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• build : Fine-grained link-time dependency settings

  22 janvier 2017, par Diego Biurrun

  build : Fine-grained link-time dependency settings
  Previously, all link-time dependencies were added for all libraries,
  
  resulting in bogus link-time dependencies since not all dependencies
  
  are shared across libraries. Also, in some cases like libavutil, not
  
  all dependencies were taken into account, resulting in some cases of
  
  underlinking.
  To address all this mess a machinery is added for tracking which
  
  dependency belongs to which library component and then leveraged
  
  to determine correct dependencies for all individual libraries.
  

  • [DBH] Makefile
  • [DBH] avbuild/common.mak
  • [DBH] avbuild/library.mak
  • [DBH] configure
  • [DBH] tests/checkasm/Makefile

• Read frames from a h264 video in java

  19 octobre 2014, par Shashank Tulsyan

  I am making a tool which records the user’s screen.
  It records almost every activity of the user and saves it as a h264 video.

  I also make a note of the window names.
  Then I make charts out of this data, which tells me how much time the user (me) has spend on what activity. Now I want to take this one level further.
  I want to be able to see the filtered video as well.

  Let’s say, I know I have spend 4 hrs on Netbeans, I also want to see a video showing what all I did on netbeans.

  Some sample video files

  http://neembuu.com/testdir/sat_1413633155981_direct.mkv
  http://neembuu.com/testdir/fri_1413547843213_direct.264

  I am using x264 for encoding.

  These files might be corrupt. Because encoding stops when the user shutsdown the pc or close the program. There is no handling of abrupt program exit. EOF is not written properly. This is a design decision.

  Now the problem is, none of the libraries ( jcodec , h264j ) seem to be able to decode these files.
  I want individual frames.

  Problem with h264j

  • Doesn’t support seeking
  • Randomly doesn’t work for some files, although all files have been created using the same settings ( like the sample fri_1413547843213_direct.264 , h264j doesn’t work with it. )

  Problem with jcodec.

  • Can’t handle mkv
  • Not sure how to use with raw h264 streams (<<< help would be appreciated here, so far I couldn’t find a way to handle raw h264 streams in jcodec )
  • If I used the jcodec’s MP4 muxer ( org.jcodec.samples.mux.AVCMP4Mux ) it does generate a mp4 but it is not able to read the same mp4 which it only generated
  • JCodec handles externally generated mp4 files pretty well. Can seek to any random frame and renders the frame BufferedImage beautifully, but it seems I don’t have my videos in a format which jcodec can handle.

  The encoding settings which I am using.

  x264 - --keyint 240 --sar 1:1 --output "destinationFile" --stitchable --fps 1/1 --input-res 1280x800 --input-csp rgb

  Any tip/advice. How can I make this work ?
  Thanks :D

  Ref : This question is in continuation of this How to make video from images using Java + x264 ; cross platform solution required

• libavformat/matroska : Write stream durations in metadata, in the format of mkvmerge.

  5 août 2015, par Sasi Inguva

  libavformat/matroska : Write stream durations in metadata, in the format of mkvmerge.
  Compute individual stream durations in matroska muxer.
  
  Write them as string tags in the same format as mkvmerge tool does.
  Signed-off-by : Sasi Inguva <isasi@google.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/fate/wavpack.mak
  • [DH] tests/ref/acodec/tta
  • [DH] tests/ref/fate/binsub-mksenc
  • [DH] tests/ref/lavf/mkv
  • [DH] tests/ref/seek/lavf-mkv