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• ffserver configuration vs ffmpeg parameters

  7 janvier 2015, par bogdanioan.gabor

  I’m not understanding which is the priority when you’re setting movflags (and other parameters) in the ffmpeg, but also into the ffserver.
  Example :

  I have the ffserver configuration like that :

  Port 8080
  
  BindAddress 0.0.0.0
  
  MaxHTTPConnections 10
  
  MaxClients 10
  
  MaxBandwidth 40000
  
  
  
  <feed>
  
      File /tmp/feed.ffm
  
      Feed feed.ffm
  
  
  
      VideoCodec libx264
  
      AVOptionVideo flags +global_header
  
      AVOptionVideo movflags faststart+frag_key_frame+empty_moov
  
  
  
      NoAudio
  
  </feed>

  And the ffmpeg command :

  ffmpeg -rtsp_transport tcp -i "rtsp://x.x.x.x" -an -vcodec copy -movflags faststart+frag_keyframe+empty_moov "http://127.0.0.1:8080/feed.ffm"

  Questions :
  1. Which one has precedence : the parameters from the ffmpeg, or the one from ffserver.
  2. I’m using ffprobe for testing the stream which comes from ffserver. I’ve used faststart, but I’m still getting the "moov atom not found" error ; shouldn’t faststart flag move the moov atom to beginning ?

  More info :

  ffserver version :

  ffserver version 2.3.4 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Dec  4 2014 09:23:21 with gcc 4.8.2 (GCC) 20140120 (Red Hat 4.8.2-16)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
  libavutil      52. 92.100 / 52. 92.100
  
  libavcodec     55. 69.100 / 55. 69.100
  
  libavformat    55. 48.100 / 55. 48.100
  
  libavdevice    55. 13.102 / 55. 13.102
  
  libavfilter     4. 11.100 /  4. 11.100
  
  libavresample   1.  3.  0 /  1.  3.  0
  
  libswscale      2.  6.100 /  2.  6.100
  
  libswresample   0. 19.100 /  0. 19.100
  
  libpostproc    52.  3.100 / 52.  3.100

  ffmpeg version :

  ffmpeg version 2.3.4 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Dec  4 2014 09:23:21 with gcc 4.8.2 (GCC) 20140120 (Red Hat 4.8.2-16)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
  libavutil      52. 92.100 / 52. 92.100
  
  libavcodec     55. 69.100 / 55. 69.100
  
  libavformat    55. 48.100 / 55. 48.100
  
  libavdevice    55. 13.102 / 55. 13.102
  
  libavfilter     4. 11.100 /  4. 11.100
  
  libavresample   1.  3.  0 /  1.  3.  0
  
  libswscale      2.  6.100 /  2.  6.100
  
  libswresample   0. 19.100 /  0. 19.100
  
  libpostproc    52.  3.100 / 52.  3.100

  Thank you.

• Python Subprocess.Popen or os.popen

  21 septembre 2023, par Nowski

  hi I want to run a bash command in my script to process a file with ffmpeg, I am struggling to get it to work in subprocess or os

  


  I build my command from variables elsewhere in the script and the resulting string is a legit ffmpeg call :

  


  fcommand=(f'/usr/bin/ffmpeg -i   {inputf}  -b:a  128K -vn  {output_directory}{youtube_id}.mp3')

Print(fcommand)  result: /usr/bin/ffmpeg -i   /media/pi/VDRIVE/uploaded/gf23_pmc-speakers.mp4  -b:a  128K -vn  /media/pi/VDRIVE/audio/EN6_KfsEtdM.mp3

os.popen(fcommand)


  


  This works, sorta. - eg I can see the output from FFmpeg on the shell I am running my parent python script with (python3 myscript.py)

  


  However, the parent python script just pauses and doesnt do anything further.
So I tried :

  


  subprocess.Popen(fcommand)


  


  But now I get the python error :

  


  [Errno 2] No such file or directory: [Errno 2] No such file or directory: 'ffmpeg -i   /media/pi/VDRIVE/uploaded/gf23_pmc-speakers.mp4  -b:a  128K -vn  /media/pi/VDRIVE/audio/EN6_KfsEtdM.mp3': 'ffmpeg -i   /media/pi/VDRIVE/uploaded/gf23_pmc-speakers.mp4  -b:a  128K -vn  /media/pi/VDRIVE/audio/EN6_KfsEtdM.mp3'


  


  My aim is to have the Python script run, make the file from FFMPEG input then move on to another step in the script.
Bashing my head against the wall here...

  


• FFMPEG FDKAAC and Python

  3 avril 2024, par Eric Barker

  Been banging my head against the wall for days on this. I'm writing a python program to take a 48kHz WAV file, convert it to 44.1kHz and encode it to HE-AAC via FDKAAC. FDK cannot convert to sample rates, so I'm using FFMPEG as the wrapper and piping it through FDKAAC. In a perfect world, I'd make a custom build of FFMPEG with FKD, but I've run into loads of issues on our Windows Server 2019 machine trying to build out FFMPEG, so I'm using vanilla FFMPEG with FDK piped in.

  


  I can get the command to work perfectly from a command prompt :

  


  ffmpeg -progress pipe:2 -i  -f wav -ar 44100 - | fdkaac -p 5 -b 64000 -o 


  


  But when I try to split it in Python for a Popen, it tries to evaluate the arguments and fails because ffmpeg doesn't have a "-p" argument :

  


  cmd = ['ffmpeg', '-progress', 'pipe:2', '-i', inFile, \
    '-f', 'wav', '-ar', '44100', '-', '|', \
    'fdkaac', '-p', '5', '-b', '64000', '-o', outFile]
fdkProcess = subprocess.Popen(cmd,
            stdout=subprocess.PIPE,
            universal_newlines=True)
for line in fdkProcess.stdout:
    print(line)


  


  RESULT :

  


  Unrecognized option 'p'.
Error splitting the argument list: Option not found


  


  I'll admit, I don't fully understand the pipeline process, and how to split commands via the "|" flag, and have them properly feed into stdout for the subprocess function to work correctly. I'm fairly new to python, and very new to programmatically capturing the output of a process like ffmpeg.