150418)
- [Blackmagic Design forum discussion, MediaIn source and timeline clips](https://forum.blackmagicdesign.com/viewtopic.php?f=22&t=120294)
- [David F. Sandberg interview](https://openvisualfx.com/2017/06/16/interview-with-david-f-sandberg/amp/)