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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsYes, FFmpeg can loop a video into a YouTube Live stream with -c copy—but only when the source audio and video already fit YouTube’s ingest requirements and the output container. Stream copy does not re-encode or repair a file. It preserves the existing streams, so unsuitable codecs, keyframe spacing, or timing must be addressed at the source or by re-encoding.
What `-c copy` does—and does not do
In FFmpeg, -c copy selects stream copy for the output: FFmpeg passes the compressed audio and video through without decoding and re-encoding them. That can reduce encoding work and avoid a generation of quality loss, but it also means FFmpeg does not convert codecs, change resolution or frame rate, or create a new keyframe pattern. If the source bitstream does not meet the requirements of the output path, copying it will not make it compliant.
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Copying can work when the selected streams are supported by the output container and YouTube’s chosen ingest protocol, their timing is usable, and the source’s keyframes are sufficiently frequent. Check audio as well as video: for RTMP/RTMPS, YouTube lists AAC or MP3 audio, and 5.1 surround is supported only with AAC.
Check the source against YouTube Live requirements
YouTube’s encoder guidance, accessed October 3, 2026, recommends RTMPS for RTMP-based delivery. It lists H.264, H.265/HEVC, and AV1 video, frame rates up to 60 fps, constant bit rate (CBR), and a recommended keyframe interval of two seconds; do not exceed four seconds. These are ingest recommendations, not transformations FFmpeg applies when copying.
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| Setting | YouTube guidance for RTMP/RTMPS | What it means for stream copy |
|---|---|---|
| Video codec | H.264, H.265/HEVC, or AV1 | The source codec stays as encoded; copy cannot convert it. |
| Frame rate | Up to 60 fps | The source frame rate is preserved. |
| Rate control | CBR | Copy cannot impose a new rate-control mode on the encoded video. |
| Keyframes | Recommended every 2 seconds; do not exceed 4 seconds | The source keyframe cadence remains unchanged. |
| Audio | AAC or MP3; 5.1 surround only with AAC. Advanced settings recommend stereo, 44.1 kHz, 128 kbps. | The source audio codec and properties remain unchanged. |
Bitrate guidance depends on codec, resolution, and frame rate. For H.264, YouTube lists 1080p30 at 5 Mbps minimum and 14 Mbps recommended; 1080p60 at 6 Mbps minimum and 17 Mbps recommended; and 720p30 at 3 Mbps minimum and 8 Mbps recommended. Those values are examples for the named H.264 modes, not universal targets for other codecs or settings. Choose the matching row in YouTube’s encoder settings guidance.
Decide whether to copy or re-encode
Choose stream copy when the existing streams already fit
Inspect the actual file’s video and audio codecs, resolution, frame rate, keyframe spacing, and timing. Compare them with the destination container and YouTube’s guidance. If the streams are suitable and the loop behaves as required in a test, copying avoids encoding work and preserves the existing encoded quality.
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Re-encode when a source property needs to change
If a required codec conversion, bitrate or rate-control change, resolution or frame-rate adjustment, or different keyframe cadence is needed, encode the affected stream instead of expecting -c copy to change it. Re-encoding gives you control over those properties but requires processing and can affect quality; the trade-off depends on the source and encoding settings.
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Use `-re` to pace file input—not to fix compatibility
When a media file is being sent as a live source, FFmpeg’s -re option reads the input at its native frame rate; the FFmpeg documentation defines it as equivalent to -readrate 1. It controls input pacing. It does not alter the encoded streams, repair timestamps, or make an unsuitable codec or keyframe pattern acceptable.
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There is no universal copy-and-loop command guaranteed to work for every MP4, MKV, or other file and output combination. The appropriate loop and output options depend on the media and delivery path. In particular, the FFmpeg documentation’s loop behavior cited for GIF demuxing is specific to GIFs, not a general recipe or seamless-loop guarantee for arbitrary video files. Inspect and test the exact source rather than assuming that a command for one file type will work for another.
Test the complete path, including the loop boundary
- Inspect the source’s audio and video streams, including codec, resolution, frame rate, timing, and keyframe spacing. Compare each relevant property with the intended output container and YouTube ingest protocol.
- Set up the YouTube Live event and choose the appropriate ingest destination. For an RTMP-based connection, YouTube recommends RTMPS; use the stream key for the intended event and keep it private.
- If the input is a file, pace it in real time where appropriate with
-re. Use stream copy only for streams that already fit the destination requirements. - Test with representative audio and movement before relying on the stream. YouTube specifically advises testing with audio and video motion similar to what the live stream will contain.
- Monitor YouTube’s stream health or status during the test, including while the video reaches its repeat point. Check for interruptions, ingest warnings, and whether audio and video remain synchronized after the boundary.
- If a source property conflicts with ingest guidance, re-encode the affected stream and test again. Test the intended duration and repeat behavior; official guidance does not guarantee seamless looping for every file and output path.
YouTube’s Live Streaming API documents primary and backup ingest addresses and stream status fields. A backup address is an alternate destination; its existence does not mean an FFmpeg process will automatically reconnect or resume if its connection fails. RTMPS secures the RTMP-based connection but is not a guarantee of uninterrupted delivery.
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Why a copied live loop can fail
- Codec or container mismatch: the source stream may not be accepted by the selected output path. Stream copy cannot convert it.
- Unsuitable keyframe spacing or bitrate characteristics: these are properties of the encoded source. Copying does not generate new keyframes or apply new rate control.
- Audio incompatibility: check that the audio codec and configuration fit the selected protocol; do not overlook audio when video appears correct.
- Pacing or timing issues:
-repaces file reading, but it does not correct all timestamp or timing problems in the source. - Loop-edge discontinuity: the repeat point can expose file-specific timestamp or continuity behavior. The official references do not establish one universal boundary failure mechanism, so test the exact file and loop method.
- Connection interruption: RTMPS does not ensure a process reconnects after a drop. Check the FFmpeg process and YouTube status rather than treating the protocol or backup address as automatic recovery.
Use YouTube’s stream-health feedback to narrow down ingest problems, then inspect the source rather than applying a one-line fix blindly. YouTube’s guidance recommends testing before going live with representative audio and movement.
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Frequently Asked Questions
Does `-re` make an incompatible file work with YouTube Live?
No. It paces file input at its native frame rate; it does not convert or repair the encoded streams.
Can `-c copy` guarantee a seamless repeat?
No. Loop-boundary behavior depends on the specific file and output path, so test the exact source and intended repeat method.
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