Recherche avancée

Sur d’autres sites (13121)

• FFMPEG Segment Threads Equivalent Option

  24 août 2018, par Bruno Andrade

  I was downloading video from a hls m3u8 stream using the ffmpeg command in php :

  exec('ffmpeg -hide_banner -loglevel verbose -n -i https://example.com/playlist.m3u8 -acodec copy -bsf:a aac_adtstoasc -vcodec copy file.mp4 1> log.txt  2>&1', $output, $var);

  But I was having problems downloading speed and the problem was not the internet.

  So I installed and used the livestreamer.io OR streamlink.github.io/ and also slowed down the download.

  So I made use of the hls-segment-threads=5 option according to the API document :

  The size of the thread pool used to download segments.

  This solved the problem, is there any equivalent option in the FFMPEG ?
  Or have something I can do with PHP + FFMPEG to get this result that this hls-segment-threads option provides ?

  Most shared servers come with FFMPEG installed but the same does not fit with livestreamer or streamlink so I need a solution that works for everyone.

  *I do not understand python do not know what this option exactly does

• FFmpeg eq filter equivalent value for css filter

  27 juillet 2018, par Praveen Tamil

  I’m showing the image with css filter applied in browser to how the output will be look like after processing.

  But the css filter accept the value in form of percent for contrast, brightness, saturation.
  But the ffmpeg’s eq filter is totally different and even more gamma params are used.

  I applied following filter in browser side

  filter: brightness(50%) contrast(100%) saturate(100%);
  
  filter: brightness(100%) contrast(100%) saturate(50%);
  
  filter: brightness(120%) contrast(100%) saturate(125%);

  I don’t how to do mapping these values to FFmpeg eq filter.

  I know below is the default code

  eq=contrast=1:brightness=0:saturation=1:gamma=1:gamma_r=1:gamma_g=1:gamma_b=1:gamma_weight=1 

  I need equivalent value of FFmpeg’s eq filter for above mentioned CSS filters.
  And mapping value from CSS filter to eq filter.

  css filter ref : https://www.w3schools.com/cssref/css3_pr_filter.asp

• copy streams equivalent for yt-dlp (python)

  25 décembre 2024, par GDjkhp

  I need the -c:v copy -c:a copy counterpart of ffmpeg postprocessing for yt-dlp in python.

  


  The following code is how I convert videos which is really slow.

  


          # imagine options -> dict
        options.update({
            'postprocessors': [{
                'key': 'FFmpegVideoConvertor',
                'preferedformat': arg, # can be mp4, webm, etc.
            }]
        })