Yes—FFmpeg can send a looping video to YouTube Live with -c copy when the file’s existing audio and video streams already fit the output container and YouTube’s ingest requirements. Copy mode does not re-encode or fix codecs, bitrate, keyframe spacing, or timing. Inspect and test the exact file: a loop that works for one source is not guaranteed to repeat seamlessly for every file.
What -c copy does—and does not do
FFmpeg’s copy output codec selection passes the selected compressed streams through without re-encoding. That can avoid encoding work and preserve the source’s encoded video and audio, but it cannot convert codecs, change resolution or frame rate, set a new bitrate, or create a different keyframe pattern. Those changes require encoding the affected stream.
Compatibility depends on the source streams, output container, timing, and YouTube ingest path. Check audio as well as video. YouTube’s RTMP/RTMPS guidance lists AAC or MP3 audio; 5.1 surround is supported only with AAC on that protocol.
Check YouTube’s ingest requirements first
YouTube’s encoder guidance, accessed October 3, 2026, recommends RTMPS for RTMP-based delivery and lists H.264, H.265/HEVC, and AV1 video, up to 60 fps, CBR, and a two-second keyframe interval; it says not to exceed four seconds. These are ingest recommendations, not properties FFmpeg will impose on a copied source.
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| Setting | YouTube guidance for RTMP/RTMPS |
|---|---|
| Video codecs | H.264, H.265/HEVC, or AV1 |
| Frame rate | Up to 60 fps |
| Rate control | CBR |
| Keyframes | Every 2 seconds recommended; do not exceed 4 seconds |
| Audio | AAC or MP3; stereo 44.1 kHz and 128 kbps recommended in advanced settings; 5.1 only with AAC |
Bitrate depends on codec, resolution, and frame rate. For H.264 at 1080p30, YouTube lists 5 Mbps minimum and 14 Mbps recommended; at 1080p60 it lists 6 Mbps minimum and 17 Mbps recommended; at 720p30 it lists 3 Mbps minimum and 8 Mbps recommended. Do not apply one row to other formats or codecs. Consult YouTube’s live encoder settings for the row that matches your stream.
Decide whether the source is suitable for copy
- Inspect the file’s streams. Use
ffprobeor another media inspector to identify the video and audio codecs, resolution, frame rate, stream timing, and keyframe spacing. Compare the actual streams—not just the filename extension—with the output container and YouTube guidance. - Choose copy only if the existing streams fit. If the codec, keyframe cadence, or another required property is unsuitable, stream copy cannot correct it. Re-encode the stream that needs adjustment; the other stream can remain copied if it is compatible.
- Use real-time pacing for a file source. FFmpeg’s
-rereads input at its native frame rate (equivalent to-readrate 1). It is input pacing, not an encoder or a compatibility fix. - Configure the intended output and ingest protocol. Use the YouTube ingest address and stream key for the selected protocol; prefer RTMPS for RTMP-based delivery.
- Test with representative material and inspect stream health. Include audio and motion like the intended stream, watch YouTube’s status feedback, and test the exact file duration and repeat boundary you plan to run.
There is no universal command that guarantees every MP4 or MKV will loop cleanly in copy mode. The official FFmpeg loop reference surfaced for GIFs is specific to GIF demuxing, not a general promise for arbitrary video files. Use a command only after confirming its input, output format, and loop behavior against your actual media and ingest settings.
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Why copy mode works—or fails
It is a good fit when
- The existing video and audio codecs are accepted by the chosen output and YouTube ingest path.
- The source’s bitrate, frame rate, keyframe cadence, and timing are suitable for the intended live stream.
- The file’s repeat boundary behaves acceptably in a test of the exact output path.
It may fail when
- The source codec or container does not match the output path or ingest requirements.
- Audio is absent, unsuitable, or encoded in a format the chosen path will not accept.
- Keyframes are too far apart, or the source has timing or pacing problems.
- The repeat boundary exposes a discontinuity or timestamp behavior that the specific file and output path do not handle well.
These are diagnostic categories, not a claim that any one issue causes every failed loop. The available official guidance does not establish a universal loop-boundary failure mechanism or certify every file/container combination as seamless.
When to re-encode instead
Choose re-encoding when the existing bitstream cannot meet a required codec, resolution, frame rate, bitrate, or keyframe structure. Encoding gives you control over those properties, but requires processing resources and can affect quality; the trade-off depends on your source and settings. For example, if H.264 keyframes are too far apart for the intended live guidance, copying cannot insert new encoded keyframes. Encode the video with suitable rate control and keyframe settings instead. Avoid re-encoding streams that already meet your needs unless you have a reason to change them.
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Troubleshoot a failed or unstable loop
| Symptom | What to check | Next step |
|---|---|---|
| YouTube rejects the stream or reports an unsupported format | Inspect video and audio codecs and confirm they fit the output container and ingest protocol. | Use a compatible output path or re-encode the affected stream. |
| YouTube reports keyframe or bitrate problems | Compare the source’s actual keyframe spacing and bitrate with the guidance for its codec, resolution, and frame rate. | Re-encode the video with suitable settings; -c copy cannot change them. |
| Playback is too fast, too slow, or otherwise mistimed | Check file timestamps and pacing. For file input, confirm whether real-time pacing with -re is appropriate. |
Correct the timing or pacing issue; do not expect -re to make an incompatible stream compliant. |
| The stream breaks or glitches at the repeat point | Test the boundary with the exact file, container, and output path; inspect timestamps and continuity around the end and restart. | Try a different looping or encoding approach for that media. No general setting guarantees a seamless copy-mode boundary. |
| YouTube shows poor stream health or the connection drops | Review YouTube’s stream status and health feedback, and verify the ingest destination and connection. | Test again with representative audio and motion. RTMPS secures RTMP-based delivery but does not guarantee an uninterrupted connection. |
YouTube’s Live Streaming API documents primary and backup ingest addresses and stream status/health fields. A backup address is an alternate destination; its existence does not mean an FFmpeg process will automatically reconnect or resume.
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