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• Silence in RTP stream in ffmpeg

  9 octobre 2020, par Odatia

  I am trying to record a webRTC stream. The stream is coming in in the OPUS codec, and is then being piped into ffmpeg for recording, using the -c:a copy flag. However, if there are missing packets, for example, if I mute my microphone (or even stay quiet for a short period), when the audio is played back (webm file), it jumps across these "silences".

  


  I have tried to use the DTX option to insert comfort noise, but my input is 4800MHz which is not supported.

  


  My full mpeg command is :

  


  ffmpeg -nostdin -protocol_whitelist file,rtp,udp -use_wallclock_as_timestamps 1 -fflags +genpts -i /tmp/sdpfilesfhmw4rymzy8wv25ybm610xte  -map 0:a:0 -c:a copy -f webm -flags +global_header -y ./server/lib/recording/test-icc-networks-xzsyoe1f.webm


  


  Any help would be appreciated !

  


  Thanks,
Joe

  


• Buid Exoplayer with ffmpeg extension

  22 février 2021, par Bhoomi Kalavadiya

  I'm making IP streaming android application. In which I'm using exoplayer 2.12.0. Input video is having mpeg-L2 audio layer codec which is not supported by exoplayer https://github.com/google/ExoPlayer/issues/6525. So i'm using ffmpeg extension to render audio.
  
I have followed https://github.com/google/ExoPlayer/tree/release-v2/extensions/ffmpeg steps to build ffmpeg extension with android-ndk-r21d-linux-x86_64 and FFmpeg-release-4.3.
  
Added code in the application
  
TrackSelector trackSelectors = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory()); RenderersFactory renderersFactory=new DefaultRenderersFactory(this,EXTENSION_RENDERER_MODE_ON,DEFAULT_ALLOWED_VIDEO_JOINING_TIME_MS); player = ExoPlayerFactory.newSimpleInstance(this, renderersFactory,trackSelectors);

  
Still audio is not coming and the log is as below
  
2020-12-01 05:05:10.803 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : videoEnabled [eventTime=1.39, mediaPos=0.00, window=0, period=0]
  
2020-12-01 05:05:10.808 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : tracks [eventTime=1.39, mediaPos=0.00, window=0, period=0, []]
  
2020-12-01 05:05:10.808 9161-9161/demo.demoapps.com.exoplayer2udpdemo I/MainActivity : onTracksChanged
  
2020-12-01 05:05:10.809 9161-9161/demo.demoapps.com.exoplayer2udpdemo I/MainActivity : 2
  
2020-12-01 05:05:10.809 9161-9161/demo.demoapps.com.exoplayer2udpdemo I/MainActivity : Format(2204/5204, null, null, video/mpeg2, null, -1, null, [720, 576, -1.0], [-1, -1])
  
2020-12-01 05:05:10.809 9161-9161/demo.demoapps.com.exoplayer2udpdemo I/MainActivity : Format(2204/6204, null, null, audio/mpeg-L2, null, -1, null, [-1, -1, -1.0], [2, 48000])
  
2020-12-01 05:05:10.813 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : downstreamFormat [eventTime=1.40, mediaPos=0.00, window=0, period=0, id=2204/5204, mimeType=video/mpeg2, res=720x576]
  
2020-12-01 05:05:10.827 9161-9219/demo.demoapps.com.exoplayer2udpdemo I/OMXClient : IOmx service obtained
  
2020-12-01 05:05:10.926 9161-9218/demo.demoapps.com.exoplayer2udpdemo D/SurfaceUtils : connecting to surface 0x6f5abb1010, reason connectToSurface
  
2020-12-01 05:05:10.928 9161-9218/demo.demoapps.com.exoplayer2udpdemo I/MediaCodec : [OMX.qcom.video.decoder.mpeg2] setting surface generation to 9380865
  
2020-12-01 05:05:10.928 9161-9218/demo.demoapps.com.exoplayer2udpdemo D/SurfaceUtils : disconnecting from surface 0x6f5abb1010, reason connectToSurface(reconnect)
  
2020-12-01 05:05:10.929 9161-9218/demo.demoapps.com.exoplayer2udpdemo D/SurfaceUtils : connecting to surface 0x6f5abb1010, reason connectToSurface(reconnect)
  
2020-12-01 05:05:10.941 9161-9219/demo.demoapps.com.exoplayer2udpdemo I/ExtendedACodec : setupVideoDecoder()
  
2020-12-01 05:05:10.950 9161-9219/demo.demoapps.com.exoplayer2udpdemo I/ExtendedACodec : Decoder will be in frame by frame mode
  
2020-12-01 05:05:10.995 9161-9219/demo.demoapps.com.exoplayer2udpdemo D/SurfaceUtils : set up nativeWindow 0x6f5abb1010 for 720x576, color 0x7fa30c06, rotation 0, usage 0x20002900
  
2020-12-01 05:05:11.014 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : videoDecoderInitialized [eventTime=1.60, mediaPos=0.00, window=0, period=0, OMX.qcom.video.decoder.mpeg2]
  
2020-12-01 05:05:11.015 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : videoInputFormat [eventTime=1.60, mediaPos=0.00, window=0, period=0, id=2204/5204, mimeType=video/mpeg2, res=720x576]
  
2020-12-01 05:05:11.060 9161-9219/demo.demoapps.com.exoplayer2udpdemo D/SurfaceUtils : set up nativeWindow 0x6f5abb1010 for 720x576, color 0x7fa30c06, rotation 0, usage 0x20002900
  
2020-12-01 05:05:11.101 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : videoSize [eventTime=1.69, mediaPos=0.00, window=0, period=0, 720, 576]
  
2020-12-01 05:05:11.153 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : surfaceSize [eventTime=1.74, mediaPos=0.00, window=0, period=0, 786, 590]
  
2020-12-01 05:05:11.180 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : renderedFirstFrame [eventTime=1.76, mediaPos=0.00, window=0, period=0, Surface(name=null)/@0x1c4f9a6]
  
2020-12-01 05:05:12.517 9161-9161/demo.demoapps.com.exoplayer2udpdemo I/MainActivity : onPlayerStateChanged : playWhenReady = true playbackState = 3
  
2020-12-01 05:05:12.517 9161-9161/demo.demoapps.com.exoplayer2udpdemo I/MainActivity : ExoPlayer ready ! pos :
  
2020-12-01 05:05:12.518 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : state [eventTime=3.10, mediaPos=0.00, window=0, period=0, READY]
  
2020-12-01 05:05:12.523 9161-9161/demo.demoapps.com.exoplayer2udpdemo D/EventLogger : isPlaying [eventTime=3.11, mediaPos=0.00, window=0, period=0, true]
  

  

  
Here, With or without ffmpeg extension, I'm not getting audioEnabled log in Eventlogger.
Also after using ffmpeg audio render, I'm not getting it is being used or not.
Or am I missing some configuration of ffmpeg extension to Exoplayer ?


• avcodec/mpeg12enc : Disallow using MPEG-2 intra VLC table for mpeg1video

  24 novembre 2020, par Andreas Rheinhardt

  avcodec/mpeg12enc : Disallow using MPEG-2 intra VLC table for mpeg1video
  Using MPEG-2 intra VLC tables is spec-incompliant for MPEG-1 and given
  
  that an MPEG-1 bitstream can't signal whether MPEG-2 intra VLC tables
  
  have been used the output is broken. Therefore this option is removed
  
  immediately without any deprecation period.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Reviewed-by : Marton Balint <cus@passwd.hu>
  
  Reviewed-by : Anton Khirnov <anton@khirnov.net>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/mpeg12enc.c