To loop a local playlist indefinitely in FFmpeg, use -stream_loop -1 before the input it applies to. The command below uses FFmpeg’s concat demuxer with a text file list; it is not a universal command for every file named .m3u. A local music playlist is also different from YouTube’s HLS ingestion format.
Build a playlist FFmpeg can read
First identify the playlist format. The example below expects a concat-demuxer file list, typically a text file such as playlist.txt, with entries in the format the concat demuxer accepts. Do not assume an arbitrary M3U file can be passed to -f concat: the extension alone does not establish which playlist dialect it uses.
For example, a concat list commonly has one file line per media file:
file '/path/to/track 1.mp3'
file '/path/to/track 2.mp3'Check the concat-demuxer documentation for the syntax supported by your installed FFmpeg build, especially if paths contain quotes or other special characters. Confirm that FFmpeg can open every referenced file and that the files’ codecs and timestamps can transition cleanly. If your source is an M3U, determine its dialect and entry types first; the guidance here does not establish compatibility with every M3U.
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Start the loop and send it to YouTube
Use this as a command shape, not a tested, copy-and-run command. Replace the ingest destination with the RTMPS URL and stream key shown in YouTube Live Control Room. Keep the key private, including in scripts, terminal history, and logs.
ffmpeg -re -stream_loop -1 -f concat -safe 0 -i playlist.txt
-c:v libx264 -c:a aac -f flv "rtmps://YOUR_YOUTUBE_INGEST/YOUR_STREAM_KEY"- Check the input. The command assumes
playlist.txtuses concat-demuxer syntax and that its paths resolve from the FFmpeg process’s working environment. Quote paths according to that list format. - Keep the loop option before its input.
-stream_loopis an input option. The value-1requests infinite looping;0means no looping. Put it before the relevant-i, as shown. See the FFmpeg documentation. - Read file input in real time.
-repaces file input rather than sending it as fast as possible. FFmpeg’s RTMP example likewise uses real-time pacing, H.264 video, AAC audio, and FLV output. Check that your installed build supports the selected encoders and muxer in the FFmpeg documentation. - Provide video if your setup needs it. This command presumes a video stream is available. For a radio-style stream without video, add a suitable video input, such as a static image, and explicitly map the audio and video streams. Do not assume audio-only input will be accepted in your particular YouTube workflow; verify it there.
- Use YouTube’s current ingest details. Copy the RTMPS ingest endpoint and stream key from Live Control Room rather than using the example text. YouTube recommends RTMPS for the ordinary RTMP-family ingest path.
Set encoding to match YouTube’s guidance
YouTube’s encoder guidance, checked October 3, 2026, lists H.264 video and AAC or MP3 audio for its RTMP/RTMPS workflow. It recommends constant bitrate (CBR) and a two-second keyframe interval, with keyframes no more than four seconds apart. Its advanced audio guidance specifies stereo, 44.1 kHz, 128 kbps. These are platform recommendations and guidance, not a guarantee that any particular source file or connection will work.
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The example selects H.264 and AAC but does not set a bitrate, resolution, frame rate, keyframe interval, or audio rate. Choose those values for the intended stream and available upload connection, then check YouTube’s current encoder guidance for the appropriate resolution and bitrate. YouTube transcodes live input for viewer formats; test with representative audio and video and watch stream health in Live Control Room.
Do not confuse a local M3U with YouTube HLS ingestion
A local playlist tells FFmpeg what media to read. YouTube’s HLS option is a separate ingestion protocol for HLS-capable encoders; an .m3u filename by itself does not make a local playlist an HLS media playlist.
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YouTube’s HLS instructions, checked October 3, 2026, specify 1–4 second segments, TS segment format, a rolling playlist with no more than five outstanding segments, HTTPS POST/PUT, and no byte ranges. YouTube notes that HLS has higher latency because it sends segments rather than a continuous stream. These requirements apply when implementing HLS ingestion, not to a local music playlist passed to FFmpeg. See YouTube’s HLS ingestion instructions.
Test before relying on a 24/7 stream
- Run a short private or unlisted test using representative media.
- Check that playback advances across a playlist-entry boundary and that audio continues without an unintended gap or failure.
- Confirm YouTube receives video if your chosen setup requires it, and check the stream-health indicators in Live Control Room.
- Verify that every file is readable by the FFmpeg process and that the playlist paths still work in the environment where the command will run.
- Confirm the loop repeats by observing more than one pass through the list. A successful first track does not verify the transition or loop.
YouTube recommends testing before going live. A looping command does not itself establish that you have rights to stream every track, that a particular channel is eligible for every live feature, or that a connection will remain uninterrupted. Check the rights and current account requirements that apply to your use.
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Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| The playlist is rejected or files are not found. | The file is not in concat-demuxer format, an entry path is wrong, or the FFmpeg process cannot access it. | Verify the list syntax, working directory, path quoting, and permissions. Confirm the installed FFmpeg build and demuxer support. |
| The list plays once and stops. | -stream_loop -1 is missing, has the wrong value, or is positioned after the input it should affect. |
Place -stream_loop -1 before the relevant -i. |
| Playback fails or glitches at a track boundary. | Successive files may have incompatible codecs, timestamps, or other properties for a clean transition. | Test transitions individually and use media with compatible properties or prepare the files consistently before streaming. |
| YouTube does not receive the stream. | The endpoint or stream key may be incorrect, the key may have been exposed or changed, or the encoder settings may not fit the ingest workflow. | Copy the current RTMPS destination and key from Live Control Room, protect the key, and check YouTube’s encoder guidance and stream-health status. |
| There is audio but no picture, or the ingest is rejected. | The input may not contain video, or the chosen account/workflow may not accept the audio-only arrangement. | Add and map a suitable video input if needed; verify behavior in a private or unlisted test rather than assuming audio-only acceptance. |
| The stream stops during a temporary network failure. | The connection dropped and the process did not recover successfully. | FFmpeg documents FIFO options that attempt recovery after temporary network failure. Configure and test recovery for your environment, then monitor whether reconnection actually succeeds; it cannot guarantee uninterrupted service. |
| An M3U works locally but not as YouTube HLS input. | A local media list is being treated as the separate HLS ingestion protocol. | For HLS ingestion, implement YouTube’s segment, rolling-playlist, transport, and HTTPS requirements; the file extension alone is not enough. |
For FFmpeg’s input and protocol options, consult its documentation. YouTube’s current RTMP/RTMPS encoder recommendations are in YouTube Help.
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