Use FFmpeg’s concat demuxer to play an explicit, ordered playlist of video files, loop it, and send the output to a YouTube Live event. This works most simply when the files have matching streams, codecs and time bases; mixed files may need normalization or re-encoding. The steps below show how to prepare the playlist, configure YouTube and FFmpeg, and diagnose common failures.
Before you start
- Install an FFmpeg build that includes the demuxers and encoders you need. The exact command can vary with your operating system, shell and FFmpeg build.
- Prepare the video files and decide their playback order. A named playlist is more reliable than assuming a folder will be read in a particular order.
- Create or select a YouTube Live event and keep its stream URL and stream key private.
- Use a stable internet connection with enough upload capacity for the selected output bitrate.
- Confirm you have the rights to stream every video and audio track. A technically successful stream does not grant permission to use copyrighted material.
The command below is a template, not a tested, universally portable command. Replace its placeholders, check option placement against your installed FFmpeg version, and test with your own files before relying on it unattended.
Build an ordered playlist
Create a plain-text file named playlist.txt and add one file line per video, in the order you want them played. For example:
file '/path/to/videos/first video.mp4'
file '/path/to/videos/second video.mp4'
file '/path/to/videos/third video.mp4'Use paths appropriate to your operating system. Spaces and special characters need correct quoting or escaping for the concat script and your shell. FFmpeg’s concat demuxer defaults to safe=1, which rejects paths it considers unsafe. Keep that protection where possible; disable it only for a playlist you trust and only if needed. See the FFmpeg concat demuxer documentation.
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Check whether the videos can be concatenated directly
The concat demuxer joins files as a virtual input; it does not make incompatible media compatible. FFmpeg requires the files to have the same streams, codecs and time bases for this method. A folder containing a mix of frame rates, codecs, resolutions or audio layouts may not work correctly with stream copy.
- If the files match: stream copy may avoid a decode-and-re-encode step, but test transitions and audio before using the playlist continuously.
- If the files differ: normalize them to compatible properties before using the demuxer, or use FFmpeg’s concat filter and re-encode. The filter is the appropriate route when re-encoding is needed; see the FFmpeg FAQ on concatenating video files.
- If durations or stream lengths are inaccurate or unequal: timestamps may produce artifacts or gaps at transitions. Check the source files and inspect the output during a representative test.
Create a YouTube Live event and retrieve its ingest details
- Open YouTube Studio and go to the Live Control Room. Create or select the event you intend to use.
- Copy the event’s current stream URL and stream key/name from YouTube’s live-stream configuration. Do not reuse an endpoint copied from an old tutorial.
- Treat the stream key as a password. Do not publish it in a command example, share it in a screenshot, or leave it in logs or files others can access. If it is exposed, replace it in YouTube’s controls.
- Use RTMPS when available. YouTube recommends RTMPS for encrypted transport. The Live Streaming API describes the stream URL and stream name as separate values or as a combined
STREAM_URL/STREAM_NAMEvalue: YouTube Live Streaming API: LiveStreams.
Set output options and start the loop
Use the following as a command outline only. Substitute your playlist path, encoder settings and the RTMPS URL and stream name supplied for your event. The exact syntax, quoting and placement of options can depend on your shell, FFmpeg build and input files.
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ffmpeg -re -stream_loop -1 -f concat -safe 1 -i "/path/to/playlist.txt"
-f flv "[RTMPS_URL]/[STREAM_NAME]"-stream_loop -1 requests an indefinite input loop, and -f concat selects the concat demuxer. -re is a pacing option for file inputs so FFmpeg reads at real-time speed rather than sending the files as fast as it can. The encoding options must produce a format and bitrate appropriate to your sources and YouTube’s current guidance. -f flv is used here for the RTMP(S) output path. Do not paste a real stream key into a public article, shared script or support request.
This continuous FFmpeg process does not guarantee that YouTube will keep a live event available indefinitely. Watch the Live Control Room for stream health, status and messages, and handle any event-side limits or interruptions there.
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Choose encoder settings using YouTube’s guidance
YouTube’s current encoder guidance supports RTMP/RTMPS ingest and lists H.264, H.265 and AV1 video, with AAC or MP3 audio. It recommends constant bitrate (CBR), frame rates up to 60 fps, and a two-second keyframe interval that should not exceed four seconds. Bitrate guidance varies by codec, resolution and frame rate; for H.264 at 1080p30, YouTube’s table recommends 10 Mbps. That is a recommendation for that configuration, not a universal minimum. Check YouTube’s current table before choosing settings: Choose live encoder settings, bitrates, and resolutions.
- Choose a resolution and frame rate that your source material and encoder can sustain.
- Set the video encoder’s keyframe interval to two seconds where possible, and keep it at four seconds or less.
- Use CBR and select a bitrate based on the codec, resolution and frame rate rather than copying a number intended for another configuration.
- Make sure your sustained upload capacity can support the output bitrate reliably; leave capacity for normal network variation.
- Test representative footage with motion and audio, then inspect YouTube’s stream-health messages before leaving the process unattended.
RTMP(S) or HLS?
The command outline above uses the RTMP(S) path. HLS is a separate ingest workflow, not a drop-in replacement for the output URL in that command. YouTube’s HLS setup requires HTTPS POST/PUT requests, MPEG-TS segments and a rolling playlist with no more than five outstanding segments; segment duration must be between one and four seconds. YouTube notes that HLS has higher latency than RTMP because it sends segments rather than one continuous stream. Use HLS only when you deliberately implement that workflow and its requirements: Set up an HLS stream.
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Troubleshoot common problems
The playlist will not open
- Check that the playlist path passed to
-iis correct and that FFmpeg can read it. - Check each
fileline for correct quoting, escaping and file paths. - If FFmpeg rejects a path as unsafe, do not disable
safeby default. Verify that the playlist and every referenced path are trusted; only then consider whether the safe-path restriction is the issue.
Playback breaks or looks wrong at a file boundary
Check the files’ stream layouts, codecs and time bases. The demuxer expects them to match. If they do not, normalize the files or use the concat filter with re-encoding. Also check for inaccurate duration metadata or audio/video streams of unequal length, which can cause timestamp artifacts or gaps.
YouTube does not receive the stream
- Verify that the event is active and that the current stream URL and stream key/name are correct.
- Check that you selected RTMP(S) output for the RTMP(S) endpoint and have not substituted an HLS endpoint or configuration.
- Read FFmpeg’s connection errors and YouTube’s Live Control Room status. Keep the key private while troubleshooting.
YouTube reports poor stream health
Check the selected bitrate against YouTube’s guidance for your codec, resolution and frame rate, then check that your connection can sustain it. Test representative audio and movement and follow the specific health messages in the Live Control Room.
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The stream stops after an interruption
FFmpeg looping the input does not by itself guarantee recovery from every network, process or YouTube-side interruption. Monitor the process and YouTube status, and restart or reconnect according to the error shown. Do not treat continuous local output as proof that the platform-side event remains live.
Copyright and channel considerations
Only stream material you own or are authorized to use, including music and other audio. A playlist that runs continuously does not change the rights status of its contents. YouTube may also evaluate a channel under its applicable monetization and content policies; technical continuity alone does not establish eligibility. Review YouTube’s current rules for your channel and the material you plan to broadcast.
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