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• aacenc_tns : tune and reduce artifacts

  6 décembre 2015, par Rostislav Pehlivanov

  aacenc_tns : tune and reduce artifacts
  There are a couple of major changes here :
  1. Start using TNS coefficient compression.
  
  2. Start using 3 bits per coefficient maximum for short windows.
  
  The bits we save from these 2 changes seem to make a nice impact on the
  
  rest of the file/windows.
  3. Remove special case gain checking for short windows.
  
  4. Modify the coefficient loop to support up to 3 windows.
  
  The additional restrictions on TNS were something that was no in the
  
  specifications and furthermore restricting TNS to only low energy short
  
  windows was done to compensate for bugs elsewhere in the code.
  Overall, the improvements here reduce crackling artifacts heard in very
  
  noisy tracks.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aacenc_tns.c

• Reading from an audio CD in Java

  30 novembre 2019, par Macmanmatty

  Hello I’m Finishing up my java music player that is also a portfolio project and I wondered how I can read from an audio CD in java. The java file class can read the file data and send it to ffmpeg via opencv for java and then write to the source data line for playing , unless the user skips songs too fast or tries to seek them. Then the song refuses to play (due to buffer under runs I believe ; it throws ffmpeg frame grabber execeptions) and it just keeps skipping tracks. File input stream was slightly better but it faced other problems and still had seeking problems. My latest idea was to cache the file on to the hard disk and then play it. But not one of the four file copy methods I tried, Java Copy File – Stream, Java Copy File – java.nio.channels.FileChannel, Java Copy File – Apache Commons IO FileUtils, Java Copy File – Files class was able to copy 100% of the file 100% of the time. They mostly transferred about 50-60% of it and then quit. So how does one read from a CD in java ? I’m running OSX 10.12 and all of the audio files appear up as AIFF files . I would like to be able to have this work for all major desktop platforms (OSX Windows, Linux) though.

• avformat/wtvdec : Forward errors when reading packet

  10 février 2020, par Andreas Rheinhardt

  avformat/wtvdec : Forward errors when reading packet
  wtvfile_read_packet did not abide by the requirements of an
  
  AVIOContext's read_packet-function : If it did not read anything,
  
  it returned zero, which currently leads to a warning in read_packet_wrapper
  
  in aviobuf.c. Said warning will be an av_assert2 as soon as
  
  FF_API_OLD_AVIO_EOF_0 is zero (probably the next major version bump).
  
  So instead forward the error code from the underlying protocol.
  This error/assert is triggered in the wtv-demux FATE test.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Reviewed-by : Peter Ross <pross@xvid.org>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/wtvdec.c