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• configure : Use indirection for the -o assembler flag also for x86asm

  14 mars 2018, par Diego Biurrun

  configure : Use indirection for the -o assembler flag also for x86asm
  Similar indirections are used for the -o compiler/assembler flag to
  
  account for differences in compiler/assembler syntax. For x86asm half
  
  the infrastructure for doing the same currently exists unused.
  
  Finish and use that infrastructure for consistency.
  

  • [DBH] configure

• 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.

• 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.