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• how to synchronize multiple rtsp streams using ffmpeg (or another tool ?)

  23 janvier 2015, par user1913115

  i have several RTP/RTSP live streams that i need to capture to individual mp4 files. this is what i’m doing :

  ffmpeg -i rtsp://source1/video \
  
         -i rtsp://source2/video \
  
         -i rtsp://source3/video \
  
         -map 0 -codec copy out1.mp4 
  
         -map 1 -codec copy out2.mp4 
  
         -map 2 -codec copy out3.mp4 

  which works fine except when packets/frames are dropped, i end up with 3 files of different lengths. e.g. after an hour of capture, i may have this :

  out1.mp4 - 59m58s

  out2.mp4 - 59m30s

  out3.mp4 - 56m41s

  when looking at ffmpeg output i see this periodically :

  [NULL @ 0x7ff8c3843600] RTP: missed 8 packets
  
  [NULL @ 0x7ff8c3843600] RTP: missed 570 packets
  
  [NULL @ 0x7ff8c3843600] SEI type 81 size 672 truncated at 264

  is there a way to synchronize these videos ? i.e. if a packet is dropped on source3 to drop same packets on source1 and source2 ? or repeat last received frame as many times as required on source3 to have videos in sync with each other ?

• 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.

• 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