The Tool Desk
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What you need before starting
- A channel eligible to live stream. YouTube says the channel must be verified and have had no live-streaming restrictions in the past 90 days. Check YouTube’s live-streaming eligibility guidance.
- A local MP4 file with video and, if needed, audio. Check that you have the rights to stream its contents; owning a file does not necessarily give you permission to broadcast the music, footage, or other material in it.
- FFmpeg installed on a computer that can remain on and connected for the duration of the broadcast. The command below is for a file input, not a live camera or capture-device input.
- A reliable upload connection with enough capacity for the chosen video and audio bitrate.
- A YouTube encoder stream’s server URL and stream key from YouTube Studio. Treat the key like a password: do not publish it or share a command containing it.
Set up the YouTube stream
- In YouTube Studio, create or select an encoder stream. Copy the server URL and stream key shown in the stream settings. YouTube’s encoder setup guide describes the workflow. Use the RTMPS server URL if Live Control Room provides one; YouTube recommends RTMPS.
- Keep the URL and key private. Use the exact endpoint and key format shown in Studio; do not assume every encoder expects them joined in the same way. The example command below shows a common RTMP-style destination, but substitute the actual server URL and key from your stream settings.
- If the key is exposed, reset it in YouTube Studio before broadcasting again.
Loop one MP4 continuously with FFmpeg
This illustrative command encodes a 30 fps source to H.264 video and AAC audio, then sends the result to YouTube. Replace input.mp4 and the destination with your own values. Do not paste a real stream key into a public script, screenshot, or support post.
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"The command has not been run or tested as a complete setup. FFmpeg builds, source-file streams, and YouTube stream settings differ, so test the exact file and destination before relying on it.
What the options do
-stream_loop -1requests infinite repetition of the next input.-1means repeat indefinitely.-rereads the file at its native rate, pacing it like a live feed. FFmpeg cautions against using this on an actual live input; it is intended here for a file.-i input.mp4identifies the input file. The loop and realtime options are placed before this matching input.-c:v libx264encodes video as H.264. H.264 is a broadly compatible example, not YouTube’s only accepted video codec.-preset veryfasttrades some compression efficiency for lower encoding workload. If the computer cannot keep up, check CPU use and FFmpeg output; a faster preset may help, but it does not fix a weak upload connection or an incompatible source.-b:v,-maxrate, and-bufsizeset a target video bitrate, peak rate, and rate-control buffer. The example’s 4,500 kbps target is not a universal YouTube recommendation; choose values for your resolution and frame rate.-g 60sets a 60-frame GOP, which is two seconds at 30 fps.-keyint_min 60and-sc_threshold 0keep this example’s keyframe interval regular. At other frame rates, set the GOP to approximately twice the frames per second to target two seconds.-c:a aac -b:a 128k -ar 44100encodes AAC audio at 128 kbps and 44.1 kHz. If the MP4 has no audio, or its audio layout needs special handling, adjust the audio options accordingly.-f flvselects the output container commonly used for RTMP/RTMPS encoder streaming. Use the server URL and destination format appropriate to the exact endpoint and encoder workflow in Studio.
Choose resolution, bitrate, and keyframes
YouTube’s encoder guidance recommends constant bitrate (CBR), a two-second keyframe interval, and not exceeding four seconds. It lists H.264, H.265/HEVC, and AV1 for video; AAC or MP3 for audio; and frame rates up to 60 fps. The table gives YouTube’s current H.264 bitrate recommendations as accessed in 2026; these are platform recommendations, not guarantees of stream quality.
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| Output target | YouTube H.264 video bitrate recommendation | Keyframe target |
|---|---|---|
| 720p at 30 fps | 8 Mbps | 2 seconds |
| 1080p at 30 fps | 10 Mbps | 2 seconds |
| 1080p at 60 fps | 17 Mbps | 2 seconds |
YouTube recommends 128 Kbps for stereo audio. For settings beyond these examples, use YouTube’s encoder settings and bitrate table and match the recommendation to the selected codec, resolution, and frame rate. YouTube also recommends square pixels, progressive scan, two B-frames, one reference frame, and Rec. 709 for SDR in its advanced guidance.
Choose a quality your upload connection can sustain reliably, with room for normal network variation. A bitrate recommendation is not a substitute for testing: watch stream health in Live Control Room and reduce the output target if the connection cannot hold it.
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Start, test, and stop the broadcast
- Run the command and read FFmpeg’s console output for connection or encoding errors.
- For a scheduled stream, wait for the encoder preview in Live Control Room and select Go live if the stream’s settings require it. The precise workflow depends on stream settings such as auto-start.
- Before a public broadcast, test the actual file with representative motion and audio. Watch for missing audio, stuttering, a visible jump at the repeat point, or stream-health messages.
- To end the broadcast, stop FFmpeg from sending and end the stream in Live Control Room as applicable. YouTube says streams under 12 hours are automatically archived; this is an archive rule, not a promise that an indefinitely running stream will produce one uninterrupted recording. See YouTube’s encoder stream instructions.
Make the repeat point less disruptive
-stream_loop -1 repeats the input, but it cannot make a file’s end match its beginning. A hard cut, pause, repeated silence, abrupt music restart, or timestamp issue can still be noticeable. Listen and watch across several loop transitions before going live. If the transition is unsuitable, edit the source into a better loop before streaming; FFmpeg’s loop option alone does not create a crossfade or gapless transition.
For a stream-copy experiment, replace the encoding options with -c copy only when the source codecs, stream layout, container handling, and timestamps are compatible. Copying avoids re-encoding, but it cannot normalize the media or give you precise control over the encoded bitrate and keyframe interval. If playback breaks at the repeat point or the stream is rejected, inspect the error output and try a re-encoded baseline such as the H.264/AAC example above. Re-encoding gives more control over output settings and uses processing resources; it is not a guaranteed cure for every source-file problem. See the FFmpeg documentation for input-looping, realtime-read, encoding, and stream-copy option semantics.
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Troubleshoot common failures
| Symptom | Likely checks and fixes |
|---|---|
| FFmpeg sends the file too quickly or the stream does not behave like live video | For a file input, confirm -re appears before its -i. Do not use this pacing option on an actual live input. |
| YouTube does not receive the encoder feed | Recheck channel live eligibility, the server URL, and the stream key in YouTube Studio. Confirm that the stream key has not been reset or copied incorrectly, and use the exact URL/key format expected by the destination. |
| Stream health reports buffering or dropped frames | Compare the configured bitrate with reliable upload capacity. Choose a lower resolution, frame rate, or bitrate if needed, then test again. Check whether FFmpeg is keeping up with encoding rather than assuming every stall is a network issue. |
| Video or audio is rejected or missing | Inspect the file’s streams and FFmpeg’s error output. Source codecs, audio layout, pixel format, and FFmpeg build can require different settings; test a re-encoded H.264/AAC output rather than assuming stream copy will work. |
| The picture or sound jumps at the loop boundary | Play the source across its end and beginning; the mismatch may be in the media itself. If the failure aligns exactly with the repeat point, inspect FFmpeg errors and timestamps, then test a re-encoded output. Infinite looping does not promise seamless transitions. |
| The stream starts but never becomes public | Check the stream’s scheduled/live settings and preview in Live Control Room. Select Go live where required; auto-start behavior varies by configuration. |
When asking for help, include the FFmpeg version, the full command with the stream key redacted, the console error, the file’s stream details from ffprobe, and whether the failure happens exactly at the loop boundary.
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