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• How to create/repair the XingHeader for total stream size using taglib or other tools ?

  6 novembre 2012, par user784637

  I downloaded a video from youtube whose audio was encoded in aac and then I transcoded it to an mp3 using the libmp3lame codec.

  $ ffmpeg -i video.mp4 -vn -acodec libmp3lame -ab 128K -- cold.mp3

  Now when I try to write id3 tags to it using the taglib example tagwriter I get the following warning :

  $ ./testwriter -t 'stuff' cold.mp3
  
  TagLib: MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.

  The id3 tags are written and display correctly, but the lack of well formed XingHeaders causes older mp3 players to loop the song several times or even crash (I don't know why, this song has been encoded as cbr not vbr.) In windows 7 the Bit rate displays as 0kbps.
  

  How do I create a wellformed XingHeader for total stream size using taglib or other tools that can be executed from the commandline ?

  Here's some documentation for xingheaders on taglib

  http://taglib.github.com/api/classTagLib_1_1MPEG_1_1XingHeader.html#ac0ba25f2922757c4bdd2851fdc2ccdde

  http://taglib.github.com/api/xingheader_8h_source.html

• rpza : limit the number of blocks to the total remaining blocks in the frame

  28 novembre 2013, par Anton Khirnov

  rpza : limit the number of blocks to the total remaining blocks in the frame
  Fixes invalid writes.
  Found-by : Mateusz "j00ru" Jurczyk and Gynvael Coldwind
  
  CC:libav-stable@libav.org
  

  • [DH] libavcodec/rpza.c

• Revision ec2dbdd107 : Improve vp9_fdct4x4_sse2 (x1.2) Modifications are done to reduce the total cloc

  21 novembre 2013, par Abo Talib Mahfoodh

  Changed Paths :
   Modify /vp9/encoder/x86/vp9_dct_sse2.c

  
  
  Improve vp9_fdct4x4_sse2 (x1.2)

  Modifications are done to reduce the total clock cycle.
  Speedup : 1.2

  Tested with : park_joy_420_720p50.y4m

  Change-Id : Ia36b87e62e2f80a5fadaf5628729aedc80f38f3f