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    • Justin Ruggles's avatar
      alsa: limit buffer_size to 32768 frames. · e35c674d
      Justin Ruggles authored
      In testing, the file output plugin gave a max buffer size of about 20 million
      frames, which is way more than what is really needed and causes a memory
      allocation error on my system.
      e35c674d
  10. 02 Jul, 2011 1 commit
    • Nicolas George's avatar
      ALSA demuxer: use av_gettime and a timefilter. · 5d35b279
      Nicolas George authored
      The PTS for captured audio was measured using snd_pcm_htimestamp.
      
      snd_pcm_htimestamp hangs when the input is a dsnoop plugin.
      
      Furthermore, at some point, snd_pcm_htimestamp started returning monotonic
      timestamps rather than wall clock timestamps, in most but not all
      situations.
      Monotonic timestamps are fine, but ffmpeg uses wall clock timestamps
      everywhere else, and we have no API to inform the user which kind of
      timestamps it is.
      
      A separate snd_pcm_htimestamp is only slightly less accurate than
      snd_pcm_htimestamp: the standard deviation for the difference between two
      consecutive timestamps is (on my hardware):
      - ~13 µs with snd_pcm_htimestamp;
      - ~35 µs with av_gettime;
      -  ~5 µs with av_gettime and a timefilter.
      5d35b279
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