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To repeat an MP4 while FFmpeg streams it to YouTube Live, use -stream_loop -1 before the input’s -i option, and use -re to read the file at its normal playback rate. Then send the output to the YouTube server URL with your stream key. The example below is for 30 fps H.264 video with AAC audio; adjust its bitrate and keyframe interval to match your actual resolution and frame rate.
Start with this FFmpeg command
ffmpeg -stream_loop -1 -re -i input.mp4
-c:v libx264 -preset veryfast -b:v 4500k -maxrate 4500k -bufsize 9000k
-g 60 -keyint_min 60 -sc_threshold 0
-c:a aac -b:a 128k -ar 44100
-f flv "rtmp://a.rtmp.youtube.com/live2/YOUR_STREAM_KEY"Replace input.mp4 with the file path and replace the example output destination with the server URL and stream key shown for your encoder stream in YouTube Live Control Room. Use the exact RTMPS endpoint provided by YouTube when one is available; YouTube recommends RTMPS. Treat the key like a password and do not post it or include it in shared logs.
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This is an illustrative command, not a tested universal preset. It assumes a 30 fps source: a GOP of 60 frames targets a two-second keyframe interval at that frame rate. Select the bitrate and GOP for the resolution and frame rate you actually send. A source with unusual audio, video, pixel format, or timestamps may need different options.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhat the loop options do
-stream_loop -1asks FFmpeg to repeat the input indefinitely. Place it before the matching-i; it applies to that input.-rereads a file at its native rate instead of sending it as fast as the machine can process it. This makes the file behave like a real-time feed. FFmpeg cautions against using it on an actual live input.-f flvselects the output container commonly used for RTMP/RTMPS publishing.
Prepare YouTube Live and start the stream
- Check channel eligibility. YouTube says a channel must be verified and must not have had live-streaming restrictions in the past 90 days. Confirm the current requirements in YouTube’s live-streaming setup guidance.
- Create or select an encoder stream. In YouTube Studio’s Live Control Room, create or choose the stream and copy its server URL and stream key. Follow YouTube’s encoder setup instructions for the current workflow and settings.
- Check the command destination. Put the server URL and key into the output destination in the form your encoder expects. The sample combines an RTMP server path and key; do not assume that exact endpoint is right for your account or RTMPS stream.
- Run FFmpeg and inspect the preview. For a scheduled stream, wait for the encoder preview in Live Control Room and choose Go live when required. Whether YouTube starts automatically depends on the stream settings.
- Monitor the broadcast. Check stream health, warning messages, video, and audio in Live Control Room. Test with representative movement and sound before relying on a long broadcast.
- End deliberately. Stop FFmpeg and end the broadcast in the control room as applicable. YouTube says streams under 12 hours are automatically archived; this is not a guarantee for streams lasting 12 hours or longer.
Choose encoder settings for your actual stream
YouTube’s current encoder guidance supports H.264, H.265/HEVC, and AV1 video with AAC or MP3 audio over RTMP/RTMPS, at frame rates up to 60 fps. The command above uses H.264 and AAC as a broadly compatible example, not because they are the only accepted formats. YouTube recommends constant bitrate (CBR) and a two-second keyframe interval, not exceeding four seconds. Its advanced recommendations include square pixels, progressive scan, two B-frames, one reference frame, and Rec. 709 for SDR.
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| Example output | YouTube H.264 bitrate recommendation |
|---|---|
| 720p at 30 fps | 8 Mbps |
| 1080p at 30 fps | 10 Mbps |
| 1080p at 60 fps | 17 Mbps |
| Stereo audio | 128 Kbps |
These are YouTube recommendations in its current guidance, accessed in 2026—not guarantees of stream quality. Match the row to your resolution and frame rate, and choose a bitrate your reliable upload connection can sustain. The sample’s 4,500 Kbps video setting is therefore an illustrative value, not the recommended setting for every format. See YouTube’s encoder settings and bitrate table for the applicable codec and resolution.
Decide whether to stream-copy or re-encode
The sample re-encodes video as H.264 and audio as AAC. Re-encoding uses processing power, but lets you set a consistent target bitrate and keyframe interval. If the input is compatible, you can experiment with -c copy to avoid re-encoding. Stream copy does not normalize incompatible codecs, stream layouts, or timestamps, and it does not guarantee a clean repeat point. If publishing fails or playback breaks at the loop boundary, inspect FFmpeg’s error output and test a re-encoded baseline.
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Check the MP4 and the loop transition
An infinite input loop does not by itself guarantee a seamless transition or a valid continuous stream. Test the actual file and broadcast before leaving it unattended: listen for audio gaps or abrupt changes, watch the picture at the repeat point, and monitor YouTube’s stream health. A source’s codecs, stream layout, and timestamps can affect whether looping works cleanly with a particular FFmpeg build.
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Or let it run in the cloud
If your goal is to keep a prerecorded video looping on YouTube without maintaining your own FFmpeg process, StreamNeo runs the stream from the cloud: upload a recording or make a playlist, add your YouTube stream key, and go live. Your computer and home connection do not have to stay on. It supports whatever quality you upload, up to 4K 60fps, at one price per slot; it automatically recovers if YouTube drops the stream. The first day is free with no card. Monthly: $9.99 per month. Start the free first day with StreamNeo.
Frequently Asked Questions
Can I use the loop command with more than one input?
The option applies to the input whose -i it precedes. The command here is for one MP4; combining multiple files requires a separate playlist or concatenation workflow.
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Will the YouTube archive also loop forever?
No. The encoder sends repeated playback while the stream is running; YouTube’s stated automatic-archive rule applies to streams under 12 hours.
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