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• vc2enc : do not allocate packet until exact frame size is known

  2 mars 2016, par Rostislav Pehlivanov

  vc2enc : do not allocate packet until exact frame size is known
  This commit solves most of the crashes and issues with the encoder and
  
  the bitrate setting. Now the encoder will always allocate the absolute
  
  lowest amount of memory regardless of what the bitrate has been set to.
  
  Therefore if a user inputs a very low bitrate the encoder will use the
  
  maximum possible quantization (basically zero out all coefficients),
  
  allocate a packet and encode it. There is no coupling between the
  
  bitrate and the allocation size and so no crashes because the buffer
  
  isn’t large enough.
  The maximum quantizer was raised to the size of the table now to both
  
  keep the overshoot at ridiculous bitrates low and to improve quality
  
  with higher bit depths (since the coefficients grow larger per transform
  
  quantizing them to the same relative level requires larger quantization
  
  indices).
  Since the quantization index start follows the previous quantization
  
  index for that slice, the quantization step was reduced to a static 1
  
  to improve performance. Previously with quant/5 the step was usually
  
  set to 0 upon start (and was later clipped to 1), that isn’t a big change.
  
  As the step size increases so does the amount of bits leftover and so
  
  the redistribution algorithm has to iterate more and thus waste more
  
  time.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/vc2enc.c

• Convert video with FFMPEG Library in android

  27 septembre 2012, par Sanat Pandey

  I have a problem that I received a video foile from the server which can not be played throgh video view from the app I am making. I don't know what the actaul problem is because all videos are played through same video view but the video received from the server side is not played. So, I think that I have to integrate FFMPEG in our android app, so I can play every video at a runtime conversion. For this I have read much more about FFMPEG Library integration with android through many sites as :

  http://www.roman10.net/how-to-build-android-applications-based-on-ffmpeg-by-an-example/

  Downloaded some projects from GitHUb (https://github.com/appunite/AndroidFFmpeg) but unable to succeed for building the Library through NDK. Some thing I missed and I am working on Windows machine, probably this might be a problem. I want the exact solution regarding this, means step by step solution for building the android project with FFMPEG Library. If you have some useful suggestion then please share with me.

  Thanks in advance.

• FFmpeg 1.0 causing audio playback issues

  7 novembre 2013, par Jona

  I have an audio streamer based on ffplay. It works great using ffmpeg 0.11 but when I use ffmpeg 1.0 or the latest 1.2 release the audio seems to be decoded or played weirdly.

  Essentially it sounds like chipmunks with mp3 streams and with aac streams I hear tons of static barely hearing the actual stream and the actual stream sounds slow.

  Any ideas the possible changes in ffmpeg that could have caused these types of issues ?

  Similar issue was posted here but no actual answer about what is going on. Supposedly this code reproduces the same issue.

  UPDATE 1 :
  I have done a step by step copy from ffplay and still no luck ! :/ The channel and sampling rate look correct so there must be something internally that is returning a weird decoded format ?