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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11To rotate videos stored across several folders, generate a text playlist that lists each file in the order you want, then pass that playlist to FFmpeg’s concat demuxer. This works best when every file has matching stream layouts, codecs, and time bases. If they differ and you can re-encode, use the concat filter workflow instead. The playlist is a fixed sequence: it does not, by itself, watch folders for new files.
Choose the right FFmpeg concatenation method
FFmpeg’s concat demuxer reads a sequence of files and adjusts their timestamps so each follows the previous one. It is the straightforward option for a fixed playlist when the inputs are compatible. See the FFmpeg concat demuxer documentation and the FFmpeg FAQ on concatenating video files for the method’s requirements and alternatives.
- Use the concat demuxer to play listed files in sequence without a re-encode, provided their streams, codecs, and time bases match.
- Use the concat filter when you need to re-encode or normalize inputs that do not match. The filter workflow is more involved because it processes media streams rather than simply reading a compatible file list.
- Do not assume folder rotation is automatic. The demuxer reads the paths in the playlist; scanning folders, choosing files, and setting their order are separate tasks.
FFmpeg’s documentation warns that concat demuxer inputs must have the same streams, including codecs and time bases. Stream-length mismatches can also introduce gaps. A 2024 FFmpeg-user mailing-list reply about files with varied formats, dimensions, and aspect ratios recommends transcoding to consistent properties before concatenating; treat that as practical community advice, not a guarantee for every file set or build. See the January 2024 mailing-list discussion.
Build a playlist from multiple folders
Create a plain-text concat list with one file directive per video. Put the full path to each file in the order it should play. For example, this illustrates playlist syntax only; it is not a tested command or complete YouTube Live configuration:
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file '/media/folder-a/clip-01.mp4'
file '/media/folder-b/clip-02.mp4'
file '/media/folder-a/clip-03.mp4'- Decide the order. Choose alphabetical order, a shuffled sequence, or a schedule you define. A directory’s name or the concat demuxer does not determine your intended rotation.
- Enumerate the selected files. Scan the folders with a script or other file-management method, then write the chosen paths into the list. The concat demuxer does not scan directories for you.
- Save the list. Keep it in a location accessible to the FFmpeg process, and use path quoting appropriate to your operating system and FFmpeg version. Confirm how paths containing quotes or special characters should be escaped before using them.
- Check representative inputs. Verify that files have compatible streams, codecs, and time bases before relying on a long playlist. If they are heterogeneous, test a normalized, re-encoded set with the concat filter instead.
The playlist example above demonstrates only the list format. It does not specify a complete FFmpeg invocation, encoder settings, an RTMP destination, or a stream key.
Looping a fixed list is not the same as watching folders
A finite playlist can be repeated as a workflow choice, but repeating it does not discover videos added later. The concat documentation establishes sequential reading of the paths in a list; it does not establish a robust live-refresh mechanism for edits to that list or a directory watcher. If your playlist changes, do not assume a running FFmpeg process will pick up the change seamlessly. Plan to regenerate the list and restart or otherwise manage the process, then test the behavior with your exact FFmpeg build and files.
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Connect FFmpeg to YouTube Live carefully
The concat setup determines which media FFmpeg reads; it does not establish the current YouTube ingest address, stream-key procedure, or recommended output settings. Before building a production command, check YouTube’s current official live-streaming instructions and the requirements shown for your own event. Confirm the output against your FFmpeg build, source streams, and destination settings rather than copying an unverified RTMP command.
- Keep the stream key private; treat it as a credential and do not publish it in scripts, screenshots, or logs that others can access.
- Test the complete chain with representative files before scheduling a continuous broadcast, including audio, transitions between files, and the destination’s acceptance of the output.
- Use only material you have the rights to stream. A technically valid playlist does not establish permission to broadcast its contents, and YouTube’s current copyright and reused-content rules should be checked for the channel and content involved.
Troubleshoot common playlist problems
| Symptom | Likely cause | What to check |
|---|---|---|
| FFmpeg cannot open a listed file | The path is incorrect, inaccessible to the process, or quoted incorrectly for the operating system or build. | Check the exact path, permissions, playlist location, and escaping rules for paths with special characters. |
| Files fail to concatenate cleanly | Inputs may have different streams, codecs, or time bases, which the concat demuxer requires to match. | Inspect the files and test a representative sequence. If properties differ, normalize or transcode them and use the concat filter workflow. |
| There is a gap or an unexpected transition | Stream durations may not align, or source files may have differing media characteristics. | Review the source files around the transition and test the full sequence; the demuxer may introduce gaps when stream lengths do not align. |
| A newly added video does not play | The running process is reading its existing sequence rather than acting as a verified folder watcher. | Regenerate the playlist and use a tested restart or process-management approach; seamless live refresh is not established by the concat-list workflow. |
| YouTube does not accept the output | The destination configuration or output settings may not match current platform requirements. | Check YouTube’s current official instructions and the event’s ingest details, then validate the complete command with your FFmpeg version and stream key. |
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