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If there are two profiles with the same name in the setup, server will use only the last profile with the same name.
Force transcoding of a maximum ABR quality only if there are B-frames in a source stream
To reduce a server load while video encoding, since WCS build 5.2.1840 it is possible to transcode a maximum ABR quality (which is usually the original stream resolution and bitrate) only if there are B-frames in a source stream. The feature may be enabled by the following parameter
| Code Block | ||
|---|---|---|
| ||
h264_b_frames_force_transcoding=true |
In this case the server will detect B-frames in a stream analizing a certain frames count (10 by default)
| Code Block | ||
|---|---|---|
| ||
frame_cnt_to_determine_their_type=10 |
If there are B-frames in the stream, the maximum ABR quality will be transcoded and will be available for playback in the HLS manifest
| Code Block | ||
|---|---|---|
| ||
#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=1000000,RESOLUTION=640x360,CODECS="avc1.42e01f,mp4a.40.2"
360/360.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=2000000,RESOLUTION=1280x720,CODECS="avc1.42e01f,mp4a.40.2"
720/720.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=2500000,RESOLUTION=1920x1080,CODECS="avc1.42e01f,mp4a.40.2"
1080/1080.m3u8 |
If there are no B-frames in the stream, the maximum ABR quality will not be transcoded
| Code Block | ||
|---|---|---|
| ||
#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=1000000,RESOLUTION=640x360,CODECS="avc1.42e01f,mp4a.40.2"
360/360.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=2000000,RESOLUTION=1280x720,CODECS="avc1.42e01f,mp4a.40.2"
720/720.m3u8 |
The original quality should be requested separately from a playing client.
| Warning |
|---|
Currently, the feature is supported for a single node HLS ABR and WebRTC ABR |
Maximum playlist size
Maximum playlist size in segments is defined by the following parameter
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