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• Playing MP4 file in Powerpoint

  28 août 2014, par BrewGold

  I have a huge MP4 file (4GB) an hour long video. I want to extract port of the file. So I used the following command to extract 70 seconds(00:01:10) of video starting from 11 minutes

  ffmpeg -i INPUT.mp4 -ss 00:11:00 -t 00:01:10 -c:v copy -c:a copy OUTPUT.mp4

  Now I got a small file extracted from Input.MP4
  The output.mp4 file size is still big(90 MB). So I used the following command

  ffmpeg -i OUTPUT.mp4 -c:v libx264 -crf 30 SmallSizeVideo.avi

  I got SmallSizeVideo.avi file which is approximately 6MB.

  I am using Powerpoint 2010. I want to insert the video in Powerpoint and play.

  Unfortunately when I embed SmallSizeVideo.avi Powerpoint is unable to play

  1) Is my approach correct ?
  2) What is the best way to situation like me to play small portion of clips in powerpoint

  Thank you

• Creating .ts chunks from .mp4 file

  11 juin 2015, par kopalvich

  I need to create a .ts chunks from a .mp4 file without using ffmpeg API. I have already implemented this task using ffmpeg API, and it works, but my team lead wants me to get rid of it, and it is impossible to convince him against that. The code is supposed to run under load.

  I have already found out how to read mp4 format, where to find frames, their offsets and sizes in a file, their pts’s, for audio and video. A huge achievement for me as I haven’t been working in this area for long.

  All I managed is to create playlist where each chunk starts with I-frame. I feed the start and stop pts’s of playlist entry to the old code(slightly modified) using ffmpeg API, and it creates proper ts chunks.

  But but to create ts chunks without ffmpeg API I still cannot.

  At first I tried to read the code of nginx rtmp module, the hls part of it, but couldn’t understand anything there. It’s too complex and I lack specific knowledge.
  Now I’d like to read something on ts format. Can anyone advise where to look ?

  Thanks.

• Hide subprocess output and store it in a variable in Python [duplicate]

  6 juillet 2022, par Dev01

  I would like to call a FFmpeg command, which produces a very big output.

  


  I need to store the output in order to make a regex on it.

  


  On the first command (echo), nothing is printed in my terminal, but for the ffmpeg command, huge output is produced (which I want to store in a variable, I don't want to have the output in my terminal)

  


  So my code looks like this for example :

  


  import subprocess
output = subprocess.check_output("echo a lot of wooooords")
output = subprocess.check_output("ffmpeg -i audio.mp3 -f null -", shell=True)


  


  Is it possible to hide the output for this command ? Why does it show me an output ? Thank you