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• AVI INFO crashes the Octave GUI every time I try to run the code

  18 mai 2017, par Sulphur

  I am trying to run a code in octave which requires reading frame info of a video file. However, it always crashes when I write the aviinfo. The line goes as this :

  > vInfo = aviinfo('C:\devwork\Octave\boosted\resizedVideos\11-50-48--11-50-58_resized.mp4');

  I realized that I did not have FFmpeg installed on my system. I did install it but still it crashes. Any idea why ? How should I solve it ?

  While looking for solutions I came across this discussion which says there is a possibility of an "unfortunate interplay between the Octave code and the ffmpeg code. But I am unable to figure out why ?

• mp4 files / SSTS info

  3 avril 2017, par Thomas

  I am trying to find the fastest way to get a list of all I-frames in a movie.

  So far, I tried ffprobe, but it is quite slow and I have been looking for a faster solution.

  The other option I found is using the mp4parser tool ; it outputs a file with this sectio, the SSTS info :

  -------------------------------------------------------------------------
  
  /moov/trak/mdia/minf/stbl/stss                              @ 0x1c152d8
  
    Box size: 0x44    version: 0x0    flags: 0x0
  
    entry_count:              0xd
  
      sample_number:
  
       0x1    0x12d    0x259    0x385    ....

  I can see that I have 13 I frames and they’re spaced 300 frames apart (from the 4 values displayed)

  Is the spacing of I frames constant through movies ? or do I need to write my own SSTS parser to get the whole list ?

• FFMPEG - error opening key info file

  15 mars 2017, par Hoang Nam

  I want muxer mp4 to m3u8 with key
  I can do this when i put all file in same directory

  • File 480.mp4.key
  • File video 480.mp4
  • File hls info have name :"480.mp4.keyinfo"

  When i run commnand : ffmpeg -i 480.mp4 -hls_time 10 -hls_key_info_file 480.mp4.keyinfo output.mp4.m3u8
  everything run normal.

  but i meet problem when i move file "480.mp4.key" and file "480.mp4.keyinfo" into other directory such as : /usr/local/WowzaStreamingEngine/keys/auto_scan/testhh/2/123/480.mp4.keyinfo
  I also change key directory in file keyinfo

  After that i run

  ffmpeg -i 480.mp4 -hls_time 10 -hls_key_info_file 480.mp4.keyinfo output.mp4.m3u8 ffmpeg -i output/testhh/2/123/480.mp4 -hls_time 10 -hls_key_info_file /usr/local/WowzaStreamingEngine/keys/auto_scan/testhh/2/123/480.mp4.keyinfo output/testhh/2/123/480.mp4.m3u8

  Error :

   error opening key info file /usr/local/WowzaStreamingEngine/keys/auto_scan//testhh/2/123/output/testhh/2/123/480.mp4.keyinfo
  
  Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
  
  Error initializing output stream 0:0 -- 

  Please help me solve problem. Tks !