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• ffmpeg : remove misleading and incorrect warning messages

  15 juin 2017, par wm4

  ffmpeg : remove misleading and incorrect warning messages
  It is wrong/incorrect in two aspects :
  
  1. The pixel format is not enough to guarantee that the resulting file
  
     will be any more compatible with media players.
  
  2. Media players not supporting higher profiles are not necessarily
  
     outdated (in fact this is simply an arrogant statement that
  
     libavcodec can handle these particular features).
  You could add that there are plenty of other ways to produce widely
  
  incompatible files with ffmpeg, and these don't show any warnings.
  What we really want to do here is defaulting to codec profiles that
  
  have wide compatibility, such as main/high for h264. Also, if an
  
  encoder does not accept certain pixfmts, we should automatically
  
  convert them to a pixfmt the encoder can accept. But the existing
  
  message certainly is not appropriate.
  It also works for 2 specific encoders only. Extending it for other
  
  cases would result in a lot of special cases, so this is not the
  
  right place.
  

  • [DH] ffmpeg.c

• use content of ffmpeg -i when cutting

  21 juillet 2015, par Babb

  I want to make a script (bash or bat) that cuts out parts of a .mp4 file based on the ffmpeg -i output.

  When i run ffmpeg -i this is part of the output :

   Duration: 00:25:49.93, start: 0.000000, bitrate: 2624 kb/s
  
  Chapter #0.0: start 0.000000, end 6.524000
  
  Metadata:
  
    title           : Video
  
  Chapter #0.1: start 6.524000, end 39.143000
  
  Metadata:
  
    title           : Advertisement
  
  Chapter #0.2: start 39.143000, end 453.007000
  
  Metadata:
  
    title           : Video
  
  Chapter #0.3: start 453.007000, end 499.780000
  
  Metadata:
  
    title           : Advertisement
  
  Chapter #0.4: start 499.780000, end 791.707000
  
  Metadata:
  
    title           : Video
  
  Chapter #0.5: start 791.707000, end 822.983000
  
  Metadata:
  
    title           : Advertisement
  
  Chapter #0.6: start 822.983000, end 1213.436000
  
  Metadata:
  
    title           : Video
  
  Chapter #0.7: start 1213.436000, end 1262.162000
  
  Metadata:
  
    title           : Advertisement
  
  Chapter #0.8: start 1262.162000, end 1549.933000
  
  Metadata:
  
    title           : Video

  I only want the "Video" chapters, so the output would be :
  Video1.mp4
  Video2.mp4
  Video3.mp4
  Video4.mp4
  Video5.mp4

  Then I can use

  ffmpeg -f concat -i files.txt -map 0 -c copy output.mp4

  to joint them back together.

• Convert video from image and audio files using FFMPEG

  22 janvier 2016, par Rama Lingam

  Here i am converted video from images(8) and audio(file size : 307KB).
  But the video is playing one image with audio and others are without audio.
  In my knoledge : Because the audio file size is very low.
  I want to converted video playing all images with audio.
  Sample code :

  $audioPath = 'upload/2016/01/tmp_81332/audio_1453307709.wav';
  
  $convAudioPath = 'upload/2016/01/tmp_81332/output.mp3';
  
  $ffmpeg = '/usr/bin/ffmpeg';
  
  
  
  $convImgPath = 'upload/2016/01/tmp_81332/image%d.jpeg';
  
  $output = 'upload/2016/01/video_81332_1453307709.mp4';
  
  
  
  exec("$ffmpeg -i $audioPath -f mp2 $convAudioPath");
  
  exec("$ffmpeg -framerate 1/5 -i $convImgPath -i $convAudioPath -c:v libx264 -c:a aac -strict experimental -b:a 16k -shortest $output");

  However this extends the output video file to be the length of the audio file if it is longer than the video. Using -shortest cuts the video file short if the audio file is shorter than the video. So is there a flag to tell ffmpeg to cut the keep the length of the output video to the length of the input video ?