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2. A stream published to one of Origin servers should be played on the same Origin server or any Edge server (through Transcoder server if necessary), but should not be played from another Origin server in the same CDN.
Known issues
1. When FFmpeg based encoder is used, there can be distortions (macroblocks) in first frames of stream transcoded
Symptoms: viewer sees macroblocks in first frames when transcoding profiles is used
Solution:
a) Set quality parameter in transcoding profile
Code Block | ||||
---|---|---|---|---|
| ||||
profiles:
-240p:
audio:
codec : opus
rate : 48000
video:
height : 240
gop : 50
fps : 25
codec : h264
preset : veryfast
quality : 25
codecImpl : FF |
b) use OpenH264 encoder if it is necessary to keep videbitrate specified
Code Block | ||||
---|---|---|---|---|
| ||||
profiles:
-240p:
audio:
codec : opus
rate : 48000
video:
height : 240
bitrate : 400
gop : 50
fps : 25
codec : h264
codecImpl : OPENH264 |