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• avcodec/mpeg_er : Simplify disabling IDCT

  13 juin 2024, par Andreas Rheinhardt

  avcodec/mpeg_er : Simplify disabling IDCT
  The error resilience code does not make up block coefficients
  
  and therefore zeroes them in order to disable the IDCT.
  
  But this can be done in a simpler manner, namely by setting
  
  block_last_index to a negative value. Doing so also has
  
  the advantage that the dct_unquantize functions are never even
  
  called for those codecs that do not use ff_mpv_reconstruct_mb()
  
  for ordinary decoding (namely RV-30/40 and the VC-1 family).
  This approach would not work for intra macroblocks (there is always
  
  at least one coefficient for them and therefore there is no check
  
  for block_last_index for them), but this does not happen at all.
  
  Add an assert for this.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg_er.c

• svq1dec : Unbreak the scratch buffer allocation

  6 décembre 2014, par Michael Niedermayer

  svq1dec : Unbreak the scratch buffer allocation
  The input packets are always assumed to be padded and
  
  the av_fast_ family of function takes a pointer to a pointer.
  Thanks to Nicolas Dufresne <nicolas.dufresne@collabora.com> for
  
  a similar patch.
  Introduced in 7b588bb691644e1b3c168b99accf74248a24e3cf.
  Bug-Id : 766
  
  CC : libav-stable@libav.org
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavcodec/svq1dec.c

• How to batch convert to x265 minimal file size but keep best possible quality using hardware acceleration in Windows ?

  12 août 2023, par N.TW12

  I am new to the ffmpeg, as the matter of fact just know it for a few hours, I have a huge family videos in mp4/mov x264 format and I would like to convert them all to x265. I don't know what setting is robust for most of the cases so I use -c:v hevc_nvenc and tried :

  


  for /f "tokens=1 delims=." %a in ('dir /B *.mp4') do ffmpeg -i -c:v hevc_nvenc "%a.mp4" "%a.x265.mp4"

for /f "tokens=1 delims=." %a in ('dir /B *.mp4') do ffmpeg -i  "%a.mp4" -c:v hevc_nvenc "%a.x265.mp4" 


  


  I got an error : v was unexpected at this time. How to batch convert to x265 minimal file size but keep best possible quality using hardware acceleration in Windows ?

  


  Edit : I also would like to change the filename by adding ".x265" @ the end of the new file.