To repeat a video while streaming to YouTube with FFmpeg, loop the media input, pace the file in real time with -re, and send the output to YouTube’s ingest URL with a protected stream key. These are separate jobs: looping keeps the video content repeating; an FFmpeg FIFO recovery wrapper can attempt to reconnect after some temporary output failures. Neither prevents every visible interruption if FFmpeg, your network, or YouTube’s ingest fails.
Choose how FFmpeg repeats the video
There are two useful approaches, depending on whether you need to repeat a whole file or a section of video. Choose the audio strategy separately: the loop video filter repeats frames, not an audiovisual program with synchronized sound.
Repeat the whole input file
For a file you want to replay from beginning to end, use FFmpeg’s input-loop option before the input:
ffmpeg -re -stream_loop -1 -i "video.mp4" ...-stream_loop -1 requests infinite input looping. This is a straightforward starting point when the file contains the video and audio you want to repeat together. Check the output at the loop boundary: source formats, timestamps, and audio tracks can affect how seamless the transition sounds or looks.
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Repeat buffered video frames
FFmpeg’s loop filter repeats buffered video frames. Its options include loop=-1 for infinite repetitions, size for the number of frames buffered, and start for the first frame. The filter applies to video only. It does not automatically loop, synchronize, or mix audio, so define an audio path separately and test the transition before going live.
See the FFmpeg filters documentation for the loop filter’s syntax and option details. The choice between whole-input looping and a frame-filter loop depends on the source, audio synchronization, and the boundary you want.
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Pace the file as a live source
When reading a file for live output, put -re before the relevant -i so FFmpeg reads at the input’s native frame rate rather than sending the file as fast as possible:
ffmpeg -re -stream_loop -1 -i "video.mp4" ...FFmpeg documents -re as equivalent to -readrate 1 and notes that it is useful when flow speed matters, such as streaming. Options generally apply to the next input or output, so placement matters. Do not apply low read rates to an actual live capture input; FFmpeg warns that doing so can cause packet loss. Consult the FFmpeg documentation for option scope and read-rate behavior.
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Match YouTube’s encoder settings
Use YouTube’s published encoder guidance for the codec, resolution, frame rate, and bitrate you actually plan to send. YouTube lists RTMP and RTMPS ingest, H.264, H.265, and AV1 video, AAC or MP3 audio, and frame rates up to 60 fps. Its guidance recommends constant bitrate (CBR), a two-second keyframe frequency, and says not to exceed four seconds. Pick the corresponding bitrate from YouTube’s table for your codec, resolution, and frame rate; the upload connection must be able to sustain it.
YouTube recommends RTMPS. Choose it where your FFmpeg build and destination support it; RTMP may be needed for compatibility with a particular setup. The protocol choice does not remove the need for a stable upload connection. See YouTube’s encoder settings, bitrate, and resolution guidance for its current values and supported combinations.
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Connect FFmpeg to your YouTube event
- Open YouTube Live Control Room. Create or open the live event and follow YouTube’s encoder setup workflow.
- Copy the server URL and stream key. Use the values shown for that event in your FFmpeg output configuration. Do not publish or share the key; treat it like a password. If you reset it in YouTube, update the FFmpeg configuration too.
- Set the output format and destination. Send an FLV output to the YouTube RTMP(S) server URL combined with your stream key, using the selected video and audio codecs and settings. The exact output options depend on your file, installed FFmpeg build, and YouTube’s selected ingest details.
- Check your local FFmpeg version and options. Run
ffmpeg -versionand consult that build’s help or documentation before relying on a particular option. Do not copy a real stream key into a public script, screenshot, or example.
YouTube’s encoder setup instructions explain how to connect an encoder to a live stream. Because the source format, audio tracks, FFmpeg build, and event settings vary, there is no single command that is correct for every file and account.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Attempt output recovery after temporary failures
Media looping does not keep the RTMP(S) connection healthy. To handle some temporary output failures, FFmpeg’s FIFO muxer documentation gives an RTMP example using recovery options:
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-f fifo -fifo_format flv -attempt_recovery 1 -recovery_wait_time 1 -drop_pkts_on_overflow 1In an output setup, these options tell the FIFO muxer to attempt recovery, wait before retrying, and drop packets if its queue overflows rather than allowing processing to fall behind real time. The example is not a guarantee of uninterrupted playback: viewers may see a gap, and YouTube event continuity is not guaranteed if the connection or process fails. Confirm these options are available and behave as expected in your installed FFmpeg build. The example and its context are in this FFmpeg-devel FIFO recovery discussion from March 2024.
Test the stream and monitor it live
Before the event, test with representative movement and audio, not just a static frame or silent opening. Confirm that the video loops, sound behaves correctly at the boundary, and YouTube receives the expected resolution and stream health. During the stream, watch YouTube’s health messages and FFmpeg’s output for connection or encoding errors. YouTube recommends testing before starting and monitoring stream health during the event.
Troubleshoot common failures
- The file races ahead instead of playing live: Put
-rebefore the file’s-i. It is intended here to pace a file input in real time. - Video repeats but audio does not, or the boundary sounds wrong: The
loopfilter repeats video frames only. Set up an audio loop or other audio strategy separately, then test synchronization and the transition. - YouTube does not receive a stream: Recheck the event’s server URL and stream key, output format, and selected encoder settings. A reset key must also be updated in FFmpeg.
- The stream drops during network trouble: FIFO recovery options can attempt to reconnect after some temporary output failures; they cannot guarantee that viewers see no interruption. Check the installed build’s support and inspect FFmpeg and YouTube health messages.
- Frames or audio stall, or YouTube reports poor health: Check that the selected bitrate matches YouTube’s guidance for the chosen codec, resolution, and frame rate, and that the upload connection can sustain it. Test representative audio and movement before restarting the event.
- A command option is rejected: Verify
ffmpeg -versionand that build’s help or documentation. Option availability can depend on the installed version and build.
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