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• avcodec/pngenc : support writing iCCP chunks

  11 mars 2022, par Niklas Haas

  avcodec/pngenc : support writing iCCP chunks
  We re-use the PNGEncContext.zstream for deflate-related operations.
  
  Other than that, the code is pretty straightforward. Special care needs
  
  to be taken to avoid writing more than 79 characters of the profile
  
  description (the maximum supported).
  To write the (dynamically sized) deflate-encoded data, we allocate extra
  
  space in the packet and use that directly as a scratch buffer. Modify
  
  png_write_chunk slightly to allow pre-writing the chunk contents like
  
  this.
  Also add a FATE transcode test to ensure that the ICC profile gets
  
  encoded correctly.
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] libavcodec/pngenc.c
  • [DH] tests/fate/image.mak
  • [DH] tests/ref/fate/png-icc

• WinError 6 handle not valid

  31 août 2019, par Patrick

  Hy Community,

  I know that a lot of Threads have opened regarding WinError6, but i still not able to solve this error.

  before I had this error only in for loops after (i estimate) around 60-100 cycles.

  now i tried to update all packages including pip.

  now the error is present immediately when for loop starts.

  my imports :
  moviepy, ffmpeg, pyaudio, os, shutil, opencv2, google-API

  thank you in advance.

  cmd = [get_setting("FFMPEG_BINARY"), "-y", "-i", inputfile, "-ab", "%dk"%bitrate,
  
       "-ar", "%d"%fps,'-ac','1', output] 
  
  subprocess_call(cmd)

  Traceback (most recent call last) :

  File "C :\Users\zfp\Documents\unite__main_test_neu.py", line 52, in
  extract_audio_wav.extract_audio_wav(new_path,
  "t_video"+x+".mp4", new_path, "t_audio"+x+".wav", 1411, frequency)

  File "C :\Users\zfp\Documents\unite\extract_audio_wav.py", line 23, in
  extract_audio_wav audio(path_in,path_out,bitrate,frequency)

  File "C :\Users\zfp\Documents\unite\ffmpeg.py", line 59, in
  ffmpeg_extract_audio subprocess_call(cmd)

  File
  "C :\Users\zfp\AppData\Local\Programs\Python\Python37\lib\site-packages\moviepy\tools.py",
  line 46, in subprocess_call proc = sp.Popen(cmd, **popen_params)

  File
  "C :\Users\zfp\AppData\Local\Programs\Python\Python37\lib\subprocess.py",
  line 664, in __init___cleanup()

  File
  "C :\Users\zfp\AppData\Local\Programs\Python\Python37\lib\subprocess.py",
  line 228, in _cleanup res =
  inst._internal_poll(_deadstate=sys.maxsize)

  File
  "C :\Users\zfp\AppData\Local\Programs\Python\Python37\lib\subprocess.py",
  line 1216, in _internal_poll if _WaitForSingleObject(self._handle, 0)
  == _WAIT_OBJECT_0 :

  OSError : [WinError 6] Das Handle ist ungültig

  EDIT :
  im working with Python IDLE -> where this fail occurs

  now i tried same code with PyCharm with normal "Run" —> failed too

  With PyCharm "Debug Run" -> no error occurs and code run stable

• ffmpeg library - why does the Bitrate parameter change on encoding, and how do I force to preserve it ?

  22 avril 2021, par QRrabbit

  Hello forum and all the members of the community !

  


  I have this question on ffmpeg library, why does the bitrate parameter not retained after encoding, even though I explicitly specify the desired rate.

  


  Input file ffprobe :

  


    Duration: 00:00:10.01, start: 0.000000, bitrate: 534719 kb/s
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), argb(progressive), 1920x1080, 533881 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      creation_time   : 2021-04-13T16:35:16.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : Animation
      timecode        : 00:00:00;00


  


  Here's the command I run :

  


  ffmpeg -i input.mov -map 0:a? -map 0:s? -pix_fmt argb -b:v 533881667 -maxrate 533881667 -minrate 533881667 -r 29.97 -top 1 -color_range 1 -colorspace 1 -color_primaries 1 -color_trc bt709 -map_metadata 0 -c:a copy -timecode 00:00:00.00 -c:v qtrle -c:s copy output.mov


  


  Output file ffprobe :

  


    Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    creation_time   : 2021-04-13T16:35:16.000000Z
  Duration: 00:00:10.01, start: 0.000000, bitrate: 100126 kb/s
    Stream #0:0: Video: qtrle (rle  / 0x20656C72), argb(progressive), 1920x1080, 100133 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 11988 tbn, 11988 tbc (default)
    Metadata:
      creation_time   : 2021-04-13T16:35:16.000000Z
      handler_name    : VideoHandler
      encoder         : Lavf58.58.100
      timecode        : 00:00:00;00


  


  As it is visible from the ffprobe from above, I go from :

  


  The Input's file bitrate : 534719 kb/s
to Output bitrate : 100126 kb/s