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• avformat/hlsenc : Check that data is set

  21 janvier 2018, par Brendan McGrath

  avformat/hlsenc : Check that data is set
  If codecpar->extradata is not set (for example, when the stream goes
  
  through the 'tee' muxer), then a segfault occurs.
  
  This patch ensures the data variable is not null before attempting
  
  to access it
  
  Before the var_stream_map option was available - I was using the tee
  
  muxer to create each resolution as an individual stream.
  
  When running this configuration after the most recent hlsenc change
  
  I hit a segfault
  
  The most simple command which recreates the segfault is :
  
  ffmpeg -i in.ts -map 0:a -map 0:v -c:a aac -c:v h264 -f tee [select=\'a,v\':f=hls]tv_hls_hd.m3u8
  Signed-off-by : Brendan McGrath <redmcg@redmandi.dyndns.org>
  

  • [DH] libavformat/hlsenc.c

• Detect duplicate frames to create seamless loops in FFMPEG

  19 septembre 2017, par Yasath Dias

  I feel like this should be possible, after I saw a method created with MoviePy for Python (this article). Essentially, I want to import an MP4 at 1920x1080 with say 12000kbps bitrate and have FFMPEG detect when there are duplicate frames that aren’t consecutive and export each one of these small sequences to small individual MP4 files that loop seamlessly (the first frame is almost the same as the last frame like this one).

  A 1920x1080 file may be far too large (in resolution) to process, so I would be fine with downscaling that to around 120px wide. Also, I know that FFMPEG can detect duplicate frames because I’ve often used mpdecimate previously.

  I hope I described the issue well enough, but will be willing to clarify, of course :)

• FFmpeg : Reading data from 2 FIFO

  21 septembre 2019, par user3497661

  I am working with FFmpeg 4.1.3. I am trying to read video from one named pipe and audio from another named pipe and creating a new output file. There are 2 RTP processes reading data over the network and writing it to these pipes.

  I am using following commandline
  ffmpeg -report -i /tmp/audio_pipe.pcmu -i /tmp/video_pipe.h264 -y output.ts
  When I try to receive from individual pipes,
  (ffmpeg -report -i /tmp/audio_pipe.pcmu -y output.ts), it works but using 2 pipes in the same command line seems to block.
  I found some 7 year old ticket https://trac.ffmpeg.org/ticket/1663. It says that multiple pipes do not work with FFmpeg.

  I would like to know if input using multiple pipes works with FFmpeg now and if yes, how to achieve it.