Recherche avancée

Sur d’autres sites (12695)

• FFmpeg not decreasing

  19 avril 2018, par David

  I need ffmpeg to transform a video stream into images and reduce their size only if they don’t fit in a 1000x1000 box.

  My issue is that if the image is smaller, ffmpeg increases the size of the image to 1000 in width or height, whereas I don’t want small images to be upscaled. The force_original_aspect_ratio=decrease does not seem to work here. Any ideas why ?

  Here is my shell command :

  ffmpeg -i 'rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov' -r 5 -vf scale=w=1000:h=1000:force_original_aspect_ratio=decrease -f image2 -qscale:v 1 ./output_%01d.jpg

• ffmpeg command to merge two mp4 file is not working

  27 février 2018, par Arpit Pagaria

  Hi I am trying to merge two mp4 file using ffmpeg commad. I found below command from somewhere. I have copy this complete command and paste this in cmd. But got error "Error initiaNo such filter : ’\’.Error Initializing complex filters.Invalid argument". Please help me out how to run this command ?

  ffmpeg -i GYM_1.mp4 -i Snow_1.mp4 -filter_complex "\
  
  [0:v]setsar=1[0v]; \
  
  [1:v]scale=720:576:force_original_aspect_ratio=decrease,setsar=1,\
  
       pad=720:576:(ow-iw)/2:(oh-ih)/2[1v]; \
  
  [0v][0:a][1v][1:a]concat=n=2:v=1:a=1[outv][outa] \
  
  " -map "[outv]" -map "[outa]" \
  
  -c:v libx264 -crf 23 \
  
  ffmpeg1.mp4

• cliping a webm file using moviepy and ffmpeg parameters

  19 février 2015, par headdetective

  Using moviepy, I am trying to trim a section of a webm file like this :

  my_file.write_videofile(name, codec = 'libvpx')

  Of course, I have already defined the beginning and end of the clip, etc. The code is returning the segment I want, however, I am noticed a decrease in the quality of the file.
  I am not resizing or constraiing the file size anywhere, so I don’t understand why the clip has an inferior quality compared to the original.

  There are some parameters that I could play with, which I suspect are set as defaults in moviepy to speed of video manipulation, but the documentation of moviepy does not say anything about them :

  ffmpeg_params :

  Any additional ffmpeg parameters you would like to pass, as a list of
  terms, like [‘-option1’, ‘value1’, ‘-option2’, ‘value2’]

  Anybody outhere is familiar with the right parameters to keep the quality of the original file ? As an alternative, is anybody is familiar with any other library to trim webm files ?

  Below are two pics showing the difference in quality. The first one is a frame of the trimmed file, the second one is approximately the same frame, for the original file.

  

  

  Thank you