You can loop a sequence of MP4 files into a continuous YouTube Live stream with FFmpeg: create a concat-demuxer playlist, configure a broadcast and stream key in YouTube Studio, then send compatible video and audio to YouTube over RTMPS. This is a continuously delivered encoder feed—not a normal video upload—and it still needs monitoring for stream-health problems, file errors, and interruptions.
What you need before you start
- A YouTube account with Live streaming available and a broadcast configured in YouTube Studio’s Live Control Room. A working FFmpeg command does not enable Live access or create the broadcast for you.
- FFmpeg installed on a computer or server that can stay on and maintain a reliable internet connection for the duration of the stream.
- MP4 files you have the necessary rights to stream. Technical compatibility does not establish permission to use music, game audio, or other copyrighted material.
- A private stream key from YouTube. Treat it like a password: do not put it in a public repository, screenshot, or shared command log.
YouTube separates the broadcast from the incoming stream: the broadcast is the live event, while the stream is the encoder feed associated with it. See Google’s explanation of broadcasts and streams.
Prepare a compatible MP4 playlist
Check the files first
The concat demuxer presents files in sequence without decoding and rebuilding them. For that to work reliably, the files need compatible stream layouts, codecs, and time bases. Check that their video and audio streams, dimensions, frame rates, pixel formats, and audio sample rates also match. If they differ, normalize them before using the demuxer, or use FFmpeg’s concat filter and re-encode to a consistent output. Re-encoding costs more CPU but is generally the more suitable route for heterogeneous sources.
Create the playlist file
Make a plain-text file called playlist.ffconcat. The signature must be the first line, exactly as shown:
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ffconcat version 1.0
file '/media/radio/track-001.mp4'
file '/media/radio/track-002.mp4'
file '/media/radio/track-003.mp4'Replace the example paths with your own, keeping one file directive per entry. Quote or escape paths containing spaces or special characters. By default, the concat demuxer’s safe-path check rejects some absolute or otherwise unsafe paths. Prefer relative paths where practical; use -safe 0 only if you trust the playlist and need paths the default check would reject. The FFmpeg concat demuxer documentation describes the format and its restrictions.
Do not assume the transitions will be gapless. The demuxer advances timestamps using each file’s duration; unequal stream lengths can create gaps, and inaccurate duration metadata can cause artifacts. Play through a full cycle before relying on the playlist.
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Set up the YouTube broadcast and ingest
- Open YouTube Studio and go to Create > Go live to enter Live Control Room.
- Create or select the broadcast you want the encoder to feed. Check that Live streaming is available for your account and that the broadcast is in the correct state.
- In the encoder settings, copy the current stream URL and stream key shown by YouTube. Choose RTMPS when it is available, and use the exact endpoint YouTube provides; ingest URLs can vary.
- Keep the key private. Avoid saving it in a public script or sharing terminal output that exposes it.
YouTube recommends RTMPS, which carries RTMP over an SSL connection. Its encoder-settings guidance covers supported formats, bitrate recommendations, keyframes, testing, and stream health. RTMPS is the typical choice for this workflow. YouTube also documents HLS ingestion as an alternative for compatible encoders and use cases such as HDR or codecs unavailable over RTMP; HLS sends video in segments and has higher latency. It requires the HLS-specific configuration, not merely changing an RTMPS command’s output label. See YouTube’s HLS setup guide.
Run FFmpeg and loop the playlist
For a homogeneous playlist, this command is an illustrative starting point, not a universal tested configuration:
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ffmpeg -re -stream_loop -1 -f concat -safe 0 -i playlist.ffconcat
-c:v libx264 -preset veryfast -pix_fmt yuv420p
-b:v 4500k -maxrate 4500k -bufsize 9000k -g 60
-c:a aac -b:a 128k -ar 44100
-f flv 'rtmps://YOUR_CURRENT_INGEST_URL/YOUR_STREAM_KEY'Replace the endpoint with the current RTMPS URL and stream key from Live Control Room. Do not share the command with a real key embedded in it.
-rereads the media at real-time pace, which is appropriate when sending prerecorded files as a live feed.-stream_loop -1asks FFmpeg to repeat the input indefinitely. Input options belong before the corresponding-i.-f concat -safe 0 -i playlist.ffconcatselects the concat demuxer and reads the playlist. Omit-safe 0if your playlist works with the default safety check.-c:v libx264and-c:a aacencode H.264 video and AAC audio, formats in YouTube’s encoder guidance. This example re-encodes rather than copying the compressed streams.-b:v,-maxrate, and-bufsizeset the example’s video-rate controls;-b:a 128ksets AAC audio bitrate;-ar 44100sets a 44.1 kHz sample rate.-g 60sets a 60-frame GOP. At 30 fps that is approximately a two-second keyframe interval; use a value matched to your chosen frame rate.-f flvselects the output container used for this RTMPS encoder output.
Choose output settings for your actual media
YouTube recommends CBR and a keyframe interval of two seconds, not exceeding four seconds. The example’s -g 60 is not right for every frame rate: for 60 fps, for example, a 60-frame GOP is about one second. Set the GOP to match the selected frame rate and interval.
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Do not copy the example’s 4.5 Mbps video bitrate without checking YouTube’s current table for your resolution and frame rate. The 128 kbps AAC value is YouTube’s listed stereo audio bitrate; 44.1 kHz is the example’s stereo sample rate. YouTube also lists 48 kHz for 5.1 audio, so do not assume the example’s audio settings suit surround sound. Test representative motion and audio, and ensure your dependable upload capacity has headroom above the target video and audio bitrates plus protocol overhead. The installed FFmpeg version and build can affect option availability or behavior, so check its manual if an option is rejected.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test the stream before leaving it unattended
- Start with a private or unlisted test broadcast and representative video motion and audio. YouTube’s guidance says, “Make sure to test before you start your live stream.”
- While FFmpeg runs, watch Live Control Room’s stream-health messages and confirm YouTube is receiving the encoder feed.
- Let the playlist complete a full cycle. Check the wrap to the first file, audio continuity, image changes, and whether a damaged or missing file stops output.
- For ongoing operation, run FFmpeg under a process supervisor or service manager with restart behavior configured. Keep logs somewhere persistent, alert on process exit or ingest loss, and assign a person to check stream health.
A supervisor can restart a failed process, but it cannot guarantee a continuous YouTube broadcast. Keep a human monitoring the stream, particularly after playlist or configuration changes.
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Troubleshooting common failures
| Symptom | Likely cause | What to check or do |
|---|---|---|
| FFmpeg rejects a playlist path | The concat demuxer’s default safe-path check rejects an absolute or otherwise unsafe path, or the playlist syntax is malformed. | Check that ffconcat version 1.0 is the exact first line and paths are quoted or escaped correctly. Prefer relative paths; use -safe 0 only for a playlist you trust. |
| Playlist will not open or a file is skipped | A path is wrong, the file is inaccessible, or the playlist entry is invalid. | Verify each path from the FFmpeg process’s working environment and confirm the file can be read. Keep one valid file directive per entry. |
| Concat reports stream mismatch or output behaves badly at transitions | Files have different codecs, stream layouts, time bases, or other incompatible properties. | Inspect and normalize the media to a common format, or switch to a concat-filter workflow that re-encodes. Test transitions after changing files. |
| Gaps or artifacts appear between items | Stream lengths differ or duration metadata is inaccurate. | Check the source durations and stream lengths, then watch a full playlist cycle. The demuxer uses durations to set following timestamps. |
| YouTube reports a weak or unstable stream | Upload capacity may not reliably sustain the selected bitrate, or encoder settings may not match YouTube’s recommendations. | Check Live Control Room stream health, test upload capacity, leave headroom above combined video and audio bitrate, and choose settings from YouTube’s current encoder table. |
| YouTube is not receiving the feed | The broadcast may not be ready, Live access may not be enabled, or the ingest URL or key may be wrong. | Check the broadcast state and current encoder settings in Live Control Room. Replace the endpoint and key with the values shown there; do not assume FFmpeg creates or activates the broadcast. |
| FFmpeg stops and the stream ends | The process exited, a source failed, or the host or connection was interrupted. | Review persistent FFmpeg logs, verify the source files and connection, and configure a supervisor to restart the encoder. Confirm the ingest recovers and assign someone to monitor it. |
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The monthly option is $9.99 per month. It includes one always-on stream, 10 GB storage per slot pooled across active slots, looping and playlists, automatic recovery if YouTube drops, and StreamNeo team support. UPI and cards are accepted in India; card checkout is available worldwide. For five or more slots, contact support.
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