When FFmpeg reports “Permission denied” while reading playlist videos on Linux, first find which account runs FFmpeg, then check that account’s access to the playlist, every listed video, and each directory in their paths. The error identifies an access-denied condition, but does not by itself tell you which path failed. If the message is instead “Unsafe file name,” investigate the concat demuxer’s path-validation rules; changing its safe option is not a filesystem permission fix.
Identify which playlist mechanism you are using
“Playlist” can refer to different FFmpeg concatenation methods, and their options are not interchangeable. The concat demuxer reads a text script listing files and directives, then demuxes the inputs sequentially. The concat filter joins streams and is recommended by the FFmpeg FAQ when re-encoding is needed. The concat protocol performs file-level concatenation for supported formats. Confirm which method your command uses before applying concat-demuxer advice such as -safe.
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The concat demuxer expects the listed files to have the same streams, including codecs and time bases. Its script uses file path entries. Spaces and special characters in a path need correct escaping or single quotes. If you use the optional ffconcat version 1.0 signature for automatic script recognition, it must appear exactly on the first line. See the FFmpeg concat demuxer documentation and the FFmpeg concatenation FAQ.
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FFmpeg documents EACCES as “Permission denied”; Linux error code 13 is the corresponding access-denied identifier. That tells you the process could not access something, but not whether it was the playlist itself, one of the listed videos, or a directory needed to reach either file. The full error log, command, and paths are needed to identify the inaccessible object. See FFmpeg’s errno list and the Linux errno reference.
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Linux access depends on the identity running the process and access along the full path—not just the permissions on the video file. A command that succeeds in your interactive shell may fail when launched by a service, scheduled job, media application, or container running as another user.
Diagnose the failure in order
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Check the execution identity
Run diagnostics in the same context as the failing FFmpeg job. In an interactive shell,
idshows your current user and groups; for a service, inspect its process or service configuration to determine which account runs FFmpeg. Do not assume your terminal user is the service user.Rank #2
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Read the playlist entries literally
Open the concat script and check every
fileentry for spelling, relative versus absolute paths, whitespace, quoting, and escaping. Work out what each relative path resolves to from the command’s working directory, and confirm it points to the intended video. Check whether a component begins with a dot, since that can matter to concat safe-path validation.Recommended Free Tools
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Inspect access to the playlist, videos, and parent directories
As the FFmpeg execution account, inspect ownership and mode with
ls -l, and inspect every component of a path withnamei -l /path/to/video.mp4. Use the actual path to the playlist as well as to each listed video. If the system uses ACLs, inspect those too. These commands help locate an access gap; they do not determine its cause without your host’s output.Rank #3
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Grant only the access that is missing
If the FFmpeg account lacks the required read access, grant it to that account or an appropriate group, or move the media to a directory that account can traverse and read. Avoid blanket recursive permissions such as making files world-writable: they can expose or alter more than the job needs and may leave the actual directory-access problem unresolved.
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Retest a single video, then the playlist
Try opening one listed video with FFmpeg under the same execution identity. If that fails too, continue checking the file and directory access for that path. If the single file works but the playlist fails, focus on the script’s syntax, path resolution, and any safe-path rejection.
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If FFmpeg says “Unsafe file name”
The concat demuxer’s safe option is a separate validation check, not an operating-system permission grant. Its documented default is safe=1. In that mode, it rejects paths with a protocol specification, paths that are not relative, characters outside its documented portable set, and path components beginning with a period. The documentation says safe=0 permits any filename.
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For a playlist you trust, you can consider disabling that check by placing -safe 0 before the relevant concat input, for example:
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ffmpeg -f concat -safe 0 -i playlist.txt -c copy output.mp4
This example assumes a concat-demuxer script named playlist.txt; it does not repair unreadable files or directories. Use -safe 0 only with trusted playlist input, because it allows paths the default validation would reject. Consult the concat demuxer documentation for the installed build’s behavior.
Common symptoms and fixes
| Symptom | Likely area to check | Next action |
|---|---|---|
Permission denied on a file path |
The FFmpeg process may not be able to read that file, or traverse a parent directory. | Check the execution account and inspect the file and every directory in its path. |
| The playlist cannot be opened | The script path may be wrong or inaccessible to the execution account. | Check the command’s input path, working-directory assumptions, and playlist access. |
Unsafe file name |
Concat demuxer safe-path validation, not necessarily Linux permissions. | Review the relative-path and character rules; consider -safe 0 only for trusted input. |
| A video opens by itself but the playlist fails | Script syntax, path resolution, or safe-path behavior. | Check each entry’s quoting, escaping, resolved path, and compatibility with the other listed streams. |
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