To convert variable frame rate (VFR) video for a YouTube Live loop, re-encode it onto a constant frame-rate timeline before loading it into your encoder. A frame-rate label change or stream copy alone does not do that. Choose a rate that suits the source, then test the converted file and the encoder’s repeat-media behavior—including the transition from the end back to the beginning—before broadcasting.
What VFR conversion changes
In a variable frame rate file, the intervals between frames vary. A constant frame rate (CFR) output places frames on a regular timeline. The conversion may repeat or drop frames to fit that cadence; it cannot restore motion that the camera or original recording did not capture.
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With FFmpeg, the fps filter uses frame presentation timestamps to keep, repeat, or drop frames on a regular output timeline. FFmpeg’s output -r option also duplicates or drops frames when encoding. In stream-copy mode, however, -r does not convert the video frames. See the FFmpeg command documentation and FFmpeg filter documentation.
Choose a target frame rate
There is no single frame rate that is right for every VFR source. Choose a rate that fits the source’s intended motion and the capabilities of the live encoder you will use. If the chosen rate differs from the source’s cadence, the conversion can introduce repeated or dropped frames, so watch the result rather than assuming a particular rate will look best.
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YouTube’s live encoder guidance supports frame rates up to 60 fps. Set the encoder’s outgoing rate consistently with your intended output and check its codec, resolution, audio, bitrate, and protocol settings against YouTube’s current live encoder guidance. Its bitrate ranges are specified by codec, resolution, and frame rate and may change; consult the current page rather than relying on an old preset.
Inspect the file before converting
- Open the source in a media probe or video editor and check its dimensions, audio tracks, and frame timing.
- Do not conclude that a file is CFR just because a probe or editor displays an average frame rate. Confirm whether the frame timestamps are actually regular.
- Decide which audio track to retain and whether its synchronization is acceptable. Keep the original file so you can compare it with the converted output.
Convert to a constant frame rate with FFmpeg
Use FFmpeg’s fps filter when you want to re-encode frames onto a regular cadence. Replace input.mp4, output.mp4, and 30 with your file names and chosen rate; 30 here is only an example, not a universal recommendation:
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ffmpeg -i input.mp4 -vf "fps=30" -c:v libx264 -crf 18 -preset medium -c:a aac -b:a 192k output.mp4
This example encodes video with H.264 and audio with AAC; the quality and speed options are illustrative starting points, not YouTube requirements or a guarantee of a particular file size. Confirm the available encoders and options for your installed FFmpeg build, and adjust them for your workflow. If there is no audio track, remove the audio options. If you need a different output container or codec, use settings supported by both your local encoder and YouTube’s live ingest path.
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You can also specify a rate with output -r while encoding, but do not combine it with stream copy expecting a conversion: copying the video stream does not create CFR frames. FFmpeg documents the distinction in its command options and explains the fps filter in its filter documentation. This command is a documented approach, not a tested result for your particular file; verify the output locally.
Configure the YouTube Live encoder to loop the file
Converting the file does not itself start a live broadcast. The encoder must read the file, repeat it according to that encoder’s media-loop setting, and send a live feed to YouTube. Loop controls differ between encoders, so enable the relevant repeat or loop-media option in the software you use rather than assuming one setting applies everywhere.
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- In YouTube Live Control Room, configure the stream and obtain its stream URL and stream key. Follow YouTube’s live stream settings instructions.
- In your encoder, add the converted file as the media source and enable its repeat or loop behavior.
- Configure the outgoing feed for YouTube’s supported ingest protocol and encoder settings. YouTube’s current guidance lists RTMP/RTMPS, H.264, H.265/HEVC, or AV1 video, AAC or MP3 audio, CBR, up to 60 fps, and a recommended two-second keyframe interval that should not exceed four seconds. Match the selected codec, resolution, frame rate, and bitrate to the current values on YouTube’s live encoder settings page.
- Enter the stream URL and stream key in the encoder’s YouTube destination settings. Treat the key as a credential: do not share it or expose it in a public screenshot.
YouTube’s general upload encoding recommendations cover uploaded videos, not a special format requirement for a file read locally by a live encoder. For this workflow, distinguish the local playback file from the encoded live feed sent to YouTube.
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- Play the converted file from beginning to end. Look for judder, repeated or missing-looking motion, damaged frames, and audio that drifts out of sync.
- Watch the final seconds and the restart at the beginning. Check both picture and sound at the loop boundary; a repeated file is not necessarily a seamless loop.
- Run a test through the intended encoder and YouTube preview. Confirm that the feed connects, the file repeats as expected, and stream health remains acceptable.
- Check that your upstream connection has enough capacity for the selected live bitrate, with headroom for normal variation.
YouTube advises: “Make sure to test before you start your live stream.” Its streaming tips also recommend testing and monitoring. A successful test is useful validation, not a guarantee that every future broadcast or loop will be trouble-free.
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Troubleshoot common problems
- The output still appears variable-rate: Check that you re-encoded with the
fpsfilter or an encoding-mode output-r. A stream-copy operation does not convert the frames. - Motion looks uneven: The selected output cadence may not suit the source. Try another rate appropriate to its intended motion, convert again, and compare the same scenes. Conversion can repeat or drop frames.
- Audio is missing or out of sync: Check whether the source has an audio track, confirm the selected track in the conversion and encoder, and review synchronization throughout the file—not just at the beginning.
- The stream will not connect: Verify the stream URL, stream key, protocol, and encoder settings in Live Control Room and your encoder. Check YouTube’s current supported settings rather than assuming a local file’s codec is also the outgoing live codec.
- The file plays once and stops: Enable the encoder’s file-repeat behavior. Looping is an encoder-specific control; converting the file does not enable it.
- The broadcast buffers or loses health: Compare available upstream bandwidth with the configured live bitrate and reduce the bitrate or output demands if the connection cannot sustain them. Leave bandwidth headroom and test again.
- The loop has a visible or audible jump: Inspect the last and first frames and audio at the boundary. If the content itself does not join cleanly, changing frame rate alone will not make the transition seamless.
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