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To stream a playlist of pre-recorded videos to YouTube Live with FFmpeg, first check whether the clips have compatible streams. Use FFmpeg’s concat demuxer to join compatible files without re-encoding; use the concat filter and encode when you need to normalize different clips or apply filters. Then send the output to the RTMPS ingest URL for a YouTube Live stream using its private stream key.
Choose the right FFmpeg concat method
FFmpeg offers two different approaches. The concat demuxer joins compatible encoded streams by copying packets, avoiding a decode-and-re-encode cycle. The concat filter joins decoded media and is the better choice when inputs need changes such as resizing or frame-rate normalization. FFmpeg’s FAQ distinguishes the approaches: use the filter when re-encoding is needed (FFmpeg FAQ).
| Method | Best for | Trade-off |
|---|---|---|
| Concat demuxer with stream copy | Clips with compatible streams when you want to preserve encoded packets. | Fast and avoids re-encoding, but cannot apply filters and may fail or produce poor transitions if stream properties are incompatible. FFmpeg documentation |
| Concat filter with encoding | Clips that need filtering or normalization before they form one output stream. | Requires encoding work and can reduce quality, but gives you control over a consistent output. |
Before choosing, compare the files’ stream layout, codecs, time bases, dimensions, frame rates and audio configuration. Differences in these properties are warning signs for copy-only concatenation, not a guarantee that it will fail. Test the actual playlist and watch the transitions; neither method guarantees seamless joins.
Prepare the YouTube Live destination
- In YouTube Live Control Room, create or select a live stream and retrieve its stream URL and stream key. YouTube’s live stream settings guide explains where to manage them.
- Treat the stream key like a password. Do not publish it in a command, tutorial, screenshot or log. If it is exposed, reset it in YouTube’s live stream settings.
- Use YouTube’s current encoder settings for the codec, resolution, frame rate, keyframe interval and bitrate you intend to send. YouTube recommends RTMPS, an encrypted extension of RTMP; FFmpeg documents the protocol at its protocol documentation.
Build the playlist and stream it
The exact concat playlist syntax and path-handling behavior can depend on the FFmpeg build and how your files are arranged. Check the documentation for the installed build before preparing the playlist; do not disable path-safety checks as a shortcut. Once the playlist is ready, pass it to the concat demuxer as an input and send the resulting stream to YouTube’s ingest destination. Keep the stream key out of any command or log that could be shared.
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For compatible files, the workflow is to use the concat demuxer input and stream copy for the output. If the clips differ enough to require normalization or filtering, use the concat filter, set a consistent output format and encode instead. Stream copy copies packets without decoding or encoding, so it cannot apply filters; it also cannot fix missing or incompatible information required by the output (FFmpeg documentation).
Match the output to YouTube’s ingest guidance
YouTube’s encoder guidance supports RTMP or RTMPS and lists H.264, H.265 (HEVC) and AV1 video, plus AAC or MP3 audio. It says to use CBR, recommends a two-second keyframe interval and advises not to exceed four seconds. Check its current table for the selected codec, resolution and frame rate rather than treating settings as interchangeable across formats.
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For H.264, YouTube’s guidance checked in 2026 lists these platform recommendations:
| Output | Minimum bitrate | Recommended bitrate |
|---|---|---|
| 720p at 30 fps | 3 Mbps | 8 Mbps |
| 720p at 60 fps | 3 Mbps | 8 Mbps |
| 1080p at 30 fps | 5 Mbps | 14 Mbps |
| 1080p at 60 fps | 6 Mbps | 17 Mbps |
These are YouTube-published ingest recommendations, not independent performance-test results. The page lists additional combinations; choose the row that matches your encoded output (YouTube encoder settings).
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Rehearse and troubleshoot before going public
Run a test with audio and movement similar to the intended playlist. Watch YouTube’s stream health and messages during the test. YouTube recommends checking upload capacity, using a reliable network and leaving 20% bandwidth headroom; that margin is guidance, not a guarantee of network performance (YouTube streaming tips).
| Symptom | Likely cause | What to do |
|---|---|---|
| Concat fails or transitions behave unexpectedly | Input streams may differ in codecs, layout, time bases, dimensions, frame rates or audio properties. | Check the source files and try the concat filter with encoding if the material needs normalization; test the real playlist. |
| Stream health warns about bitrate or video settings | The output may not match the YouTube recommendation for its codec, resolution or frame rate. | Confirm the actual encoded output, then use the matching row in YouTube’s current settings table. |
| YouTube does not receive the stream | The ingest URL or key may be incorrect, or the key may no longer be valid. | Copy the destination details again from Live Control Room. If the key was exposed, reset it. |
| Connection drops or health is unstable | Upload capacity or network stability may be insufficient. | Test upload speed, allow the recommended headroom and monitor stream health during a representative rehearsal. |
| A test looks fine on a static or silent clip, but the real playlist has problems | The rehearsal did not include representative motion or audio. | Repeat the test with representative sound and movement before starting the public stream. |
Or let it run in the cloud
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