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Use this FFmpeg command pattern
For a local playlist assembled with FFmpeg’s concat demuxer, this is an illustrative starting pattern. It has not been tested as a universal command: replace the ingest URL and key with the values from YouTube Live Control Room, and select encoding settings appropriate to your video.
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ffmpeg -re -stream_loop -1 -f concat -safe 0 -i playlist.txt
-c:v libx264 -preset veryfast -b:v 5M -maxrate 5M -bufsize 10M
-g 60 -c:a aac -b:a 128k -f flv 'rtmps://YOUR_YOUTUBE_INGEST_URL/YOUR_STREAM_KEY'The two options immediately before the input do different jobs: -stream_loop -1 repeats that input without a set limit, while -re paces local-file reading at its native rate for real-time output. FFmpeg documents -stream_loop as an input option, so it must appear before the -i it applies to. FFmpeg’s command-line documentation explains option placement and looping; its main options documentation describes real-time input pacing.
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The example’s encoding values are not a recommendation for every resolution or frame rate. In particular, -g 60 corresponds to a two-second keyframe interval only at 30 fps. Set the GOP/keyframe interval for your output frame rate and YouTube’s current guidance.
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Build a compatible playlist
Create the concat file
Save a plain-text file such as playlist.txt with one file entry per line:
file '/absolute/path/clip-01.mp4'
file '/absolute/path/clip-02.mp4'
file '/absolute/path/clip-03.mp4'Use paths readable by the account running FFmpeg. The command’s -safe 0 permits paths that the concat demuxer’s default safety rules may reject. Use it only when the playlist and every referenced path are trusted.
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Check media compatibility first
The concat demuxer expects corresponding streams to match, including stream layout, codecs, and time bases. A playlist whose clips differ in resolution, aspect ratio, audio streams, or codec may fail at a boundary or produce an interrupted or inconsistent output. See FFmpeg’s concat demuxer documentation. Normalize a static playlist to consistent stream properties before concatenating when needed; this is practical guidance, not a guarantee that every source file can be made seamless with one command.
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- Prepare the YouTube event. In YouTube Studio, open Live Control Room and create or select the stream/event. Follow YouTube’s encoder setup instructions to obtain its stream URL and stream key.
- Insert the connection details. Replace the example RTMPS destination with the ingest URL and key provided for your stream. Treat the key like a password: anyone who obtains it may be able to broadcast to your event. If you reset the key, update the FFmpeg destination too.
- Choose compatible output settings. YouTube’s live encoder settings list supported video/audio formats and bitrate guidance by codec, resolution, and frame rate. YouTube’s current table gives H.264 at 1080p/30 fps a minimum of 5 Mbps and a recommended 14 Mbps; those are platform ingest recommendations, not performance guarantees. YouTube recommends a two-second keyframe interval and says not to exceed four seconds. It recommends constant bitrate encoding, supports H.264, H.265, or AV1 video for RTMP/RTMPS, and AAC or MP3 audio.
- Start and verify the broadcast. Run the command, then check the Live Control Room preview and stream health before relying on the stream. Test representative motion and audio, and monitor health while it runs, as YouTube advises in its encoder guidance.
Use RTMPS where available; YouTube recommends it for encrypted transport. Recheck YouTube’s encoder table when setting up a new stream because its supported settings and recommendations may change.
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Know what “indefinitely” means here
-stream_loop -1 repeats FFmpeg’s input; it does not restart FFmpeg after a crash, restore a lost network connection, or control YouTube’s event. Those are separate failure points. YouTube’s encoder setup guidance says streams shorter than 12 hours are automatically archived. That does not mean a single YouTube archive can be assumed to cover an unlimited broadcast, even if the local playlist keeps repeating.
Troubleshoot common failures
- The playlist stops after one pass: Put
-stream_loop -1before the relevant-i. It is an input option; after the input, it will not apply to it. FFmpeg option documentation. - The playlist rushes through the files: For local media, add
-rebefore the input to pace reading at normal speed. It does not create the loop. Do not casually apply it to actual capture devices or live inputs; FFmpeg cautions that doing so can cause packet loss. FFmpeg real-time input guidance. - FFmpeg fails or the output breaks at a clip boundary: Inspect the concat inputs for matching stream layouts, codecs, and time bases. Normalize incompatible clips to consistent properties before concatenation. Concat demuxer documentation.
- YouTube reports an ingest or format problem: Check the destination URL/key, RTMP/RTMPS protocol, selected codec, bitrate for the actual resolution and frame rate, constant-bitrate setting, audio codec, and keyframe interval against YouTube’s current encoder settings.
- The broadcast stops although the input is looping: Check whether FFmpeg exited, the network dropped, or the YouTube event was stopped or ended. Input looping only repeats media inside a running process; it does not provide process supervision, network recovery, or an unlimited YouTube archive. YouTube’s encoder setup guidance.
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