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• avconv transcoding drops frames

  7 mars 2015, par ziggestardust

  I have a logitech c920 that I can send perfectly fine to a wowza server with this with excelent results :

  ./capture  -o -c0|avconv -f alsa  -b 128k -i hw:1   -re -i - -vcodec copy  -ar 44100 -bufsize 1835k   -map 0:0 -map 1:0 -f flv rtmp://myhost/live/streamname

  (capture program is from here : http://derekmolloy.ie/streaming-video-using-rtp-on-the-beaglebone-black/ I’m not using beaglebone, but his capture software runs excellent on my debian pc)

  However, I want to store the h264 stream from the camera down to disk, and later send it in a lower resolution with avconv so I’m playing with libx264

  It seems I can’t even do this without getting drops :

  ./capture  -o -c0|avconv -f alsa  -b 128k -i hw:1   -re -i - -vcodec libx264  -ar 44100 -bufsize 1835k   -map 0:0 -map 1:0 -f flv rtmp://myhost/live/streamname

  This is what avconv ’-v verbose’ shows :

  alsa @ 0x864b940] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, alsa, from 'hw:1':
  
    Duration: N/A, start: 22758.998967, bitrate: N/A
  
      Stream #0.0: Audio: pcm_s16le, 32000 Hz, 2 channels, s16, 1024 kb/s
  
  .................................................................................................................................[h264 @ 0x8659400] max_analyze_duration reached
  
  [h264 @ 0x8659400] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, h264, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1.0: Video: h264 (Constrained Baseline), yuvj420p, 1280x720 [PAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 48 tbc
  
  Parsing...
  
  Parsed protocol: 0

  ...... and then this :

  Output #0, flv, to 'rtmp://mystream/live/streamname':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0: Audio: libmp3lame, 44100 Hz, 2 channels, s16, 200 kb/s
  
      Stream #0.1: Video: libx264, yuvj420p, 1280x720 [PAR 1:1 DAR 16:9], q=-1--1, 1k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le -> libmp3lame)
  
    Stream #1:0 -> #0:1 (h264 -> libx264)
  
  Press ctrl-c to stop encoding
  
  [alsa @ 0x864b940] ALSA buffer xrun.
  
  *** drop!
  
      Last message repeated 39 times
  
  *** drop!11 fps=  0 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=40    
  
      Last message repeated 46 times
  
  *** drop!22 fps= 21 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=87    
  
  .    Last message repeated 20 timesss
  
  .....*** drop!   27 fps= 13 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=108    
  
      Last message repeated 3 timess
  
  ..*** drop! fps= 10 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=112    
  
      Last message repeated 5 timesss
  
  .*** drop!0 fps=  9 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=118    
  
  .    Last message repeated 5 timess
  
  .*** drop!2 fps=  9 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=124    
  
      Last message repeated 6 timesss
  
  .*** drop!3 fps=  8 q=0.0 size=       0kB time=0.03 bitrate= 116.9kbits/s dup=0 drop=131    
  
  ^C    Last message repeated 1 times
  
  *** drop!
  
      Last message repeated 3 times

  Any help appreciated

• Can someone teach me about downloading DRM content ? [closed]

  1er octobre 2024, par KingKongGotNoBalls

  There is some videos that I would like to download that are DRM protected. I tried using StreamFab for the first time yesterday and it told me that the encryption used in the video was unknown or something like that.

  


  I have read that you have to get some keys and then unencrypt something. But I have tried researching it many times and I have never found someone throughly explain all the process. Most of the videos that I need are on the -N-B-A- site.

  


  Could someone explain to me the process of how to do that ?

  


• lavc/flacenc : partially unroll loop in flac_enc_lpc_16

  12 août 2014, par James Darnley

  lavc/flacenc : partially unroll loop in flac_enc_lpc_16
  It now does 12 samples per iteration, up from 4.
  From 1.8 to 3.2 times faster again.  3.6 to 5.7 times faster overall.
  
  Runtime is reduced by a further 2 to 18%.  Overall runtime reduced by
  
  4 to 50%.
  Same conditions as before apply.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/flacenc.c
  • [DH] libavcodec/x86/flac_dsp_gpl.asm