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For a conventional FFmpeg playlist on YouTube Live, use H.264 video with AAC audio and send it over RTMPS. Set constant bitrate (CBR) and a two-second keyframe interval; YouTube allows no more than four seconds. Choose resolution, frame rate and bitrate to suit YouTube’s current encoder guidance and your upload connection. For a playlist, also check whether every file is compatible with FFmpeg’s concat demuxer: matching inputs can be stream-copied, while mismatched files may need normalization or re-encoding.
What “video format” means for a YouTube live stream
Three separate choices are often called a format: the file container (such as MP4), the audio and video codecs inside the stream, and the protocol used to send the stream to YouTube. Choosing an .mp4 extension alone does not make arbitrary source files compatible or determine the right live output.
- Container: How a file packages audio and video. It does not guarantee that its codecs or parameters match other playlist files.
- Codecs: The formats used to encode video and audio. For an ordinary RTMPS workflow, H.264 video and AAC audio are a conservative baseline.
- Ingest protocol: How the encoder delivers the live stream. YouTube recommends RTMPS for live ingestion.
YouTube’s encoder guidance also lists H.265 and AV1 video, and AAC or MP3 audio; its HLS guidance covers additional protocol-specific support. Do not assume every listed codec applies to every protocol or use case. HDR has separate requirements. Check YouTube’s live encoder settings for the current supported options.
Prepare the playlist before choosing stream copy
FFmpeg’s concat demuxer can join files without re-encoding when their streams meet its compatibility requirements. Compare each file before relying on stream copy. Useful parameters to inspect include video and audio codecs, dimensions, frame rate and time base, pixel format, audio sample rate, and channel layout. FFmpeg documents the concat demuxer and its requirements in its FAQ and formats documentation.
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If the inputs match
Stream copy avoids decoding and re-encoding the media, but it is suitable only when the inputs meet concat’s requirements and the resulting stream is acceptable to YouTube. Verify the actual files and test transitions; compatibility alone does not establish that every boundary will play seamlessly.
If the inputs do not match
Normalize or re-encode the files to a common stream configuration, or use a filter-based concatenation workflow. This adds processing work, but avoids treating mismatched streams as if they were interchangeable. The right workflow depends on the files and the FFmpeg version installed; test the complete playlist rather than assuming a generic command will handle every source.
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Set the live output for YouTube
For standard SDR streaming over RTMPS, use H.264 video and AAC audio as the baseline, with progressive scan, square pixels and CBR. YouTube recommends a two-second keyframe frequency and sets a four-second maximum. Its guidance recommends 44.1 kHz for stereo AAC or MP3 and 128 Kbps stereo audio. For SDR, it recommends Rec. 709 and 8-bit video. These are YouTube’s published encoder recommendations, not guarantees of stream quality or uninterrupted delivery.
Select output resolution, frame rate and video bitrate together: they must fit the intended YouTube stream settings and the capacity of the upload connection. Check the current bitrate table on YouTube’s encoder settings page rather than relying on a fixed figure; the appropriate bitrate varies with resolution and frame rate, and the table may change. Leave reliable network headroom instead of setting the stream at the maximum your connection can only briefly reach.
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RTMPS or HLS?
YouTube calls RTMPS “a secure extension to the popular RTMP streaming video protocol” and recommends it for YouTube Live. For a conventional continuous FFmpeg stream, it is the straightforward baseline when the encoder supports it.
HLS is a separate ingestion option, not just another name for RTMPS. It has higher latency because it sends segments, and YouTube specifies implementation requirements including TS segments lasting one to four seconds, a rolling playlist with no more than five outstanding segments, HTTPS POST/PUT, and no byte ranges. Choose HLS when its protocol or codec capabilities fit the use case and your encoder can meet those requirements; see YouTube’s HLS guidance.
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HDR is a separate case
Do not apply the SDR baseline blindly to HDR. YouTube recommends H.265 over RTMP(S) for HDR and points to HLS as an option when an encoder lacks the necessary RTMP capabilities. Confirm the current HDR requirements and encoder support in YouTube’s live settings guidance before configuring the output.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Configure the YouTube ingest credentials
Get the ingestion URL and stream key from YouTube Live Control Room or the applicable Live API setup. Depending on the encoder, the server URL and key may be entered in separate fields or combined. Follow the fields and format expected by the FFmpeg build and YouTube setup you are using; the API documentation explains that the URL and stream name may be separate or combined: YouTube Live API liveStreams documentation.
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Treat the stream key as a password: do not publish it, commit it into a public script or share it in logs. If it is exposed, replace or reset it in YouTube’s live settings and update the encoder configuration.
Test the full playlist before leaving it live
- Inspect every source file. Compare its video and audio parameters with the other playlist entries and decide whether stream copy is appropriate or normalization is needed.
- Build the exact output configuration. Set the intended codecs, CBR, progressive scan, square pixels, keyframe interval, audio settings, resolution and frame rate. Use YouTube’s current bitrate guidance and check that your connection can sustain the selected output.
- Run a representative test. Include audio and motion similar to the planned stream, and test the actual playlist across file boundaries. Listen for audio interruptions and watch for visual glitches or unexpected gaps.
- Check YouTube stream health. Monitor Live Control Room warnings and stream health while testing and during the live run. A command template or successful connection does not prove that a long-running playlist will remain healthy.
- Plan for process and network failure. Continuous operation depends on the source files, FFmpeg build and configuration, compute capacity, network stability and YouTube’s current ingestion behavior. Arrange monitoring and a way to restart or investigate the process if it exits or the stream degrades.
Troubleshoot common playlist-stream problems
| Symptom | Likely area to check | Next step |
|---|---|---|
| Concat fails or a file plays incorrectly | Input streams may not meet concat compatibility requirements. | Compare codecs, dimensions, frame rate/time base, pixel format, sample rate and channel layout. Normalize or re-encode incompatible inputs, then test the playlist again. |
| Glitch, gap or audio change at a file boundary | The individual files may concatenate but not transition cleanly in practice. | Test each transition in the actual playlist and inspect or listen to the affected files. Do not assume the concat method guarantees gapless playback. |
| YouTube reports stream health warnings | Output settings, upload stability or encoder performance may not match the intended stream. | Check the Live Control Room message, compare output settings with YouTube’s current guidance and test whether the upload can sustain the selected stream reliably. |
| Connection does not ingest | Protocol, ingestion URL or stream key may be entered incorrectly or in the wrong field format. | Confirm RTMPS or the intended protocol, copy the current URL and key from YouTube, and check whether FFmpeg expects separate fields or a combined value. |
| Stream stops after running for a while | The FFmpeg process, host, network or YouTube ingest may have failed. | Review process and host monitoring alongside YouTube’s stream messages, then test recovery using the same playlist and configuration before relying on unattended operation. |
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