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• How can I convert a mp4 into an ogv with ffmpeg ? I am getting a "segmentation fault"

  8 mars 2020, par xrainbowuk

  I am trying to use ffmpeg to convert a mp4 video into an ogv and a webm. I am using a Mac and this is what I am putting into the terminal :

  ffmpeg -i "Hands-typing-(mobile-1080p-loop) copy.mp4" -codec:v libtheora -codec:a libvorbis -f ogv output.ogv

  This is what I am getting in response :

      ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Hands-typing-(mobile-1080p-loop) copy.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2020-03-04T20:14:21.000000Z
  
    Duration: 00:00:21.18, start: 0.000000, bitrate: 8201 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 8085 kb/s, 30 fps, 30 tbr, 30k tbn, 60k tbc (default)
  
      Metadata:
  
        creation_time   : 2020-03-04T20:14:21.000000Z
  
        handler_name    : ?Mainconcept Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        creation_time   : 2020-03-04T20:14:21.000000Z
  
        handler_name    : #Mainconcept MP4 Sound Media Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> theora (libtheora))
  
    Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))
  
  Press [q] to stop, [?] for help
  
  zsh: segmentation fault  ffmpeg -i "Hands-typing-(mobile-1080p-loop) copy.mp4" -codec:v libtheora   -f

  I have also tried this, which doesn’t work :

  ffmpeg -i "Hands-typing-(mobile-1080p-loop) copy.mp4" -codec:v libtheora -qscale:v 3 -codec:a libvorbis \
  
    -qscale:a 3 -f ogv output.ogv

  I am struggling to find the answer to my question. Especially as there are so many posts about "segmentation faults".

  Any help is very much appreciated.

• ffmpeg with python subprocess Popen

  17 juillet 2022, par Eular

  I'm trying to record webcam video from python using ffmpeg. The following ffmpeg works properly when run from the cmd

  


  ffmpeg -f dshow -rtbufsize 2000M -i video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)" -y -vcodec libx264 -crf 24 output.mp4 


  


  I have checked the audio and video inputs with

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  Now when I try to call the command using subprocess problem happens. I can just pass the whole command like this

  


  import subprocess, time
recorder = subprocess.Popen('ffmpeg -f dshow -rtbufsize 2000M -i video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)" -y -vcodec libx264 -crf 24 output.mp4', shell=True)
time.sleep(10)
recorder.terminate()
recorder.kill()


  


  Now, as this is run with shell=True this won't terminate the recording and I have checked different solution, but they won't work either. So, I opted for shell=False. I tried with

  


  recorder = subprocess.Popen(['ffmpeg', '-f', 'dshow', '-rtbufsize', '2000M', '-t', '60', '-i', 'video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)"', '-y', '-vcodec', 'libx264', '-crf', '24', 'output.mp4'],shell=False)


  


  This throws the error

  


  [dshow @ 0000024f2becd540] Could not find video device with name ["HP HD Camera"] among source devices of type video.
video="HP HD Camera":audio="Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)": I/O error


  


  Then, I tried

  


  recorder = subprocess.Popen(['ffmpeg', '-f', 'dshow', '-rtbufsize', '2000M', '-t', '60', '-i', 'video=HP HD Camera:audio=Headset (realme Buds Wireless 2 Neo Hands-Free AG Audio)', '-y', '-vcodec', 'libx264', '-crf', '24', 'output.mp4'],shell=False)


  


  This creates the output, but the video is not playable.
  
How to fix this ?

  


• Can use AVCaptureMoiveFileOutput send stream video to the Network ?

  18 avril 2016, par X.Rodi

  I need to send screen video in real-time from Mac to a multicast group,like"239.1.1.110:46110".

  I know the AVCaptureMovieFileOutput has a method"startRecordingToOutputFileURL : recordingDelegate :".

  I just want to know the parameter of URL can be a multicast group address ? Or if is no,what can I do to send the stream video to the multicast group ?

  Someone said using ffmpeg,but I nothing about that.Could anybody give some sample demo ?

  Any help is appreciated.Thanks a lat in advance.