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• FFMPEG compression - Piping vs File [on hold]

  27 avril 2014, par raaj

  Good Day,

  I have written an application that uses the V4L2 driver to capture H264 Raw frames from a C920. The bytes are output into stdout, and can be piped to a file or any program

  What I am trying to do is this :

  ./capture | ffmpeg -f h264 -i - -b 500000 -vcodec copy out.mp4

  The idea is to capture a raw video and convert it to an mp4 file on the fly. It works perfectly, however, the bit rate compression is never applied. It ends up with a file the same size as the raw file (since the camera outputs a compressed h264 file but in raw frames already)

  However, if I was to do this instead

  ./cature > input.raw

  ffmpeg -i out.mp4 -b 500000 output.mp4

  Now, it compresses the file down to a reasonable size. Is there a reason for this ? My only current solution right now is to use an alternative like gstreamer (which has issues with h264) or to figure out the ffmpeg API and see if I can add some code to make it do compression on the frames on the fly.

• I can't use HW encoder of QSV by ffmpeg

  6 novembre 2017, par Ubunkun

  I would like to use to encode by Intel H/W encode QSV.

  Intel(R) Core(TM) i7-5650U CPU @ 2.20GHz

  lspci -nn -s 0:02.0
  00:02.0 VGA compatible controller [0300] : Intel Corporation Broadwell-U Integrated Graphics [8086:1626] (rev 09)

  I could install MediaServerStudioEssentials2017R2 and ffpemg.

  # vainfo | grep -v 'unknown'
  
  error: can't connect to X server!
  
  libva info: VA-API version 0.99.0
  
  libva info: va_getDriverName() returns 0
  
  libva info: User requested driver 'iHD'
  
  libva info: Trying to open /opt/intel/mediasdk/lib64/iHD_drv_video.so
  
  libva info: Found init function __vaDriverInit_0_32
  
  libva info: va_openDriver() returns 0
  
  vainfo: VA-API version: 0.99 (libva 1.67.0.pre1)
  
  vainfo: Driver version: 16.5.1.59511-ubit
  
  vainfo: Supported profile and entrypoints
  
        VAProfileH264ConstrainedBaseline: VAEntrypointVLD
  
        VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
  
        VAProfileH264Main               : VAEntrypointVLD
  
        VAProfileH264Main               : VAEntrypointEncSlice
  
        VAProfileH264High               : VAEntrypointVLD
  
        VAProfileH264High               : VAEntrypointEncSlice
  
        VAProfileMPEG2Simple            : VAEntrypointEncSlice
  
        VAProfileMPEG2Simple            : VAEntrypointVLD
  
        VAProfileMPEG2Main              : VAEntrypointEncSlice
  
        VAProfileMPEG2Main              : VAEntrypointVLD
  
        VAProfileVC1Advanced            : VAEntrypointVLD
  
        VAProfileVC1Main                : VAEntrypointVLD
  
        VAProfileVC1Simple              : VAEntrypointVLD
  
        VAProfileJPEGBaseline           : VAEntrypointVLD
  
        VAProfileJPEGBaseline           : VAEntrypointEncPicture
  
        VAProfileVP8Version0_3          : VAEntrypointEncSlice
  
        VAProfileVP8Version0_3          : VAEntrypointVLD
  
        VAProfileNone                   : VAEntrypointVideoProc

  and

  # ffmpeg -codecs | grep qsv
  
  ffmpeg version N-86584-g4976a34 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)
  
    configuration: --enable-libmfx
  
    libavutil      55. 66.100 / 55. 66.100
  
    libavcodec     57. 99.100 / 57. 99.100
  
    libavformat    57. 73.100 / 57. 73.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 94.100 /  6. 94.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_qsv h264_cuvid ) (encoders: h264_nvenc h264_qsv h264_vaapi nvenc nvenc_h264 )
  
   DEV.L. hevc                 H.265 / HEVC (High Efficiency Video Coding) (decoders: hevc hevc_qsv hevc_cuvid ) (encoders: nvenc_hevc hevc_nvenc hevc_qsv hevc_vaapi )
  
   DEV.L. mpeg2video           MPEG-2 video (decoders: mpeg2video mpegvideo mpeg2_qsv mpeg2_cuvid ) (encoders: mpeg2video mpeg2_qsv mpeg2_vaapi )
  
   D.V.L. vc1                  SMPTE VC-1 (decoders: vc1 vc1_qsv vc1_cuvid )
  
   DEV.L. vp8                  On2 VP8 (decoders: vp8 vp8_cuvid vp8_qsv ) (encoders: vp8_vaapi )

  But, I tried to encode as below.

  # ffmpeg -i test.avi -c:v h264_qsv -b:v 2000k -r 30 -s 720x480 -acodec copy -look_ahead 0 qsv.mp4
  
  ・・・
  
  [h264_qsv @ 0x3139f40] No device available for encoder (device type qsv for codec h264_qsv).
  
  [h264_qsv @ 0x3139f40] Encoder will work with partial HW acceleration
  
  [h264_qsv @ 0x3139f40] Warning in encoder initialization: partial acceleration (4)
  
  ・・・

  It seems like that the encoding is using by software. It’s slow.
  How can I do by H/W encode ? If you know it, let me know it.

  Bests,

• How to send RTP stream to Janus from NGINX RTMP module ? [closed]

  25 novembre 2024, par Matéo

  I'm trying to create a stream and display it in a browser. I have already configured NGINX with the rtmp module and my stream works very well with HLS (between 5 and 10 seconds of latency).

  


  Now I would like to set up a low-latency stream and that's why I have installed the janus-gateway webRTC server that allows to take in input an RTP stream and provide in output a webRTC stream.

  


  Here's the schema I'd like to follow :

  


  OBS -> RTMP -> Nginx-rtmp-module -> ffmpeg -> RTP -> Janus -> webRTC -> Browser

  


  But I have a problem with this part : "nginx-rtmp-module -> ffmpeg -> janus"

  


  In fact, my janus's server is running and demos streaming works very well in localhost, but when i try to provide an RTP stream, Janus don't detect the stream in the demos (it shows "No remote video available").

  


  Anyone can help me, please ?

  


  Ressources :

  


  

  • My janus.plugin.streaming.jcfg configuration :

  


  


  rtp-sample: {
        type = "rtp"
        id = 1
        description = "Opus/VP8 live stream coming from external source"
        metadata = "You can use this metadata section to put any info you want!"
        audio = true
        video = true
        audioport = 5002
        audiopt = 111
        audiortpmap = "opus/48000/2"
        videoport = 5004
        videopt = 100
        videortpmap = "VP8/90000"
        secret = "adminpwd"
}



  


  

  • My nginx.conf application :

  


  


  application test {

        deny play all;

        live on;
        on_publish http://localhost/test/backend/sec/live_auth.php;

        exec ffmpeg -i rtmp://localhost/test/$name -an -c:v copy -flags global_header -bsf dump_extra -f rtp rtp://localhost:5004;

}