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• avcodec/rangecoder : Check e

  25 septembre 2015, par Michael Niedermayer

  avcodec/rangecoder : Check e
  Fixes hang.nut
  Found-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ffv1dec.c
  • [DH] libavcodec/snow.h

• FFmpeg iOS av_read_frame() hangs on cellular connections

  8 novembre 2014, par Moss

  I am able to play an RTMP audio + video stream on iOS. Works fantastic when everything is on a solid WiFi connection.

  When I switch to a cellular connection (great signal strength and LTE/4G), av_read_frame() will intermittently block for an unacceptable amount of time. In some cases, I’ve clocked 30+ seconds of hang time before it moves on and grabs the next frame.

  I attempted a work-around by using the AVIOInterruptCB interrupt callback to abort av_read_frame() if the function takes longer than 1 second to return.

  This definitely aborts av_read_frame() after 1 second, but unfortunately after I do this, future attempts to call av_read_frame() result in EIO errors (-5), which indicates (to me) that the connection has been severed. So I am forced to reconnect with avformat_open_input() ( 3-4 seconds), and then find the stream info again ( 2-3 seconds), and then start reading frames again. This is much better than 10+ seconds of waiting around for the next frame, but it’s much worse than what I wish I could do, which is to just retry immediately and grab the next frame.

  That means, from a cellular user’s perspective, their video locks up intermittently for 5-10 seconds while we reconnect the stream in the background from scratch. Not a great user experience.

  Is there a better way to manage av_read_frame() on a lossy cellular connection ? Or at least improve the reconnect time ? Suggestions ?

• FFmpeg/libavcodec failing for asv1 conversion using PHPVideoToolkit

  24 juillet 2012, par clrockwell

  It seems that I can not get libavcodec running with my install of ffmpeg. I say 'it seems' because the searching I have done based on the following error message has gotten me to that point :

  PHPVideoToolkit Error : Execute error. Output for file "/home/clrock/public_html/drupal-7.14/sites/default/files/img/videos/original/StoryboardMovie.mp4" was found, but the file contained no data. Please check the available codecs compiled with FFmpeg can support this type of conversion. You can check the encode decode availability by inspecting the output array from PHPVideoToolkit::getFFmpegInfo().

  The ffmpeg command is

  /usr/local/bin/ffmpeg \
  
  -i '/home/clrock/public_html/drupal-7.14/sites/default/files/img/videos/original/StoryboardMovie.mp4' \
  
  -strict experimental -vcodec 'asv1' -s '640x480' -acodec 'aac' -ac '2'  \
  
  /tmp/1343067407-500d950fbd290.3gp

  I can not seem to find out how to get ffmpeg to configure with libavcodec. It seems all of the necessary files are there in /usr/src/ffmpeg-0.7.12/libavcodec.

  ffmpeg can make mp4 and flv files fine, only when using asv1 does it hang up.