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Note that ffmpeg sends orientattion value but not angle itself.

Known issues

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4. Some RTMP functions does not supported and will be ignored:

  • FCSubscribe
  • FCPublish
  • FCUnpublish
  • onStatus
  • onUpstreamBase
  • releaseStream

5. Some RTMP-encoders does not support KeepAlive.

Symptoms: disconnection occurs often while stream publishing with RTMP-encoder.

Solution: switch KeepAlive off for RTMP on the server using the following parameter in flashphoner.properties file

Code Block
languagebash
themeRDark
keep_alive.enabled=websocket,rtmfp

7. When stream published with RTMP encoder is played as HLS, freezes may occur if GOP is not multiple of FPS of file published

Symptoms: freezes occur when RTMP stream is played as HLS

Solution: in RTMP encoder settings, assign GOP to value equal or multiple of FPS of file published. For example, when publishing file with FPS 25 set GOP to 50.

8. When stream published with RTMP encoder is played as WebRTC, stream audio has low quality

Symptoms: sound is good enogh for speech but not for music when RTMP is played as WebRTC

Solution: set Opus encoding bitrate as published one, for example

Code Block
themeRDark
opus.encoder.bitrate=160000

if RTMP stream is published with audio bitrate 160 kbps

9. High CPU load when stream H264+speex is published (for example, using Flash client) with audio transcoding

Symptoms: high CPU load while audio transcoding from speex to AAC or Opus

Solution: use native speex decoder implementation

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themeRDark

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Decoding buffer size management

When RTMP stream is published from software encoder supportin hardware acceleration on NVIDIA GPU, and contains B-frames, the stream picture can twitch in some RTMP or HLS players. To workaround this, since build 5.2.863 the parameter was added to set the maximum decoding buffer size passed in SPS

Code Block
themeRDark
h264_sps_max_dec_frame_buffering=-1

By default, buffer size is not limited. This eliminates picture twitching, but can inscrease latency due to excessive buffering. In this case, the buffer size can be limited to 2 frames (default value before build 5.2.863)

Code Block
themeRDark
h264_sps_max_dec_frame_buffering=2

or more frames to eliminate twitching without viewable latency.

Known issues

Excerpt Include
From another server via RTMP
From another server via RTMP
nopaneltrue

4. Some RTMP functions does not supported and will be ignored:

  • FCSubscribe
  • FCPublish
  • FCUnpublish
  • onStatus
  • onUpstreamBase
  • releaseStream

5. Some RTMP-encoders does not support KeepAlive.

Symptoms: disconnection occurs often while stream publishing with RTMP-encoder.

Solution: switch KeepAlive off for RTMP on the server using the following parameter in flashphoner.properties file

Code Block
languagebash
themeRDark
keep_alive.enabled=websocket,rtmfp

7. When stream published with RTMP encoder is played as HLS, freezes may occur if GOP is not multiple of FPS of file published

Symptoms: freezes occur when RTMP stream is played as HLS

Solution: in RTMP encoder settings, assign GOP to value equal or multiple of FPS of file published. For example, when publishing file with FPS 25 set GOP to 50.

8. When stream published with RTMP encoder is played as WebRTC, stream audio has low quality

Symptoms: sound is good enogh for speech but not for music when RTMP is played as WebRTC

Solution: set Opus encoding bitrate as published one, for example

Code Block
themeRDark
opus.encoder.bitrate=160000

if RTMP stream is published with audio bitrate 160 kbps

9. High CPU load when stream H264+speex is published (for example, using Flash client) with audio transcoding

Symptoms: high CPU load while audio transcoding from speex to AAC or Opus

Solution: use native speex decoder implementation

Code Block
themeRDark
use_speex_java_impl=false

10. Stream with unsupported codecs cannot be published

Symptoms: RTMP stream with MP3 or AC3 audio is not publishing with the following warnings in server log

Code Block
themeRDark
11:01:00,921 WARN         ServerHandler - RTMP-pool-15-thread-1 Codecs not supported! audio: NoCodec, video: NoCodec

Solution: reencode stream to supported codecs using corresponding encoder settings