Recherche avancée

Sur d’autres sites (8418)

• dnxhddec : Decode and use interlace mb flag

  26 septembre 2015, par Christophe Gisquet

  dnxhddec : Decode and use interlace mb flag
  This bit is 1 in some samples, and seems to coincide with interlaced
  
  mbs and CID1260. 2008 specs do not know about it, and maintain qscale
  
  is 11 bits. This looks oversized, but may help larger bitdepths.
  Currently, it leads to an obviously incorrect qscale value, meaning
  
  its syntax is shifted by 1. However, reading 11 bits also leads to
  
  obviously incorrect decoding : qscale seems to be 10 bits.
  However, as most profiles still have 11bits qscale, the feature is
  
  restricted to the CID1260 profile (this flag is dependent on
  
  a higher-level flag located in the header).
  The encoder writes 12 bits of syntax, last and first bits always 0,
  
  which is now somewhat inconsistent with the decoder, but ends up with
  
  the same effect (progressive + reserved bit).
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/dnxhddec.c

• av1/h264_metadata : Don't reinitialize data

  20 juin 2019, par Andreas Rheinhardt

  av1/h264_metadata : Don't reinitialize data
  If the relevant elements (the color description elements for AV1 and the
  
  VUI elements in general for H.264 (since 1156b507)) are absent, then their
  
  correct values (usually meaning unknown) have already been inferred by
  
  the reading process, so that it is unnecessary to initialize them again
  
  in the av1/h264_metadata filters even when they were initially absent.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/av1_metadata_bsf.c
  • [DH] libavcodec/h264_metadata_bsf.c

• compile the ffmpeg3.3 for Mac OS show ERROR : libmp3lame >= 3.98.3 not found

  4 mars 2018, par MR.PJ

  I use my mac to compile the ffmpeg3.3 for Mac OS according to https://trac.ffmpeg.org/wiki/CompilationGuide/macOS.I tried the first(which through Homebrew) and third(which builds it yourself) method,the first method is ok.

  But the third, compiling FFmpeg myself and Installing dependencies with Homebrew.I don’t know the meaning of this sentence enter image description here

  after this step :

  ./configure  --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass \
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame \
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libopus --enable-libxvid \
--samples=fate-suite/

  terminal show :

  RROR: libmp3lame >= 3.98.3 not found

  when I use locate libmp3lame.a,it is at ’/usr/local/Cellar/lame/3.99.5/lib/libmp3lame.a’.

  I also try --enable-libmp3lame --extra-ldflags=-L/usr/local/lib to solve,but it is no effect.

  How to solve thisERROR: libmp3lame >= 3.98.3 not found