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Use FFmpeg’s concat demuxer to sequence compatible files, then send them to YouTube with real-time pacing (-re) and stream copy (-c copy). Copy mode avoids re-encoding, but it cannot make mismatched files compatible or repair a source’s bitrate, keyframe interval, resolution, frame rate, or audio settings. Get the current ingest URL and stream key from YouTube Live Control Room, and use RTMPS when your FFmpeg build supports it.
What copy mode does—and what it cannot do
FFmpeg’s -c copy (also written -codec copy) copies the compressed streams without re-encoding. That preserves the existing encoded video and audio and avoids the processing involved in encoding them again. It also means FFmpeg will not change their resolution, bitrate, frame rate, keyframe spacing, or audio codec. If a source does not meet YouTube’s ingest guidance, prepare a compliant source or re-encode it before streaming.
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The concat demuxer presents files in sequence as one input. It is not a general-purpose way to join arbitrary media: FFmpeg requires the files to have matching streams, codecs, and time bases. Its timestamp adjustments also depend on file durations, so inaccurate duration metadata can cause artifacts at segment boundaries. A single file already assembled in playback order avoids cross-file compatibility and duration issues.
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Check the files against YouTube’s ingest guidance
Inspect every segment before building the playlist. Confirm that each has the same stream layout and matching codecs and time bases. Also check the encoded settings you intend to send: copy mode will preserve them rather than adjust them to match YouTube’s recommendations.
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YouTube’s recommended H.264 video bitrates
The figures below are YouTube’s recommendations on its current encoder settings page, accessed in 2026. Match the recommendation to the files’ resolution and frame rate; these are ingest recommendations, not a guarantee that your internet connection can sustain the rate.
| Resolution and frame rate | Recommended H.264 bitrate |
|---|---|
| 720p at 30 fps | 8 Mbps |
| 720p at 60 fps | 8 Mbps |
| 1080p at 30 fps | 14 Mbps |
| 1080p at 60 fps | 17 Mbps |
| 1440p at 30 fps | 21 Mbps |
| 1440p at 60 fps | 34 Mbps |
| 2160p (4K) at 30 fps | 42 Mbps |
| 2160p (4K) at 60 fps | 50 Mbps |
Other settings to verify
- YouTube recommends constant bitrate (CBR), video at up to 60 fps, and keyframes every two seconds; the interval should not exceed four seconds.
- YouTube lists AAC or MP3 audio. For stereo audio, it recommends a 44.1 kHz sample rate and 128 kbps audio bitrate.
- Because stream copy preserves existing encoding, check these properties in the source files rather than expecting FFmpeg to correct them in the command below. See YouTube’s live encoder settings.
Create a concat playlist
- Put the segments in the intended playback order and create a plain-text manifest. The first line must be exactly
ffconcat version 1.0for automatic format recognition. - Add one
filedirective per segment. For example:ffconcat version 1.0 file 'part-001.ts' file 'part-002.ts' file 'part-003.ts' - Save the manifest as
playlist.ffconcat. Quote or escape path characters as needed. FFmpeg’s concat demuxer defaults to safe-path checks; the example command uses-safe 0to allow arbitrary paths. Use that option only with a manifest and local files you trust. See the FFmpeg concat demuxer documentation.
Get YouTube’s ingest URL and key
- In YouTube Studio, open Live Control Room and create or schedule an encoder stream. YouTube provides the stream URL and key in its stream settings.
- Prefer the RTMPS URL when your installed FFmpeg build supports it. RTMPS is RTMP over TLS/SSL; YouTube shows its RTMPS URL from the lock icon in Stream settings. Confirm the exact URL assigned to your stream rather than assuming a fixed endpoint. See YouTube’s RTMPS guidance and YouTube’s encoder setup instructions.
- Treat the stream key like a password. Do not expose it in publicly shared shell history, scripts, screenshots, or logs. For a real setup, use a protected way to supply the key instead of publishing it in a command.
Send the playlist with FFmpeg
Use this command pattern, replacing the URL and key with the current values from Live Control Room:
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ffmpeg -re -f concat -safe 0 -i playlist.ffconcat -map 0:v:0 -map 0:a? -c copy -f flv "$YOUTUBE_RTMPS_URL/$YOUTUBE_STREAM_KEY"-rereads the file input at its native frame rate, pacing it for a live destination. Put it before the input option-i. FFmpeg cautions against using low read rates on actual capture or live inputs because packets may be lost; this use is for file playback.-f concatselects the concat demuxer, and-i playlist.ffconcatsupplies the manifest.-map 0:v:0selects the first video stream.-map 0:a?selects audio if present; if there is no audio, you may omit that mapping.-c copycopies the selected streams. Do not add an encoder such as-c:v libx264, filters, scaling, frame-rate conversion, or audio re-encoding if you need strict copy mode.-f flvspecifies the output muxer used in this command pattern. Confirm the output format and RTMPS URL syntax against the URL YouTube currently provides and your installed FFmpeg build.
This is a command pattern, not a tested invocation. FFmpeg documents -re as reading at the input’s native frame rate and stream copy as copying without re-encoding. See the FFmpeg documentation.
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Test the stream and take it live
- Before an important stream, test representative movement and audio, not just a static frame or silent section. Check that the video and sound arrive as expected.
- Watch the preview and stream-health messages in Live Control Room. For a scheduled stream, wait for the preview and click Go live when YouTube presents that option.
- Monitor the stream during transmission and respond to any health warnings. When finished, end the event through Live Control Room as appropriate, then stop FFmpeg. YouTube says streams under 12 hours are automatically archived.
Troubleshoot common failures
The manifest will not open
- Check that its first line is exactly
ffconcat version 1.0, that every file path is spelled correctly, and that quotes or escapes are valid. - If paths are rejected, review the concat demuxer’s safe-path rules. The example uses
-safe 0; use it only for trusted local manifests and files.
Only the first file plays, or transitions produce artifacts
- Compare every segment’s stream count and layout, codecs, and time bases. The concat demuxer is for matching inputs, not unrelated files.
- Check duration metadata. The demuxer adjusts later timestamps using the preceding file’s duration, so inaccurate durations can disrupt transitions.
Playback runs too fast or timing is wrong
- Make sure
-reappears before the file input in the command. It paces file reading at the native frame rate. - Do not apply this file-pacing approach to a live or capture input at an artificially low rate; FFmpeg warns that doing so can result in packet loss.
YouTube reports ingest or quality problems
- Compare the source against YouTube’s recommended H.264 bitrate for its resolution and frame rate, the keyframe interval, CBR guidance, frame-rate limit, and audio requirements.
- Copy mode cannot change an encoding mismatch. Create a compliant source or re-encode it, then inspect and test the result.
RTMPS connection or certificate error
- Confirm you copied the exact RTMPS URL from Live Control Room and that the installed FFmpeg build supports RTMPS.
- Check network and client port requirements, including whether port 443 is needed. YouTube’s RTMPS troubleshooting guidance identifies the protocol or URL, port, and client support as checks.
No preview appears
- Verify that FFmpeg is transmitting to the correct URL with the corresponding key, then inspect the status and messages in Live Control Room.
- For a scheduled event, wait for YouTube’s preview and use its Go live control when prompted.
Choose RTMPS, RTMP, copy mode, or re-encoding
| Choice | What it means for this workflow |
|---|---|
| RTMPS | YouTube’s encrypted RTMP transport. Prefer it when your FFmpeg build and network support it; use the exact URL supplied in Live Control Room. |
| RTMP | An alternative when RTMPS is unavailable. YouTube recommends RTMPS; confirm the current ingest details in Live Control Room. |
| Copy mode | Preserves the compressed streams without re-encoding. It avoids re-encoding but cannot repair noncompliant settings or reconcile incompatible segments. |
| Re-encoding | Lets you change encoding parameters, but it is no longer a strict copy workflow. Prepare and quality-check the newly encoded output. |
| Concat playlist | Sequences compatible files through the concat demuxer; matching streams, codecs, and time bases are required. |
| One assembled file | Avoids cross-file compatibility and duration-metadata issues, though its encoded streams still need to meet the intended ingest settings. |
Or let it run in the cloud
If your goal is a continuously running YouTube channel rather than operating FFmpeg on your own computer, StreamNeo is a cloud option for uploaded videos and playlists. Upload your recording or build a playlist, add your YouTube stream key once, and go live. Your computer and home connection do not have to stay on, and StreamNeo automatically recovers if YouTube drops the stream.
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