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FFmpeg’s “Invalid data found when processing input” message does not identify one specific YouTube playlist problem. First determine whether yt-dlp failed while downloading, or whether the download completed and FFmpeg then failed during a merge or other post-processing step. The failing stage, named input file, media format, and FFmpeg version point to the next useful check.
What the error means
FFmpeg defines this message as the description for AVERROR_INVALIDDATA: it encountered invalid input data. That label is not a diagnosis of why the data was invalid, and it does not by itself show that the playlist is broken. See the FFmpeg error-code documentation.
In a yt-dlp workflow, the error can arise at different points. A reported case shows the audio and video downloads reaching 100%, followed by FFmpeg failing during the merge on the audio input. Other documented cases concern particular live, post-live, DASH, or HDR VP9/HLS contexts. Those examples establish that the message has more than one possible context; they do not establish the cause in your setup.
Find the stage that failed
Capture a complete verbose log
Run the affected playlist item again with yt-dlp verbose logging enabled and save the full output. For example, add -v to the command you normally use:
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yt-dlp -v "VIDEO_URL"Replace VIDEO_URL with the affected video’s URL. If the failure occurs only when processing a playlist, use the playlist command that produced the error and preserve its complete verbose output. Avoid changing format selectors or post-processing options before capturing the failure: doing so can obscure the original stage and input.
Read the lines immediately before the error
- If yt-dlp reports a retrieval or download failure before invoking FFmpeg, investigate that download stage.
- If the media downloads complete and yt-dlp then invokes FFmpeg for a merge or another post-processing task, investigate that invocation and the exact input filename named in the error.
- Record the installed FFmpeg version and, where shown, the selected formats or delivery path. The same error text alone is not enough to choose a version change or workaround.
One yt-dlp report records completed audio and video downloads followed by a merge failure on the audio input. In that situation, the log points to post-processing and the named local input—not to a general failure of every video in the playlist. See the yt-dlp issue report.
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Check for a version-specific FFmpeg issue
The yt-dlp known-issues index documents separate FFmpeg-related cases with scenario-specific version notes. One historical case involving live or post-live DASH content and duplicate ftyp data associated the regression with FFmpeg 6.1 and listed an upgrade to 6.1.1 or a specified newer master build. A separate HDR VP9/MP4 issue described an FFmpeg bug and listed FFmpeg 7.0.1 or latest master. These are not universal fixes for playlist errors, and the notes may no longer describe current versions.
- Open the yt-dlp known-issues index and locate the entry that matches your content type and processing path.
- Compare the documented scenario with your verbose log: live/post-live or DASH, HDR VP9/MP4 or HLS, and the point at which FFmpeg fails.
- Check your installed FFmpeg version. Update only if the reported issue matches your case and the project guidance identifies a relevant version change.
- Retest the same affected item and preserve the new log so you can see whether the failure stage or message changed.
Do not install 6.1.1, 7.0.1, or a master build simply because the error text matches. Those version references belong to particular historical reports; they are not a blanket recommendation for every current system.
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Inspect the named local input
If FFmpeg identifies a downloaded audio or video file as the failing input, check that file before trying to repair or convert it. Use ffprobe to inspect its detected container and streams:
ffprobe "path/to/failing-file"Use the exact path from the log, quoting it if it contains spaces. Compare the file’s detected type and streams with its extension, and check whether it appears incomplete. A general FFmpeg troubleshooting guide recommends identifying the actual file/container before attempting repair; that guidance does not prove why a particular YouTube download failed or guarantee that an incomplete file can be recovered. See Outbyte’s general troubleshooting guidance.
If the file is incomplete or does not contain the expected streams, retrying the affected item may help establish whether the problem is reproducible, but the available reports do not establish a guaranteed recovery method. Avoid re-encoding as a first response: it cannot restore missing source data.
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Isolate the playlist item and its format
Test the single item identified by the log, then compare its format and post-processing path with an item that succeeds. In particular, note whether the affected item uses separate audio and video inputs, or belongs to a live/post-live, DASH, or HDR VP9/HLS case resembling a documented report.
The documented cases do not establish one universal yt-dlp format selector, playlist flag, or skip option that fixes all instances of this error. Do not apply a command-line switch just because it appears to address a different failure stage or media context.
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Choose the next step from the evidence
- Download failed before FFmpeg started: keep the verbose log and investigate the retrieval/download error shown there; the invalid-data message may not be the first failure.
- Download completed, then a merge failed: focus on the merge invocation and the exact local input FFmpeg names. Inspect that input and compare its detected streams and apparent completeness.
- Your content and version match a known regression: follow the current yt-dlp issue guidance for that specific case, update accordingly, and retest the same item.
- No documented case matches: retain the complete verbose log, the failing filename, the affected format or delivery path, and the FFmpeg version. Consult current yt-dlp project issues rather than assuming an older workaround applies.
Common troubleshooting mistakes
- Blaming the whole playlist from one item: isolate the item that failed; the error is not proof that all playlist entries are invalid.
- Treating a completed download as a failed download: if the log shows downloads completed before FFmpeg starts, troubleshoot the post-processing input and merge stage.
- Updating FFmpeg without matching the reported scenario: the known version notes concern distinct historical regressions, not every occurrence of
AVERROR_INVALIDDATA. - Renaming or re-encoding before inspection: first establish what the local file contains and whether it appears complete; a new extension or encode does not repair missing data.
Or let it run in the cloud
If your underlying goal is to keep a YouTube channel live by looping uploaded videos, rather than to fix a yt-dlp download or merge, StreamNeo is a separate option: it plays uploaded recordings in a 24/7 YouTube stream. It does not repair FFmpeg files or go live from a camera.
- Upload a recording or build a playlist.
- Add your YouTube stream key once.
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