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To change the resolution or bitrate sent from SRS to YouTube, SRS must be actively transcoding the video with FFmpeg. Set the transcoded output with SRS’s vwidth, vheight, vfps and vbitrate parameters, then configure YouTube’s ingest settings to match. If SRS is only forwarding or copying the incoming stream, it cannot change the encoded video; change the upstream encoder or add a transcoding step.
First determine whether SRS is transcoding or passing through
A resolution or bitrate setting only changes video when an encoder creates a new output. In a pass-through or stream-copy workflow, SRS forwards the existing encoded video, so its output dimensions and bitrate remain those set by the upstream encoder. To change them, either adjust that encoder or configure SRS to transcode with FFmpeg.
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SRS’s parameter mapping documents how its transcoding controls map to FFmpeg output settings: SRS v3 FFmpeg parameter mapping. SRS also documents using FFmpeg to transcode a live stream and send it to another RTMP server in its v4 Transcode Deploy documentation. These references describe particular documentation versions; confirm the syntax and behavior against the SRS release you have deployed rather than treating an older example as universal configuration.
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Set the SRS transcoded output
Choose dimensions and frame rate
For an active SRS/FFmpeg transcode, set vwidth and vheight to the output dimensions, and vfps to the output frame rate. Choose values that match the resolution and frame rate you intend to send to YouTube. Reducing the output resolution or frame rate may reduce the bandwidth needed for the outgoing stream, but it also changes the picture delivered to YouTube.
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Set bitrate and check its units
SRS documents vbitrate in kilobits per second (kbps); the corresponding FFmpeg bitrate setting is in bits per second (bps). Do not copy a number between the two interfaces without converting units. For example, a target of 10 Mbps corresponds to 10,000 kbps or 10,000,000 bps. Confirm how the specific SRS release and its FFmpeg command handle the parameter before deploying a change.
There is no single bitrate that suits every stream. The target depends on codec, resolution, frame rate, motion in the video, and the upload capacity and stability available between your SRS server and YouTube. Leave sufficient bandwidth headroom rather than planning to use the entire measured upload rate.
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Match the output to YouTube Live
YouTube recommends choosing resolution, frame rate and bitrate in the encoder. Its Help page says YouTube detects resolution and frame rate by default; manual resolution selection is available with a custom stream key and manual settings in Live Control Room. Set YouTube’s ingest selection to match the SRS output when using manual selection. See YouTube’s live encoder settings, bitrates and resolutions.
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| Codec and output | YouTube guidance | How to apply it |
|---|---|---|
| H.264, 1080p at 30 fps | 10 Mbps recommended ingest bitrate | Use as a reference when the SRS output is H.264 at 1080p30 and the server connection can sustain it reliably. |
| H.264, 1080p at 60 fps | 12 Mbps recommended ingest bitrate | Use for that resolution and frame rate, not as a general 1080p target. |
| H.264, 720p at 60 fps | 6 Mbps recommended ingest bitrate | Apply to 720p60 H.264 output. |
| H.264, 240p–720p at 30 fps | 4 Mbps recommended ingest bitrate | This range is the recommendation for the stated 30 fps range, not for 720p60. |
| AV1 or H.265, 1080p at 30 fps | 3–8 Mbps minimum–maximum guidance | This is a different codec-specific range, not the H.264 recommended value. |
| AV1 or H.265, 1080p at 60 fps | 4–10 Mbps minimum–maximum guidance | Keep this separate from YouTube’s H.264 recommendations. |
YouTube transcodes the incoming live stream into multiple formats for viewers. The resolution and bitrate you send are ingest settings; they do not mean every viewer receives that exact rendition.
Test before relying on the new settings
- Confirm the outgoing encode. Verify that SRS is running an FFmpeg transcode rather than stream copy, and check the actual output dimensions, frame rate, codec and bitrate.
- Check available server upload capacity. Make sure the sustained connection from the SRS server to YouTube can carry the selected bitrate reliably, with headroom for normal variation.
- Test representative content. YouTube recommends testing before going live. Include the kind of movement and audio expected in the real stream; a static picture alone may not expose encoding or connection problems.
- Monitor stream health in Live Control Room. Watch the ingest status while testing and during the event. If the stream is unstable, lower the output bitrate or resolution, or address the server’s network capacity before raising quality again.
Troubleshoot common mismatches
- The YouTube stream stays at the original resolution. SRS may be passing through the source rather than transcoding. Enable the FFmpeg transcode or change the upstream encoder, then verify the resulting output.
- The video looks soft despite a higher bitrate. A higher bitrate cannot restore detail lost in a lower-resolution source. Check the source dimensions, SRS output dimensions and frame rate, and whether the intended transcode is active.
- The connection drops or YouTube reports poor stream health. The outgoing bitrate may exceed stable upload capacity. Test the route from the SRS server to YouTube and reduce bitrate or resolution if needed; avoid treating a peak speed result as sustained capacity.
- The configured bitrate seems far too high or low. Check units. SRS documents
vbitratein kbps, while FFmpeg uses bps for the corresponding value. - YouTube selects an unexpected resolution. By default it detects resolution and frame rate. Confirm what SRS is actually sending; if you need manual resolution selection, use a custom stream key and the manual settings in Live Control Room.
- A copied configuration does not work on your server. SRS examples and parameter behavior are version-specific. Validate the syntax against the documentation for your deployed SRS release and inspect the FFmpeg command and output produced by that version.
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