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• aarch64 : vp9itxfm : Reorder iadst16 coeffs

  31 décembre 2016, par Martin Storsjö

  aarch64 : vp9itxfm : Reorder iadst16 coeffs
  This matches the order they are in the 16 bpp version.
  There they are in this order, to make sure we access them in the
  
  same order they are declared, easing loading only half of the
  
  coefficients at a time.
  This makes the 8 bpp version match the 16 bpp version better.
  This is cherrypicked from libav commit
  
  b8f66c0838b4c645227f23a35b4d54373da4c60a.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/vp9itxfm_neon.S

• I have created a commandlist but when I run ffmpeg() it says not defined. Does the ffmpeg() needs the commandlist nested or am I missing something ?

  5 septembre 2022, par jiraiya_sensei

  #/ I have ommited the first half of the code/

  


  def buildFFmpeg():
        commandlist = [
            "ffmpeg",
            "-i",
            inputdic[1],
            "-c:v",
            inputdic[4],
            "-preset",
            inputdic[3],
            "-crf",
            inputdic[2],
            "-q:v",
            inputdic[6],
            "-c:a",
            inputdic[5],
            "-b:a",
            inputdic[7],
            "output.mkv"        
            ]
    
    return commandlist
    
    def runFFmpeg(commandlist):

            print(commandlist)               

            if subprocess.run(commandlist).returncode == 0:

                    print ("FFmpeg Script Ran Successfully")

            else:
                    print ("There was an error running your FFmpeg script")
                    
                
    print('Press 1 to start to encoding or 2 to stop this process')

    start = input('Press to start: ')

    x = int(start)

    if x == 1:
        runFFmpeg(buildFFmpeg())

    else:
         exit()


  


  so with the changes of runFFmpeg() — runFFmpeg(buildFFmpeg()) in line 58 and def runFFmpeg() : — def runFFmpeg(commandlist) : in line45 the code runs successfully. But I would like to understand as to how defining the def runFFmpeg(commandlist) : and executing runFFmpeg(buildFFmpeg()) makes the code work.

  


• FFmpeg encoding to H265

  17 février 2016, par Some1Else

  I read that the new H265 is supposed to have around twice the compression efficiency of H264 and supposed files around half the size http://x265.org/hevc-h265/ All of my results trying to encode to H265 give me larger files than H264 from the same source.

  For H264 I am passing these switches to ffmpeg command line

  -c:v libx264 -preset:v veryslow -profile:v high -crf 15 -pix_fmt yuvj420p -an -y -r 30

  For H265 I am using these switches

  -c:v libx265 -preset:v veryslow -crf 15 -an -y -r 30

  In all tests using a variety of different source frames the H265 always results in a larger file size (and is also much much slower to encode).

  Any tips for H265 ? I want the H265 to look like the same quality as H264 but not result in larger files.

  Thanks.