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• How to merge a segmented webvtt subtitle file and output a single srt file ?

  24 janvier 2019, par Dobbelina

  How to merge a segmented webvtt subtitle file and output a single srt file ?,
  m3u8 looks like this example :

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-MEDIA-SEQUENCE:1
  
  #EXT-X-INDEPENDENT-SEGMENTS
  
  #EXT-X-TARGETDURATION:4
  
  #USP-X-TIMESTAMP-MAP:MPEGTS=900000,LOCAL=1970-01-01T00:00:00Z
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-1.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-2.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-3.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-4.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-5.webvtt
  
  #EXTINF:4, no desc
  
  0ghzi1b2cz5(11792107_ISMUSP)-textstream_swe=2000-6.webvtt
  
  #EXT-X-ENDLIST

  I noticed that each segment is not synchronized/cued against total playing time, but against the individual ts segments.
  If ffmpeg could be used to do this, what magic input do i need to give it ?

  A single correctly cued vtt file would work to.
  Thanks for any replies you lovely people !

• avfilter/vf_unsharp : Don't dereference NULL

  1er décembre 2019, par Andreas Rheinhardt

  avfilter/vf_unsharp : Don't dereference NULL
  The unsharp filter uses an array of arrays of uint32_t, each of which is
  
  separately allocated. These arrays also need to freed separately ; but
  
  before doing so, one needs to check whether the array of arrays has
  
  actually been allocated, otherwise one would dereference a NULL pointer.
  
  This fixes #8408.
  Furthermore, the array of arrays needs to be zero-initialized so that
  
  no uninitialized pointer will be freed in case an allocation of one of
  
  the individual arrays fails.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_unsharp.c

• RuntimeException on FFmpegMediaMetaDataRetriever setDataSource (status = 0xFFFFFFFF)

  27 septembre 2017, par LaVieEnRoux

  I am attempting to load a .mp4 video from assets. I am getting the following error at the top of the stack trace if I access either via URI or FileDescriptor :

  java.lang.RuntimeException : setDataSource failed : status = 0xFFFFFFFF
  at wseemann.media.FFmpegMediaMetadataRetriever.setDataSource(Native
  Method)

  A little snippet of code that causes the exception :

  mmr = new FFmpegMediaMetadataRetriever();
  
  AssetManager assets = getAssets();
  
  AssetFileDescriptor afd = assets.openFd(TEST_VIDEO);
  
  mmr.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());

  I’m using version 1.0.14 in Android Studio. I’ve tried using either the pre-built AAR or the compile ’com.github.wseemann:FFmpegMediaMetadataRetriever:1.0.14’ link in the build.gradle dependences, and both give the same result.

  The curious thing is that this loads perfectly fine when I use MediaMetadataRetriever on the same video in place of FFmpegMediaMetadataRetriever. One of the videos with which the error was happening is available at the following link : https://drive.google.com/open?id=0B_r_uzvCTCgsS2xVMUk4TW13YUE

  Anyone have suggestions ? I’d be using MediaMetadataRetriever instead but I need to be able to grab every individual frame of the video and it doesn’t appear to be capable.