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• AAC encoder : various fixes in M/S coding

  8 janvier 2016, par Claudio Freire

  AAC encoder : various fixes in M/S coding
  1. Fix sf_idx and band_type addressing to address only the first
  
  subwindow in the group (others could hold garbage values)
  2. Don’t step on ms_mask when is_mask is set. I/S selection
  
  already sets the ms_mask properly and shouldn’t be overridden.
  3. Use mid/sid cb/sf when computing coding error, as should be
  
  since those are the cb/sfs that will eventually be set.
  4. Fix distortion computation on multi-subwindow groups (was
  
  subtracting the bits terms multiple times)
  5. Clear ms_mask when one side uses PNS and the other doesn’t.
  
  When using PNS, ms_mask signals correlated noise, which can be
  
  detected just like regular M/S detection, so we don’t skip
  
  noise bands, but when only one side uses PNS setting the flag
  
  can confuse some encoders, so avoid that.
  

  • [DH] libavcodec/aaccoder.c
  • [DH] libavcodec/mips/aaccoder_mips.c
  • [DH] tests/fate/aac.mak

• diracdec : rewrite HQ slice decoding

  23 juin 2016, par Rostislav Pehlivanov

  diracdec : rewrite HQ slice decoding
  Now coefficients are written to a buffer and are then dequantized by the
  
  new SIMD dequantization functions. For the lower bands without enough
  
  coefficients to fill a register (and hence they overwrite) the C version
  
  of the dequantization function is used.
  The buffer is per-thread and will be realloc’d if anything changes.
  
  This prevents regressions and having to limit slice size.
  Signed-off-by : Rostislav Pehlivanov <rpehlivanov@obe.tv>
  

  • [DH] libavcodec/diracdec.c

• Can I get pictures/stills/photos from inside a container file from a CD-I disc ?

  8 décembre 2017, par user9047197

  I have ffmpeg setup.

  Is there a way to extract pictures/stills/photos (etc) from a container (file) that’s from an old CD-I game that I have.

  I don’t want to extract the audio nor video. And I don’t want frames from the videos either.

  I want the bitmaps (etc) from INSIDE that container file.

  I know my Windows 8.1 PC can’t read inside that container file - so I’m hoping there’s a way to extract all the files (I want) instead using ffmpeg.

  (IsoBuster only gives the audio and video so I know already about IsoBuster.)

  I think there are no individual headers for the pictures/stills/photos, etc.

  Here’s what ExifTool decoded the file as :

  ExifTool Version Number (10.68) 
  
  File Name (green.3t) 
  
  File Size (610 MB) 
  
  File Permissions (rw-rw-rw-) 
  
  File Type (MPEG) 
  
  File Type Extension (mpg) 
  
  MIME Type (video/mpeg) 
  
  MPEG Audio Version (1) 
  
  Audio Layer (2) 
  
  Audio Bitrate (80 kbps) 
  
  Sample Rate (44100) 
  
  Channel Mode (Single Channel) 
  
  Mode Extension (Bands 4-31)
  
  Copyright Flag (False) 
  
  Original Media (False) 
  
  Emphasis (None) 
  
  Image Width (368)
  
  Image Height (272) 
  
  Aspect Ratio (1.0695) 
  
  Frame Rate (25 fps) 
  
  Video Bitrate (1.29 Mbps) 
  
  Duration (1:02:12 approx) 
  
  Image Size (368x272) 
  
  Megapixels (0.100) 

  Thank you for reading and - help !! :D