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• avcodec/pgssubdec : Check for duplicate display segments

  29 janvier 2019, par Michael Niedermayer

  avcodec/pgssubdec : Check for duplicate display segments
  In such a duplication the previous gets overwritten and leaks
  Fixes : memleak
  
  Fixes : 12510/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGSSUB_fuzzer-5694439226343424
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/pgssubdec.c

• How to display quick preview of output generated from FFMPEG command ? [android]

  6 février 2019, par akash varlani

  Basically I am developing a video editing app that lets user choose some of their images and create video slide show with music.

  I am using FFMPEG to generate video slide show from images but the problem is I can only show preview of the video after executing FFMPEG command.

  Is googled so many blogs and all and I know there is a possible way available to display preview of the output.

  Check below image from reference app. I am developing something similar to this app. There is an option to replace the image in video. This app displays instant preview once I change the image.

  

  Here is the link of the reference app if anyone wants to check :
  https://play.google.com/store/apps/details?id=com.newbiz.mvmaster

  Clicking an EXPORT button this app lets you generate video output. I can do that as I know FFMPEG and how to generate OUTPUT FILE using FFMPEG but what I don’t know is how to display quick preview of OUTPUT VIDEO before generating actual VIDEO FILE.

  On my UBUNTU device I can view output of FFMPEG command using FFPLAY tool but how to do the same on android device.

  Some useful link :
  http://androidwarzone.blogspot.com/2011/12/ffmpeg4android.html

• How to display decoded YUV420P format frames into Qt in an efficient way but without OpenGL ?

  15 février 2019, par Lucas Zanella

  I’ve been trying to render video decoded from ffmpeg ito Qt in several ways. I tried using QAbstractVideoBuffer here : How to map a decoded buffer from ffmpeg into QVideoFrame ? but ALL code examples I find construct a QImage and paint it on the screen, which I think it’s very inneficient.

  I’ve found here : https://stackoverflow.com/a/12925009/10116440 that OpenGL can also be used in Qt, but I think it is a bit of an overkill because OpenGL is for rendering intense graphics.

  I’m sure there must be a way but I couldn’t find anywhere.

  So : how to display decoded YUV420P format frames into Qt in an efficient way but without OpenGL ?

  I just need a guide, as https://doc.qt.io/qt-5/videooverview.html#working-with-low-level-video-frames won’t help me at all !