“Invalid data found when processing input” is an FFmpeg error label, not a diagnosis of one specific YouTube playlist problem. To fix it, first determine whether yt-dlp failed while downloading or whether the download finished and FFmpeg failed during merging or other post-processing. Then inspect the exact file and FFmpeg version named by the log; the right fix depends on that evidence.
What the error means
FFmpeg uses this message to describe AVERROR_INVALIDDATA: it encountered input data it could not process. The wording alone does not identify whether the cause is a damaged or incomplete file, a format-specific problem, or an FFmpeg bug. FFmpeg’s error-code documentation defines the error, but it cannot diagnose a particular yt-dlp run.
In a YouTube playlist workflow, the error can appear at different stages. A yt-dlp issue report documents audio and video downloads reaching 100% before FFmpeg failed during the merge, with the error pointing to the audio input. Other reports concern live or post-live DASH content and an HDR VP9/HLS context. These are distinct examples, not proof of a universal playlist cause.
First identify which stage failed
Capture a verbose log
- Run the affected playlist item again with yt-dlp’s verbose option,
-v, and save the complete terminal output. Keep the log private if it contains account or other sensitive information. - Find the last download and post-processing messages. If retrieval failed before a local media file was completed, investigate the download stage. If yt-dlp reports the audio and video downloads complete and then invokes FFmpeg, investigate the merge or other post-processing stage.
- Record the exact filename FFmpeg says it cannot process, the full FFmpeg command shown in the log, and the installed FFmpeg version. These details determine which checks are relevant.
A reported merge failure occurred after both downloads reached 100%, and FFmpeg identified the audio input. In a log like that, the playlist itself is not necessarily the failure point: inspect the named local input and merge operation first. See the yt-dlp issue report for that example.
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Separate playlist-wide problems from one-item failures
Use the log to identify the specific playlist item that failed. Test that item by itself, then compare its format and processing path with an item that succeeds. If only one item fails, its input or delivery format may be relevant; if several fail at the same stage, check the shared tool versions and processing setup. The documented cases do not establish a universal format selector, skip option, or other single command-line switch that resolves every instance.
Check for a matching FFmpeg regression
Before changing FFmpeg, compare your log’s format and processing path with the scenario in the yt-dlp known-issues index. It records version-specific examples: a live/post-live/DASH case involving duplicate ftyp data was associated with FFmpeg 6.1, with an upgrade to 6.1.1 or a specified newer master build listed as a fix. A separate HDR VP9/MP4 issue described an FFmpeg bug and listed FFmpeg 7.0.1 or latest master.
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Those are historical, scenario-specific recommendations, not general instructions to install either version today. Check the current issue entry, confirm that your format and processing path match, and verify your installed version before applying a version change. If they match, update to a version documented for that case and retest the affected item. If they do not, do not assume an upgrade to one of those versions will fix your error.
Inspect the local input FFmpeg names
If the log points to a downloaded file, check whether the file exists, appears complete, and contains the streams you expect. Use ffprobe to inspect its detected container and streams; compare those results with its filename extension rather than assuming the extension proves the actual format. If the download looks incomplete, verify it before attempting a container change or re-encoding.
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A general FFmpeg troubleshooting guide recommends identifying a file’s actual type before attempting repair and treating re-encoding as a last resort. That is general local-file advice, not evidence that a particular YouTube download has a specific fault or can be recovered. Re-encoding cannot be assumed to restore missing or invalid source data.
Choose the fix that matches the evidence
| What the log shows | What to check or do |
|---|---|
| Download fails before a completed local input is available | Investigate retrieval and the specific item’s format or delivery path. The post-processing workarounds below do not establish a fix for a retrieval failure. |
| Downloads finish, then FFmpeg fails while merging | Inspect the named input, the merge command, and the installed FFmpeg version. Do not treat completed downloads as proof that the later merge succeeded. |
| The item and version match a documented FFmpeg regression | Follow the version guidance in the matching current yt-dlp issue entry, then retest that item. |
| The local file appears incomplete or its detected type differs from expectations | Verify the file and its container before attempting repair. A new container or re-encode is not guaranteed to recover incomplete data. |
| The evidence does not match a documented case | Keep the full verbose log and compare it with current yt-dlp project guidance. Avoid applying an old workaround based only on the shared error wording. |
Common mistakes that prolong troubleshooting
- Blaming the whole playlist: isolate the item and stage named in the log before changing playlist options.
- Changing format selectors without evidence: the known cases involve different formats and processing paths; none establishes one selector as a general fix.
- Updating FFmpeg to an unrelated historical version: use version advice only when the documented scenario matches your input and installed version.
- Re-encoding immediately: first determine whether the file is complete and what it actually contains.
- Keeping only the final error line: the preceding download and FFmpeg command messages may distinguish retrieval failure from post-processing failure.
Keep a YouTube channel live without running FFmpeg on your own computer
This error concerns a yt-dlp download or FFmpeg processing workflow. If your separate goal is to keep pre-recorded videos playing as a 24/7 YouTube live stream, StreamNeo is a cloud option rather than a repair for this error: upload your video or build a playlist, add your YouTube stream key once, and go live. The cloud handles looping, so your computer and home connection do not need to stay on.
Or let it run in the cloud
- Upload a recording or build a playlist, add your YouTube stream key, and go live.
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StreamNeo streams to YouTube and plays uploaded videos; it is not a camera-live service or a fix for a broken local download. See StreamNeo for details, or start the free first day.
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