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FFmpeg handles the media and playlist sequencing; SRS can receive an RTMP stream and, when configured, launch FFmpeg to transcode it; YouTube Live receives the final output at the server URL and stream key shown in your Live Control Room. SRS’s archived v4 ingest guide says its file input accepts one input, not a file list, so do not expect SRS itself to sequence a playlist. For a playlist, have FFmpeg or a script advance through files, then route the resulting stream through the SRS architecture you choose.
Choose what will sequence the playlist
There are two distinct jobs: deciding which file plays next, and encoding the outgoing video and audio. SRS’s archived v4 ingest guide explicitly says, “SRS does not ingest a file list.” It recommends using a script as the ingest tool and having FFmpeg publish files to RTMP one by one: SRS v4 ingest documentation. That page also says SRS adds FFmpeg’s -re option when the input is a file. This does not establish support for a multi-file playlist or guarantee that the archived behavior is unchanged in newer releases.
- Script advances files: use a script to publish each item sequentially when the playlist is a set of separate files. Decide explicitly what should happen at end of list, between items, and if a file fails.
- FFmpeg reads a playlist input: this may suit a prepared input list, but the supplied SRS documentation does not verify one universal looping concat command. Validate the exact playlist format, FFmpeg build, media files, transitions, and loop behavior before relying on it.
Do not describe the result as an SRS playlist feature: the cited SRS guide documents a single input and a script workaround, not native file-list ingestion.
Decide where transcoding happens
Transcoding is not automatically required just because the stream passes through SRS. If the source audio and video already meet your output requirements and the chosen path supports it, stream copy/remux avoids encoding again. Re-encode when you need to change codecs, dimensions, frame rate, bitrate, audio settings, or apply filters.
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The SRS v6 stable FFmpeg guide describes this flow: an encoder publishes RTMP to SRS; when configured, SRS forks FFmpeg; that FFmpeg process sends the resulting stream to SRS or another server. Its configuration covers codec, video and audio bitrate, frame rate, dimensions, profile/preset, sample rate, channels, and filters. It also documents copy modes: SRS v6 FFmpeg documentation. Confirm the syntax for your installed SRS release rather than copying a configuration across versions without checking it.
- Encode before SRS: FFmpeg owns output encoding settings before it publishes to SRS. This is a straightforward way to make the output match YouTube’s requirements.
- Let SRS fork FFmpeg: configure SRS to launch the transcoder after ingest. This separates the ingest publisher from the transcoding process, but does not eliminate encoding workload; the machine running that FFmpeg process must handle it.
- Copy/remux: avoid a new encode when source streams are suitable. This preserves the source encoding rather than correcting unsuitable source settings.
SRS’s v6 guide distinguishes bitrate units: generated FFmpeg command parameters use bits per second, while SRS configuration bitrate values are expressed in kilobits per second. Check units when translating a value between the two.
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Set YouTube’s output requirements
Use YouTube’s current encoder guidance for the target resolution and frame rate; do not reuse a bitrate from an SRS example as if it were a universal YouTube setting. YouTube lists RTMP/RTMPS ingest, constant bitrate (CBR), H.264, H.265, or AV1 video, up to 60 fps, and AAC or MP3 audio. It recommends RTMPS for encrypted ingest. See YouTube Help: Choose live encoder settings, bitrates, and resolutions.
- Keyframes: YouTube recommends a 2-second keyframe interval and says not to exceed 4 seconds.
- 1080p at 30 fps, H.264: YouTube lists 5 Mbps minimum and 14 Mbps recommended. Choose the row matching your actual output rather than treating these figures as universal.
- Stereo audio: YouTube recommends AAC at 44.1 kHz and 128 kbps in its advanced settings guidance.
- Connection capacity: allow for a reliable upload connection at the selected output settings. These platform recommendations are not guarantees of quality on a particular source or network.
SRS’s RTMP guide discusses RTMP publishing compatibility and includes RTMP/RTMPS examples, but the surfaced guide is marked v7 unstable. Prefer the secure ingest URL YouTube provides where available, and confirm that the exact SRS and FFmpeg versions and route you use support it: SRS v7 RTMP documentation. The YouTube server URL and stream key come from your Live Control Room, not from the SRS example endpoint.
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Configure the route from FFmpeg through SRS to YouTube
The local SRS getting-started example shows FFmpeg publishing a file to an SRS RTMP endpoint using rtmp://localhost/live/livestream. It demonstrates the local endpoint shape only; it is not a YouTube credential or a production-ready playlist command: SRS getting started.
- Install and start SRS. Use the instructions and configuration for the release you have installed. Confirm that the RTMP application and stream endpoint you intend to publish to are enabled and reachable from the FFmpeg process.
- Prepare playlist sequencing. Choose a script that advances separate files, or a tested FFmpeg playlist input. Decide and test what happens at the end of the list, between files, and after a failed read. SRS’s archived ingest documentation does not establish native list playback.
- Choose copy or encode. If no output changes are needed and the media is compatible, use a copy/remux path. Otherwise configure FFmpeg encoding either before SRS or through SRS’s documented transcoding workflow. Set the output resolution, frame rate, codec, CBR video bitrate, keyframe interval, and audio format to match the applicable YouTube guidance.
- Publish into SRS. Use the RTMP endpoint configured for your SRS instance. The getting-started command is an example for a local file and local SRS only; adapt the endpoint and input arrangement to your chosen playlist method.
- Set the YouTube destination. In YouTube Live Control Room, obtain the live server URL and stream key, then configure the final publishing output to use them. YouTube’s setup guide explains entering these values in an encoder: YouTube Help: Set up your encoder for live streaming. Keep the key private; never put a real key in a public command, configuration file, screenshot, or log.
- Test and monitor. Test with representative motion and audio before the stream, then check YouTube stream health and messages during the event. YouTube Help says, “Make sure to test before you start your live stream,” and advises monitoring stream health and reviewing messages during the event.
Whether SRS is the final publisher to YouTube or FFmpeg publishes the final output directly depends on the architecture you configure. SRS v6 documents its transcoder sending output to SRS or another server; do not assume a particular output route without configuring and testing it.
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Common failures and practical checks
- The playlist stops after one file: SRS is not advancing a file list. Put sequencing in a script or a verified FFmpeg playlist input, then test end-of-list behavior.
- SRS accepts the input but YouTube does not: check the final output codec, bitrate mode, keyframe interval, audio format, and resolution/frame-rate row against YouTube’s encoder settings. Also confirm that the destination URL and stream key are current.
- The outgoing quality is unsuitable: copying preserves source encoding rather than fixing it. Re-encode when the source does not meet the required output settings.
- Bitrate is off by a factor of 1,000: check whether the value is an FFmpeg command parameter in bps or an SRS configuration value in kbps.
- Secure ingest fails: check that YouTube’s RTMPS URL is being used where available and that the specific SRS/FFmpeg route and versions support it. Do not silently substitute an unencrypted endpoint when secure ingest is required.
- Playback is unreliable despite correct settings: test the real files and representative motion/audio, check upload capacity for the selected output, and use YouTube’s stream-health messages to narrow down the problem.
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