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• FFMPEG loop video overlay

  12 avril 2013, par x1886x

  I have two videos, one of which is overlaid onto the other.The one that is overlaid is only a few seconds long, and I want it to keep looping whilst the main video plays. Ive tried everything I can think of , but nothing seems to work in ffmpeg

   ffmpeg -i mainVideo.MTS -vf " movie=overlaid.wmv  [overlay];[in][overlay] overlay=1000:500 [out]" output.mp4

  overlays one on top of the other , but with no looping.
  Changing movie=overlaid.wmv to movie=overlaid.wmv:loop=0

  gives me an error message

  [movie @ 01B19FC0] Key 'loop' not found.
  [movie @ 01B19F40] Error parsing options string : 'loop=0'
  Error initializing filter 'movie' with args 'overlaid.wmv:loop=0'
  Error opening filters !

  According to the ffmpeg docs, loop is a valid option for movie. Ive tried 0, 1, 10 as the loop value but the result is always the same (an error)

• How map_channel works in ffmpeg ?

  2 août 2020, par Redbraid

  I need to extract channels from 5.1 audios. These audio tracks are contained in a MKV file. Structure of "movie.mkv" file is like this :

  


  Input #0, matroska,webm, from 'movie.mkv':
  Duration: 00:40:38.08, start: 0.000000, bitrate: 21128 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x800 [SAR 1:1 DAR 12:5], 24 fps, 24 tbr, 1k tbn, 48 tbc
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:2(ger): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s
    Stream #0:3(eng): Subtitle: subrip


  


  But the syntax is very messy, so I did not figure out how to extract channels properly.

  


  This code, for the first audio track, works fine :

  


  ffmpeg -i "movie.mkv" -map_channel 0.1.0 "eng channel 1.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.1 "eng channel 2.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.2 "eng channel 3.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.3 "eng channel 4.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.4 "eng channel 5.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.5 "eng channel 6.wav"


  


  I believe that 0.1.0 is : input #0 (movie.mkv) ; then stream 1 (audio eng) ; then channel 0 (very first channel).

  


  But when I'm trying to extract channels from second audio track...

  


  ffmpeg -i "movie.mkv" -map_channel 0.2.0 "ger channel 1.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.1 "ger channel 2.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.2 "ger channel 3.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.3 "ger channel 4.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.4 "ger channel 5.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.5 "ger channel 6.wav"


  


  ...it extracts not German sound, but instead it results with the same eng channels (which also sound little louder than in previous case). In this code, 0.2.0 appears to be : input #0 (movie.mkv) ; then stream 2 (audio ger) ; then channel 0 (very first channel).

  


  So what am I doing wrong ? :-)

  


• Lib x : display problem related to window pixel color changes with the mlx_put_pixel() function [closed]

  15 janvier 2023, par Jordan Riga

  I'm stuck on a project that I have to return for school.
I have to make a 3D game with the minilibx in C, the problem being that I try to make the graphic part work but it doesn't work (display pixels on the screen).
And all this same with the examples that I found of school 42 on the internet in that link https://harm-smits.github.io/42docs/libs/minilibx.
All configuration has been done.

  


  Could there be a possible configuration problem ? I'm working on Kali Linux (Even using a VM on Ubuntu it didn't work).

  


  In short my question is what can be the different reasons why the graphical part of minilibx independently of events, loops and etc does not work without errors ?