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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchTo loop an MP4 indefinitely while sending it to YouTube Live, put -stream_loop -1 before the input and use -re to read the file at its normal playback rate. Then encode a YouTube-compatible live feed and send it to the server URL and stream key shown in YouTube Studio. The example below is a starting point—not a tested, universal command—so verify the source file, stream preview, audio and loop transition before relying on it.
What you need before starting
- An FFmpeg build available on the computer that will run the stream.
- A YouTube channel eligible to live stream. YouTube says the channel must be verified and must have had no live-streaming restrictions in the past 90 days; see YouTube’s live-streaming eligibility and testing guidance.
- An MP4 file you have the rights to stream, plus stable upload bandwidth suitable for the chosen resolution and frame rate.
- A server URL and stream key from YouTube Studio’s encoder stream setup. Treat the key like a password; do not share or publish it.
Start with an FFmpeg loop command
Replace input.mp4 with the path to your file. Replace the output destination with the exact ingest server URL and key provided in YouTube Studio. YouTube recommends RTMPS; use the RTMPS endpoint when Live Control Room provides one. Follow the URL/key format expected by your encoder setup rather than assuming every account uses the same endpoint.
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"This illustrative command assumes 30 fps: a GOP of 60 frames targets a two-second keyframe interval. Its 4,500 Kbps video bitrate is only an example and does not match YouTube’s recommended bitrate for every resolution or frame rate. Use the matching recommendation below and choose a rate your reliable upload connection can sustain. The shown RTMP address is an example; substitute the exact server URL and key supplied in Studio.
What the loop and pacing options do
-stream_loop -1requests infinite repeats of the input file. Place it before the-iit applies to.-rereads the file at its native frame rate, pacing file playback like a live source instead of sending the content as fast as the computer can process it. FFmpeg cautions against using this option on an actual live input.-c:v libx264and-c:a aacencode video and audio into a broadly compatible example output. YouTube also lists H.265/HEVC and AV1 video, and AAC or MP3 audio, in its encoder guidance.-f flvselects the output container used for this RTMP-style example.
The command is assembled from documented FFmpeg options and YouTube guidance; it has not been run or tested against your file. A particular FFmpeg build, source stream layout, audio format, pixel format or loop-boundary timestamps may require changes.
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Choose YouTube-compatible encoder settings
YouTube’s published recommendations are configuration guidance, not a guarantee of stream quality. Match bitrate to the selected codec, resolution and frame rate, and test the actual stream. The figures below are YouTube recommendations for H.264 video and stereo audio in guidance accessed in 2026.
| Output | YouTube-recommended bitrate |
|---|---|
| 720p at 30 fps, H.264 | 8 Mbps |
| 1080p at 30 fps, H.264 | 10 Mbps |
| 1080p at 60 fps, H.264 | 17 Mbps |
| Stereo audio | 128 Kbps |
These are the available examples, not an exhaustive bitrate table. Consult YouTube’s current encoder settings and bitrate guidance for other output combinations. Its guidance recommends constant bitrate (CBR), a two-second keyframe interval and says not to exceed four seconds. The example’s -g 60 and -keyint_min 60 target two seconds only at 30 fps; at a different frame rate, set the GOP in frames accordingly. The example does not force every advanced encoding parameter YouTube discusses.
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YouTube’s advanced recommendations also include square pixels, progressive scan, two B-frames, one reference frame and Rec. 709 for SDR. Use the settings appropriate to your source and encoder; avoid changing color or scan characteristics without checking the result.
Connect FFmpeg to YouTube Studio
- Confirm live access. Check that your channel meets YouTube’s current eligibility requirements in YouTube Help.
- Create or select an encoder stream. In YouTube Studio, open the live-stream setup and choose an encoder stream. Copy its server URL and stream key. YouTube’s encoder setup instructions explain the setup. Keep the key private; if it is exposed, reset it in Studio.
- Prepare the command destination. Use the exact ingest URL supplied by Studio, preferably its RTMPS endpoint when offered, and include the stream key in the form expected by your encoder. Do not paste a real key into a public post, shared script or screenshot.
- Start FFmpeg and inspect the preview. For a scheduled stream, wait for the encoder preview in Live Control Room and select Go live if the stream’s settings require it. Auto-start and control-room workflows can vary by stream configuration.
- Test and monitor. Before a long broadcast, test with representative motion and audio. Watch YouTube’s stream health and messages, and check that the picture, sound and repeat point behave as intended.
- End the broadcast deliberately. Stop FFmpeg’s output and end the stream in the control room where applicable. YouTube says streams under 12 hours are automatically archived; do not assume that applies to a stream lasting 12 hours or longer.
Check whether the MP4 repeats cleanly
-stream_loop -1 repeats the input; it does not guarantee a seamless transition or a valid continuous stream for every file. Watch at least one full repeat in a test stream. Listen for a gap or click in the audio and look for a pause, jump, black frame or timestamp error at the boundary. If the source itself ends with silence or a visual discontinuity, looping will repeat that too.
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If the stream fails at the repeat point, read FFmpeg’s console output and test a re-encoded baseline such as the H.264/AAC pattern above. A stream-copy version using -c copy can be a faster experiment only when the codecs, stream layout and timestamps are compatible. Copying does not let FFmpeg reshape the encoded media to a target bitrate or keyframe interval, and it does not guarantee clean timestamps at the repeat point. Re-encoding gives more control over output settings but uses processing resources and cannot guarantee that every source problem will be fixed.
For a playlist of different files, do not assume the single-file loop command will concatenate them cleanly. A concat workflow may require matching stream structure and time bases; that is a separate setup from repeating one MP4.
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Troubleshoot common failures
| Symptom | What to check | Practical next step |
|---|---|---|
| YouTube receives no signal | Check FFmpeg’s output destination, server URL, stream key and console error. Confirm that the key belongs to the selected encoder stream. | Copy the current URL and key from Studio, protect the key, and retry. If the key may have leaked, reset it. |
| Stream starts but YouTube reports poor health | Check whether the chosen bitrate exceeds stable upload capacity and whether bitrate mode and keyframe interval match YouTube guidance. | Try a lower supported resolution or frame rate and its corresponding bitrate recommendation; test before the full broadcast. |
| FFmpeg errors or playback breaks at the loop boundary | Inspect the complete error output and note whether the failure happens exactly when the file repeats. Source timestamps, stream layout or codecs may be involved. | Try re-encoding instead of -c copy. For diagnosis, record the FFmpeg version, source stream details from ffprobe, and the full command with the stream key redacted. |
| No audio, distorted audio or an unexpected channel layout | Check whether the MP4 contains an audio stream, its codec and channel layout, and whether FFmpeg reports an audio conversion error. | Use an AAC output configuration suitable for the source, then verify the sound in a test preview. The example’s stereo recommendation is 128 Kbps. |
| Video or audio jumps at every repeat | Distinguish a discontinuity already present at the file’s end from an encoder or timestamp issue at the repeat point. | Test a re-encoded output and inspect the source’s last and first frames and audio samples. Infinite looping alone does not create a gapless edit. |
Or let it run in the cloud
If the goal is to keep a pre-recorded YouTube stream running without leaving a computer on, StreamNeo is a cloud option: upload a recording or build a playlist, add your YouTube stream key, and go live. It loops uploaded videos to YouTube; it is not a camera-streaming service.
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