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• Combining Audio and Video file in python [duplicate]

  8 juin 2020, par yso

  I'm trying to understand how to us ffmpeg to combine video and audio files in python. I want to combine a .avi file and a .wav file to create a final .avi file. Is this the right approach ? I'm confused by the ffmpeg syntax.
Any help would be great.

  



  I was looking through this for help :
https://wiki.libav.org/Snippets/avconv#Combine_audio_and_video_file

  



  import ffmpeg
import subprocess

cmd = 'ffmpeg -i inputvideo.avi -i inputaudio.wav -c:v copy -c:a aac output_video_and audio.avi'
subprocess.call(cmd, shell=True)                                     # "Muxing Done
print('Muxing Done')


  


• h264 to mp4 using libavformat : howto do correctly ? [duplicate]

  20 février 2020, par Daniel

  I want to convert an h264 live stream to mp4 live stream (no files are used).

  I would like to use avformat to produce the same output as this command :

  ffmpeg -i CAMERARTSPLINK -c:v copy -an -movflags +frag_keyframe+empty_moov -f mp4 pipe:1

  pipe:1 means it will write to stdout where seek is not available. (i.e. ffmpeg is not able to change anything that it has wrote before)

  Here is my sample code using avformat.

  I created a wrapper class for the ffmpeg to store it’s output to file (with this method I still ensure that ffmpeg is not able to modify anything).

  Also I modified my sample to store the bytes it receives in writeOutput to file.

  However my code and ffmpeg creates very different mp4 data :

  • ffmpeg creates boxes : ftyp, moov, moof, mdat -> file is playable
  • my code creates boxes : ftyp, moov -> file is NOT playable
  • ffmpeg ftyp box : majorBrand = isom ; compatibleBrands = [isom, iso2, avc1, iso6, mp41]
  • my code ftype box : majorBrand = iso5 ; compatibleBrands = [iso6, mp41]
  • ffmpeg moov box’s size : 0, 0, 3, 76
  • my code moov box’s size : 0, 0, 0, 0

  How shall I change my code to write output with isom, and correct moov size ?

  Here is a jsfiddle of ffmpeg’s thumbcoil analysis.

  Here is a jsfiddle of my code’s thumbcoil analysis.

• What hardware can I use to convert MP4 files to MPEG2 transport streams ? All software solutions have failed

  30 avril 2014, par dsimms

  I have tried FFMPEG, as well as a number of other software encoders and converters. Nothing has worked so far.

  I have several MP4 files that I need to convert into MPEG2 transport streams to run on set top boxes. I’m hoping there is a hardware solution for this because all software solutions have failed. The output file doesn’t run reliably without jitters and corruption on screen.