Recherche avancée

Sur d’autres sites (5542)

• ffplay / OpenFrameworks / AR Parrot Drone / TCP video

  13 janvier 2014, par gabriella

  I can get a video stream coming from AR parrot 2.0 drone by running "ffplay tcp ://192.168.1.1:5555"
  But I'm trying to get this video stream into OpenFrameworks.

  1. is there a way to figure out how to pipe this video into OF ?
  2. Can I make this ffplay call directly in OF so the video is in the OF app by default ?

  there is no ffmpeg module for OpenFrameworks that I know of.
  Thanks

• FFMPEG : Redirecting Matroska muxed data to socket

  14 août 2016, par Parth Shah

  I am using FFMPEG library to mux H.264 and AAC frames to Matroska (.mkv) file. I can do that both using command line and C program.

  Now, instead of writing the muxed matroska data in to file I want to write these muxed data directly on to socket or pipe. My actual goal is to write a C program that send muxed data to socket and server will receive this muxed data.

  I tried using protocol tcp. They are working with the matroska format.
  So, My C program is able to send muxed data successfully over socket and server is able to receive this muxed data.

  But when I apply ffprobe command over the received file, I am getting duration and bitrate field N/A. and when I tried to play this file with vlc i am unable to seek the file and getting garbage duration.

  Below the output of the ffprobe.

  ffprobe version N-65784-g50a35f0 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Aug 25 2014 12:31:36 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  
    configuration: 
  
    libavutil      54.  5.100 / 54.  5.100
  
    libavcodec     56.  0.101 / 56.  0.101
  
    libavformat    56.  1.100 / 56.  1.100
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  0.101 /  5.  0.101
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
  Input #0, matroska,webm, from 'Array.mkv':
  
    Metadata:
  
      ENCODER         : Lavf54.29.104
  
    Duration: N/A, start: 1412858260.281000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:2: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:3: Video: mjpeg, yuvj422p(pc, bt470bg), 2000x1496 [SAR 1:1 DAR 250:187], 27 fps, 27 tbr, 1k tbn, 1k tbc (default)

  As You can see Duration and Bitrate field shows N/A. However I am getting correct startTime.

  Any help or advice ? Thank you in advance.

• Run ffmpeg without outputting configuration information ?

  28 mars 2014, par Matt Joiner

  I'm invoking ffmpeg with subprocess.Popen, and trying to capture the stderr output and write it to logging.

  args = ['ffmpeg', '-i', path]
  
  if start:
  
      args += ['-ss', start]
  
  if end:
  
      args += ['-t', end]
  
  args += [
  
      '-vcodec', 'copy',
  
      '-acodec', 'copy',
  
      '-scodec', 'copy',
  
      '-f', 'mpegts',
  
      '-y', '/dev/stdout']
  
  self.child = subprocess.Popen(
  
      args,
  
      stdin=open(os.devnull, 'rb'),
  
      stdout=subprocess.PIPE,
  
      stderr=subprocess.PIPE)

  ffmpeg generates a lot of configuration information like the following :

  FFmpeg version 0.6.2-4:0.6.2-1ubuntu1,
  Copyright (c) 2000-2010 the Libav
  developers built on Mar 22 2011
  15:55:04 with gcc 4.5.2
  configuration :
  —extra-version=4:0.6.2-1ubuntu1 —prefix=/usr —enable-avfilter —enable-avfilter-lavf —enable-vdpau —enable-bzlib —enable-libgsm —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-pthreads —enable-zlib —enable-libvpx —disable-stripping —enable-runtime-cpudetect —enable-vaapi —enable-gpl —enable-postproc —enable-swscale —enable-x11grab —enable-libdc1394 —enable-shared —disable-static WARNING : library configuration
  mismatch libavutil configuration :
  —extra-version=4:0.6.2-1ubuntu2 —prefix=/usr —enable-avfilter —enable-avfilter-lavf —enable-vdpau —enable-bzlib —enable-libdirac —enable-libgsm —enable-libopenjpeg —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-pthreads —enable-zlib —enable-libvpx —disable-stripping —enable-runtime-cpudetect —enable-vaapi —enable-libopenjpeg —enable-gpl —enable-postproc —enable-swscale —enable-x11grab —enable-libfaad —enable-libdirac —enable-libfaad —enable-libmp3lame —enable-librtmp —enable-libx264 —enable-libxvid —enable-libdc1394 —enable-shared —disable-static libavcodec configuration :
  —extra-version=4:0.6.2-1ubuntu2 —prefix=/usr —enable-avfilter —enable-avfilter-lavf —enable-vdpau —enable-bzlib —enable-libdirac —enable-libgsm —enable-libopenjpeg —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-pthreads —enable-zlib —enable-libvpx —disable-stripping —enable-runtime-cpudetect —enable-vaapi —enable-libopenjpeg —enable-gpl —enable-postproc —enable-swscale —enable-x11grab —enable-libfaad —enable-libdirac —enable-libfaad —enable-libmp3lame —enable-librtmp —enable-libx264 —enable-libxvid —enable-libdc1394 —enable-shared —disable-static libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0

  Prior to finally outputting the stuff I'd like to log :

  Seems stream 0 codec frame rate
  differs from container frame rate :
  47.95 (66893/1395) -> 23.98 (66893/2790) At least one output file
  must be specified

  Is there an option to prevent this excessive output ? Should I be doing it differently ?