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• Can't process RTP video stream from Firefox browser or Python based scripts by FFMPEG

  3 avril 2023, par Gentelam.S

  Any time I want to process (forward, analyze, copy, ...) RTP video stream from FF browser or python based scripts by FFMPEG, it "chucks" and can't work with it. Seems to be stream encoding issue.
I have a Janus server where clients join from browsers or anothers services, like Python, then I forward the stream to the URL, where FFMPEG is listening on. There is no issue when I try to process any forwarded stream coming from Chrome based browsers, but the problem occurs when I join from FF or Python.

  


  I run ffmpeg in Ubuntu container.
The command I use :
-loglevel trace -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp -i port4000.sdp -vf scale=1280:720 -vcodec libx264 -profile:v baseline -preset:v ultrafast -acodec aac -f flv -flvflags no_duration_filesize {{rtmpUrl}}

  


  I used also very simple commands like the following but the result is the same :
ffmpeg -protocol_whitelist file,udp,rtp -i ./SDP/port4000.sdp -c copy -t 10 -y test.mkv

  


  The SDP file I use :

  


  SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 58.29.100
m=video 4000 RTP/AVP 96
b=AS:200
a=rtpmap:96 VP8/90000


  


  The screens below depicts how FFMPEG behaves in case of FF and Chrome (loglevel of ffmpeg set to trace).

  


  Firefox :
enter image description here

  


  Chrome :
enter image description here

  


  enter image description here

  


  enter image description here

  


  enter image description here

  


  It looks like it brokes after the following log : Before avformat_find_stream_info() pos: xxx

  


  (Same problem is if I try to run ffprobe)
Thank you for any suggestion.

  


  As described above, I tried quite a lot of of arguments running ffmpeg, different SDP files but seems to be not enough. I want the stream to be procced properly by FFMEPG.

  


• avfilter/af_biquads : add option for block based linear phase processing

  8 mai 2022, par Paul B Mahol

  avfilter/af_biquads : add option for block based linear phase processing
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/af_biquads.c

• Use FFMPEG driver in opencv

  9 janvier 2021, par user3313834

  I have a camera on my linuxbox it is working well :

  


  # $ ls -al /dev/video*
# crw-rw----+ 1 root video 81, 0 janv.  8 16:13 /dev/video0
# crw-rw----+ 1 root video 81, 1 janv.  8 16:13 /dev/video1
# $ groups
# adm cdrom sudo dip video plugdev lpadmin lxd sambashare docker libvirt


  


  From python with cv2 it work well with the default driver CAP_V4L2

  


  >>> from pathlib import Path
>>> import cv2
>>> print(cv2.VideoCapture(0, apiPreference=cv2.cv2.CAP_V4L2).isOpened())
True
>>>


  


  I would like to access it with the FFMPEG driver (no success) :

  


  >>> print(cv2.VideoCapture(0, apiPreference=cv2.CAP_FFMPEG).isOpened())
False
>>>


  


  From Python side the opencv look like to have the FFMPEG Driver :

  


    >>> cv2.__version__
  '4.4.0'
  >>> info = cv2.getBuildInformation()
  >>> video, parallel = info.index('Video'), info.index('Parallel')
  >>> print(info[video:parallel])
  Video I/O:
       DC1394:                      NO
       FFMPEG:                      YES
         avcodec:                   YES (58.109.100)
         avformat:                  YES (58.61.100)
         avutil:                    YES (56.60.100)
         swscale:                   YES (5.8.100)
         avresample:                NO
       GStreamer:                   NO
       v4l/v4l2:                    YES (linux/videodev2.h)
  >>>


  


  From Linux side look ok too :

  


  $ dpkg -l |grep -i opencv
ii  libopencv-core4.2:amd64                    4.2.0+dfsg-5                          amd64        computer vision core library
ii  libopencv-imgcodecs4.2:amd64               4.2.0+dfsg-5                          amd64        computer vision Image Codecs library
ii  libopencv-imgproc4.2:amd64                 4.2.0+dfsg-5                          amd64        computer vision Image Processing library
ii  libopencv-videoio4.2:amd64                 4.2.0+dfsg-5                          amd64        computer vision Video I/O library

$ dpkg -l |grep -i ffm
ii  ffmpeg                                     7:4.2.4-1ubuntu0.1                    amd64        Tools for transcoding, streaming and playing of multimedia files
ii  gstreamer1.0-libav:amd64                   1.16.2-2                              amd64        ffmpeg plugin for GStreamer
ii  libavcodec-extra:amd64                     7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library with extra codecs (metapackage)
ii  libavcodec-extra58:amd64                   7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library with additional de/encoders for audio/video codecs
ii  libavdevice58:amd64                        7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library for handling input and output devices - runtime files
ii  libavfilter7:amd64                         7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library containing media filters - runtime files
ii  libavformat58:amd64                        7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library with (de)muxers for multimedia containers - runtime files
ii  libavresample4:amd64                       7:4.2.4-1ubuntu0.1                    amd64        FFmpeg compatibility library for resampling - runtime files
ii  libavutil56:amd64                          7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library with functions for simplifying programming - runtime files
ii  libffmpegthumbnailer4v5                    2.1.1-0.2build2                       amd64        shared library for ffmpegthumbnailer
ii  libpostproc55:amd64                        7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library for post processing - runtime files
ii  libswresample3:amd64                       7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library for audio resampling, rematrixing etc. - runtime files
ii  libswscale5:amd64                          7:4.2.4-1ubuntu0.1                    amd64        FFmpeg library for image scaling and various conversions - runtime files
$