Invalid data found when processing input is a broad FFmpeg error, not a diagnosis of one YouTube playlist problem. To fix it, first identify which item and which step failed: retrieving media, merging streams, or another post-processing operation.
That distinction matters because a playlist download can finish successfully before FFmpeg fails on a local file. Capture the full yt-dlp log, note the input filename and installed FFmpeg version, then compare the evidence with the relevant case before changing anything.
What the message tells you—and what it does not
FFmpeg uses this wording for AVERROR_INVALIDDATA: it encountered data it could not process as valid input. The FFmpeg error-code documentation defines the label, but it does not identify which part of your workflow produced the data or why it was rejected.
In a YouTube playlist workflow, the message might appear while yt-dlp retrieves media, or later when it asks FFmpeg to merge or otherwise process downloaded files. The same wording has also appeared in reports involving different delivery formats and FFmpeg versions. That makes the log context more useful than the error text by itself.
Do not start by assuming the playlist is malformed, that every item is affected, or that a particular format option is the answer. A failed playlist item, an incomplete local file and a version-specific FFmpeg problem call for different checks. A workaround that matches one reported case may do nothing for another.
A successful download message is useful evidence, but it does not prove that post-processing succeeded. Likewise, a line naming FFmpeg does not by itself prove that FFmpeg is the root cause: it may be reporting that an input produced or saved earlier in the workflow could not be read.
Locate the failing file and stage
Re-run the affected item with yt-dlp verbose logging enabled and save the complete output, rather than copying only the final error line. The sequence of messages should show whether yt-dlp failed while fetching a format or whether it reached an FFmpeg command after retrieving the media. Record the exact item, format information shown in the log, command stage and installed FFmpeg version.
Look for the final named input in FFmpeg’s error output. Is it a remote URL or a local path? Does the log show a temporary audio file and a separate video file, followed by a merge command? Did both downloads reach completion before the error? These details help distinguish a retrieval failure from a local-file processing failure.
One yt-dlp report documents audio and video downloads completing before FFmpeg failed during a merge, with the error associated with the audio input. That is a reason to inspect that named file and the merge step in a similar log; it is not proof that all playlist errors happen there. The yt-dlp issue report is an example to compare against, not a universal diagnosis.
Make a short record before experimenting: playlist item, last successful operation, failing filename, formats or delivery path mentioned, FFmpeg version, and whether other items work. If you later test a change, keep a copy of the original log so you can tell whether the failure moved or actually went away.
For a long-running recorded stream, a repeatable media file matters as much as the live output. The practical checks in setting up a recorded Spanish-lessons stream are relevant once your source files are readable; first establish that this particular file is not failing during preparation.
Separate playlist parsing from media processing
A playlist is a list of items and extraction work; FFmpeg operates on media inputs at a later point when the workflow asks it to. A playlist-level problem would be suggested by errors while yt-dlp reads or selects entries, before it has a media file to pass to FFmpeg. A post-processing failure is suggested by successful retrieval messages followed by an FFmpeg invocation and an error naming a downloaded input.
Use the item boundary as a diagnostic tool. If the log identifies an item number or title, test that entry by itself rather than repeatedly running the whole list. If one item fails while others proceed, compare its available formats and the operations performed on it with a working item. If all entries stop at the same earlier stage, the evidence points elsewhere than one malformed media file.
Do not confuse playlist parsing with an item that happens to be delivered in separate audio and video streams. In the latter case, the playlist can be valid and the downloads can complete, while the merge of local inputs fails. Conversely, if no download completed, changing merge settings is premature.
This separation also prevents destructive troubleshooting. Do not delete a whole download directory or rebuild a playlist until the log shows what was actually retrieved. Preserve the affected files if practical; they may let you inspect whether the input is complete and what streams FFmpeg detects.
If your eventual goal is to broadcast a prepared archive rather than repeatedly process a YouTube playlist, it helps to keep the workflow question separate from this error. The article on streaming a cartoon playlist around the clock addresses the channel format; this page is about finding the failed file and stage in an FFmpeg-based workflow.
Check yt-dlp downloads and post-processing
Read the verbose output from top to bottom around the first failure. Identify the requested item and formats, whether the media retrieval started and completed, and whether yt-dlp then invoked FFmpeg for a merge or another post-processing task. The first unsuccessful operation is usually more informative than later summary messages.
When downloads appear complete but the merge fails, focus on the exact local input named in the FFmpeg output. Check that the file exists, has a plausible size for the item, and is not still being written by another process. A file extension is only a label; it does not establish that the contents are a valid file of that type. If the file seems incomplete, a fresh download of that specific item is a more targeted test than changing every format setting in the playlist.
If the failure happens during retrieval, do not treat a later merge option as the fix. Keep the log showing the extraction and download stage, update or check the current yt-dlp project guidance for the relevant failure, and compare whether the problem is isolated to one item or one delivery path. A playlist may combine items that take different routes, so a setting that succeeds for one entry is not evidence that it explains another.
The yt-dlp known-issues index and individual issue records can help you check whether your log resembles a documented case. Project reports are tied to their own formats, versions and circumstances. Read the current entry and surrounding discussion rather than lifting a command from an old comment without checking whether its conditions match.
For local inspection, ffprobe can report a file’s detected container and streams. Run it on the named downloaded input, not on a different source file, and compare its output with the filename and the intended media. If it cannot read the file, that supports investigating the file or its completeness; it does not establish whether the original problem was a network interruption, a download issue or something else. The general guidance in this FFmpeg file-troubleshooting article is useful for checking what a file actually contains, but it is not evidence of a specific yt-dlp cause.
Avoid re-encoding as an early experiment. It adds time and can obscure the original problem, particularly if the file is incomplete or the wrong input is being examined. First establish what the file is, what FFmpeg can detect and which operation fails.
Check FFmpeg versions and recent changes
Version-specific regressions are real possibilities, but version advice must match the case. The yt-dlp known-issues notes describe distinct FFmpeg-related situations: one involving live, post-live or DASH content with duplicate ftyp data, and another concerning HDR VP9 in an MP4 context. These examples do not establish a universal playlist fix.
The project notes associated the former case with FFmpeg 6.1 and listed 6.1.1 or a specified newer master build; the HDR VP9/MP4 case listed FFmpeg 7.0.1 or latest master. These are historical, scenario-specific recommendations, not general instructions for every current installation. Check the current issue entry and compare its format, processing path and affected version with your log before acting.
Write down the output of ffmpeg -version and, if available, the version used by yt-dlp. In systems with multiple installations, the command you run in a terminal may not be the same binary that yt-dlp finds. Check the actual path or invocation in verbose output where possible, especially after an update.
If your failure began after changing FFmpeg or yt-dlp, record what changed and test the affected item with one controlled adjustment at a time. An update may resolve a documented regression, but moving to a different build can introduce different behaviour. Keep the original setup or a straightforward way back until the single-item test has completed.
The yt-dlp report on the live/post-live/DASH case and the project’s known-issue notes can help you assess whether that scenario is relevant. Match the evidence, not just the wording of the error. A playlist item using a different format or a failure occurring at a different stage is not made equivalent by sharing the same FFmpeg message.
Test one affected file on its own
Once you have identified the affected item, isolate it from the rest of the playlist. Use yt-dlp’s item-selection facilities to retrieve or process only that entry, preserving the same format choice and post-processing path where the log indicates those details matter. The purpose is comparison, not trying an arbitrary collection of flags.
If a single-item run succeeds, compare its selected formats, filenames and processing steps with the original playlist run. The difference may be in how the item was selected or processed, or the original failure may not be reproducible. If it fails in the same way, the smaller log should make the relevant input and stage easier to inspect. If other entries also fail, test one representative working and one failing item to see whether they share a format or operation.
For a post-processing failure, where appropriate, run FFmpeg’s probe tool against the named local file and retain the output. If FFmpeg identifies streams, compare those with the intended input. If it cannot read the file, verify that the download is complete before trying a container change or re-encoding. Do not rename a file and assume its contents have changed.
Record each test as a small comparison: item, input file, selected formats, last completed stage, FFmpeg version and result. Change only one relevant factor at a time. This makes it possible to tell whether a version change, a fresh download or a different input path affected the outcome.
Playlist failures can also be mistaken for a playback or streaming issue downstream. If your media has already been prepared and the problem is what viewers see during a live broadcast, use a separate diagnosis such as checking why a prerecorded YouTube live stream buffers. A viewer buffering problem does not explain an FFmpeg error during local post-processing.
Choose a fix that follows the evidence
There is no single switch that resolves every instance of this message. Use the stage, named file and format evidence to select the smallest useful test, then rerun the affected item before processing the entire playlist again.
| What the log shows | What to check next | What not to assume |
|---|---|---|
| Retrieval fails before a local input is available | The extraction or download error, affected item and current yt-dlp guidance | That a merge option or local-file repair applies |
| Audio and video complete, then a merge fails on a named file | That exact input, its completeness and the FFmpeg merge invocation | That playlist parsing or every downloaded item is broken |
| A format and processing path match a documented FFmpeg regression | The issue’s affected version and currently documented remedy | That its version advice applies to other formats or stages |
| A local file cannot be identified or appears incomplete | Probe the file, compare its extension and contents, and verify the download | That renaming or re-encoding will restore missing data |
| The log does not resemble a documented case | Preserve full verbose output and consult current project guidance | That an old workaround applies because the error wording matches |
If the log matches a documented regression and the installed version is in the affected range, follow the current project recommendation for that scenario, then retest only the failing item. If the error comes after completed downloads, examine the specific local input and merge operation. If the file appears malformed or incomplete, verify it before trying repair. When the evidence points to neither path, retain the full log and seek current yt-dlp guidance rather than guessing.
Do not treat one successful retry as proof of a permanent fix. Compare the same item and processing path, and note the version and settings that succeeded. If you manage a channel from a prepared video file and the repeated work of keeping a computer on is a separate operational burden, StreamNeo can remove that specific need by taking an uploaded file and running it as a 24/7 YouTube live stream while your computer is off. That does not repair a malformed source file or change yt-dlp’s diagnosis, so resolve and validate the media first.
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FAQ
Why does yt-dlp say “Invalid data found when processing input”?
The phrase is FFmpeg’s invalid-input-data error label, not a unique yt-dlp diagnosis. Check the verbose log to learn whether it occurred during retrieval or after yt-dlp handed a local file to FFmpeg for processing.
Why did the download finish but FFmpeg fail afterwards?
yt-dlp can retrieve media and then invoke FFmpeg for a merge or another post-processing step. If both streams finished downloading, inspect the exact local input named in the final error and the merge invocation; completion alone does not prove that post-processing succeeded.
Should I update FFmpeg to a particular version?
Only when your format, processing path and installed version match a documented version-specific case. The historical version notes apply to particular reports, not every playlist failure, so check the current yt-dlp issue entry before changing builds.
Can I fix the error by converting or renaming the file?
Not without first checking what the named file contains and whether it is complete. Use a probe tool such as ffprobe to inspect its detected container and streams; renaming does not change file contents, and re-encoding cannot reliably restore missing data.