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• How to convert mp4 to h264 adding AUDs using FFMPEG

  30 décembre 2016, par SyntheticGio

  I am trying to convert an mp4 clip to h264 bytestream format using FFMPEG. I have successfully compiled FFMPEG from source with access to libx264.

  Looking at the documentation for FFMPEG (version 3.2.2) under libx264 there is a bool flag -aud. In the online documentation it gives the example

  ffmpeg -i input.flac -id3v2_version 3 out.mp3

  Using this format, the following command works, but doesn’t produce the desired AUDs in the output file :

  ffmpeg -i input.mp4 -codec:v libx264 -aud 1 output.h264

  I’ve also tried different variants with this including :

  ffmpeg -i input.mp4 -vcodec libx264 -aud 1 output.h264
  
  ffmpeg -i input.mp4 -aud 1 output.h264

  etc.

  I assume there is something I’m misunderstanding about performing this operation. I basically want to take a h264 movie in an mp4 container and dump it as an h264 stream with AUDs added to it. Any idea why this isn’t working ?

  (I’ve also tried using x264 with the -aud flag, also ran fine but didn’t produce the desired output).

• matroskadec : partly revert "demux relevant subtitle packets after a seek"

  26 novembre 2016, par Rainer Hochecker

  matroskadec : partly revert "demux relevant subtitle packets after a seek"
  This reverts parts of c16582579b1c6f66a86615c5808cd5b2bf17be73. The hard
  
  coded 30 seconds are a lot, and finishing the seek can takes several
  
  seconds when the source is on a network share. Remove this code
  
  entirely, because it does more bad than good.
  (Commit message provided by committer, based on the original messages
  
  by the patch author.)
  Signed-off-by : Rainer Hochecker <fernetmenta@online.de>
  
  Signed-off-by : wm4 <nfxjfg@googlemail.com>
  

  • [DH] libavformat/matroskadec.c

• FFMPEG - How to Extract Frames As Images While Removing Sequentially Duplicate Frames

  19 octobre 2018, par Michael Nelson

  Is there any way (via script or preferably some parameter in calling ffmpeg that I missed) to extract frames from an avi file and ignore sequentially duplicate frames, thus being able to go through the pictures looking only at the deltas/changes ?

  I frequently have to record meetings at work and a lot of the time, the client screen that I am looking at is not changing while we are talking over the phone. After the meeting is over, I need to use these images as part of our documentation and specifications gathering.

  I know that I could just output every frame and run them through any given duplicate file remover utility, but this would remove ALL duplicate frames. So, if the frames extracted went like this :

  A, A, A, B, B, B, B, C, C, A, A, C, C, C, B, B, B ...

  Running them through a typical duplicate file remover, I would get : A, B, C

  What I would want is : A, B, C, A, C, B

  The command that I am currently using to extract the images is :

  ffmpeg.exe -i file.avi -ss 0 -sameq -f image2 -r 1 images%5d.png

  I was getting every frame beforehand (removing the -r 1 from above), but that was generating way too many frames to deal with since these online meetings can go for hours, so for now, I get one frame per second from the file.

  A Windows based solution would be preferable, however, I’m sure other people would be interested in solutions on other platforms if available.

  Any solution or point in the right direction is much appreciated.