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• dnxhddec : better support for 4:4:4

  4 octobre 2015, par Christophe Gisquet

  dnxhddec : better support for 4:4:4
  Profiles 1256 & 1270 (currently) signal at the frame header and MB
  
  levels the colorspace used, either RGB or YUV. While a MB-level
  
  varying colorspace is not supported, whether it is constant can be
  
  tracked so as to determine the exact colorspace.
  This requires having bitdepth and the ACT and 4:4:4 flags, in turn
  
  needing the CID. Because setting those before having validated
  
  enough things may result in invalid/unset DSP fucntions, setting
  
  the bitdepth in the context is delayed.
  It is not tested against a true RGB sequence, though.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/dnxhddec.c

• FFprobe, how to get frame rate of animated gif as a decimal in JSON format

  7 juin 2020, par codingatty

  When I used ffprobe against an animated gif, I get, among other things, this :

  



  > ffprobe.exe  foo.gif
. . . 
Stream #0:0: Video: gif, bgra, 500x372, 6.67 fps, 6.67 tbr, 100 tbn, 100 tbc


  



  Great ; this tells me the frame rate is 6.67 frames per second. But I'm going to be using this in a program and want it in a parsed format. ffprobe does json, but when I use it :

  



  > ffprobe.exe -show_streams -of json foo.gif


  



  The json shows :

  



  "r_frame_rate": "20/3",
"avg_frame_rate": "20/3",


  



  But I want the decimal form 6.67 instead of 20/3. Is there a way to have FFProbe produce its JSON output in decimal ? I can't seem to find it in the docs.

  



  My platform is Windows ; FFProbe is version N-68482-g92a596f.

  



  I did look into using ImageMagick, but the GIF file in question is corrupted (I'm working on a simple repair program) ; IM's "identify" command halts on it, while FFMpeg & FFProbe handle it just fine.

  



  Addition : this is kind of academic now ; I just used (in Python) :

  



  framerate_as_decimal = "%4.2f" % (float(fractions.Fraction(framerate_as_fraction)))


  



  But I'm still kind of curious if there's an answer.

  


• FFprobe, how to get frame rate of animated gif as a decimal in JSON format

  18 mars 2017, par codingatty

  When I used ffprobe against an animated gif, I get, among other things, this :

  > ffprobe.exe  foo.gif
  
  . . . 
  
  Stream #0:0: Video: gif, bgra, 500x372, 6.67 fps, 6.67 tbr, 100 tbn, 100 tbc

  Great ; this tells me the frame rate is 6.67 frames per second. But I’m going to be using this in a program and want it in a parsed format. ffprobe does json, but when I use it :

  > ffprobe.exe -show_streams -of json foo.gif

  The json shows :

  "r_frame_rate": "20/3",
  
  "avg_frame_rate": "20/3",

  But I want the decimal form 6.67 instead of 20/3. Is there a way to have FFProbe produce its JSON output in decimal ? I can’t seem to find it in the docs.

  My platform is Windows ; FFProbe is version N-68482-g92a596f.

  I did look into using ImageMagick, but the GIF file in question is corrupted (I’m working on a simple repair program) ; IM’s "identify" command halts on it, while FFMpeg & FFProbe handle it just fine.

  Addition : this is kind of academic now ; I just used (in Python) :

  framerate_as_decimal = "%4.2f" % (float(fractions.Fraction(framerate_as_fraction)))

  But I’m still kind of curious if there’s an answer.