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• ffmpeg : videos before and after conversion aren't the same length

  16 juillet 2012, par Koyot

  I have a set of .mov videos which require conversion to .mp4 format. I'm using ffmpeg and running this command :

  ffmpeg -i Banking.mov -vsync -async -sameq -ac 1 -ab 64k -ar 44100 Banking.mp4

  There is a slight difference between input and output video in time length (00:03:35.407 and 00:03:35.582). And here's the catch - I'm storing time cue set at precise times in a file which is used by a program to point at specific scenes. The 0.1 second difference causes it to point at wrong scenes, therefore making the cue set useless. Is there any possibility to preserve exactly the same time in different format ?

     FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice BellardMac OSX universal build for ffmpegX
  
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
  
    libavutil version: 49.0.0
  
    libavcodec version: 51.9.0
  
    libavformat version: 50.4.0
  
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5597b8]negative ctts, ignoring
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Banking.mov':
  
    Duration: 00:03:35.6, start: 0.000000, bitrate: 1400 kb/s
  
    Stream #0.0(eng): Audio: pcm_s16be, 24000 Hz, stereo, 768 kb/s
  
    Stream #0.1(eng), 29.97 fps(r): Video: h264, yuv420p, 720x480
  
  Output #0, mp4, to 'Banking.mp4':
  
    Stream #0.0, 29.97 fps(c): Video: mpeg4, yuv420p, 720x480, q=2-31, 200 kb/s
  
    Stream #0.1: Audio: aac, 44100 Hz, mono, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press [q] to stop encoding
  
  frame= 6461 q=0.0 Lsize=   53181kB time=215.3 bitrate=2023.3kbits/s    
  
  video:51437kB audio:1618kB global headers:0kB muxing overhead 0.237816%

• How to check whether two image are similar in Android

  14 mars 2014, par Williams

  I am working on the app where suppose I capture the picture of the tool like hammer or anything and later I again capture it then here I need to compare whether the tool is same so it is similar like to whether both picture are similar.

  I have got one idea to do this to check the RGB pixels value of the both captured image and take the average then compare them. If both are probably near then it means both are same but that would take much time.

  Any other better solution to do this in Android ?

• Revision 2e05341ab4 : Fix bad speed settings interaction. The flag x->skip_recode interacts badly wit

  20 mars 2014, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
  
  Fix bad speed settings interaction.

  The flag x->skip_recode interacts badly with
  the cpi->sf.use_nonrd_pick_mode and
  cpi->sf.skip_encode_sb speed settings.

  Restricting the use of the skip_decode flag when
  these other speed choices are in use helps quality
  for speeds 3 and 4 by a large amount with only a
  small impact on speed.

  Average improvmentes for 2 pass speed 4 :
  Derf +8.8%
  Yt + 10.53%
  Std-Hd +6.95%
  yt-hd + 22.95%

  Change-Id : I8010876d8012042a11077c92e69d813c3dfa58eb