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• Revision 4b57a8b356 : Add extended transforms for 32x32 and 64x64 Framework for alternate transforms

  17 juillet 2015, par Debargha Mukherjee

  Changed Paths :
   Modify /test/quantize_test.cc

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_entropy.h

  
   Modify /vp9/common/vp9_entropymode.c

  
   Modify /vp9/common/vp9_entropymode.h

  
   Modify /vp9/common/vp9_enums.h

  
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/common/vp9_idct.h

  
   Modify /vp9/common/vp9_idwt.c

  
   Modify /vp9/common/vp9_idwt.h

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/common/vp9_scan.c

  
   Modify /vp9/common/vp9_scan.h

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_dwt.c

  
   Modify /vp9/encoder/vp9_dwt.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encoder.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/vp9_rd.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Add extended transforms for 32x32 and 64x64

  Framework for alternate transforms for inter 32x32 and larger based
  on dwt-dct hybrid is implemented.
  Further experiments are to be condcuted with different
  variations of hybrid dct/dwt or plain dwt, as well as super-resolution
  mode.

  Change-Id : I9a2bf49ba317e7668002cf1499211d7da6fa14ad

• aacenc_tns : rework coefficient quantization and filter application

  1er septembre 2015, par Rostislav Pehlivanov

  aacenc_tns : rework coefficient quantization and filter application
  This commit reworks the TNS implementation to a hybrid between what
  
  the specifications say, what the decoder does and what’s the best
  
  thing to do.
  The filter application function was copied from the decoder and
  
  modified such that it applies the inverse AR filter to the
  
  coefficients. The LPC coefficients themselves are fed into the
  
  same quantization expression that the specifications say should
  
  be used however further processing is not done, instead they’re
  
  converted to the form that the decoder expects them to be in
  
  and are sent off to the compute_lpc_coeffs function exactly the
  
  way the decoder does. This function does all conversions and will
  
  return the exact coefficients that the decoder will generate, which
  
  are then applied to the coefficients.
  
  Having the exact same coefficients on both the encoder and decoder
  
  is a must since otherwise the entire sfb’s over which the filter
  
  is applied will be attenuated.
  Despite this major rework, TNS might not work fine on some audio
  
  types at very low bitrates (e.g. sub 90kbps) as it can attenuate
  
  some coefficients too much. Users are advised to experiment with
  
  TNS at higher bitrates if they wish to use this tool or simply
  
  wait for the implementation to be improved.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc.h
  • [DH] libavcodec/aacenc_tns.c
  • [DH] libavcodec/aacenc_tns.h

• drawertext color with conditon ffmpeg

  31 octobre 2022, par abderrahim khadri

  I have a coin price banner where I use ffmpeg to stream it and use reload:1 to render it in real time. I want to color the negative with red and the positive with green , haw to do it and is it posible with fflmpeg

  


  -vf 'drawtext=enable='between(t,18.93,20.28)':fontfile=fonts/cousine-bold.ttf:fontsize=144:fontcolor_expr=%{eif\\: if(between(0,1000)\, green\, red) \\: x}:x=82:y=288:text=coinsprice.txt:reload:1'