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• amfenc : Fail to open if the user-supplied device is not usable

  14 avril 2018, par Mark Thompson

  amfenc : Fail to open if the user-supplied device is not usable
  If the user supplies a device or frames context then it is an error
  
  not to use it ; this is consistent with other hardware components.
  Also factorise out the D3D11 initialisation and improve error
  
  messages.
  

  • [DH] libavcodec/amfenc.c

• not able to open image generated by ffmpeg

  26 avril 2018, par user3745870

  I am trying to get images from the video stream using ffmpeg in python and I need the raw bytes to do further things. I am trying to store the raw bytes in image file so if my file opens then I can confirm that the raw bytes I have got are correct.

  import subprocess as sp
  
  
  
  def getImages(self):
  
    cmd = ['ffmpeg',
  
             '-ss', 2,
  
             '-i', url,
  
             '-t', 2,
  
             '-f', 'image2pipe',
  
             '-s', '420x360',
  
             '-pix_fmt', 'rgb24',
  
             '-vcodec', 'rawvideo',
  
             '-vf', 'fps=fps=1', '-']
  
    pipe = sp.Popen(cmd, stdout = sp.PIPE, bufsize=10**8)
  
    raw = pipe.stdout.read(420*360)
  
    file = open('image.jpg','wb')
  
    file.write(raw)

  I see a file image.jpg but I cannot open it. Is there anything wrong I am doing here ? I am sizing the image to be 420*360 bytes so I am assuming that the first 420*360 bytes are belong to the first frame.

  Thanks in advance !

• ffmpeg : Cannot open libx265 encoder. Error initializing output stream 0:0 — Error while opening encoder for output stream #0:0

  16 mai 2018, par bnge

  Sorry for my bad English. I am trying to use ffmpeg to convert some image to heic format. Most of them were succeeded, but some large jpeg (seems only jpeg, png will be okay) files not.

  How can I improve my command to compatible all my images, so I can convert them automatically ?

  ➜  ~ ffmpeg -i sample.jpg -crf 12 -preset placebo -pix_fmt yuv420p -f hevc bitstream.265
  
  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 9.1.0 (clang-902.0.39.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, image2, from 'sample.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 5226869 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 13333x4200, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> hevc (libx265))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x7fd2e3006000] deprecated pixel format used, make sure you did set range correctly
  
  x265 [info]: HEVC encoder version 2.7
  
  x265 [info]: build info [Mac OS X][clang 9.0.0][64 bit] 8bit+10bit+12bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  x265 [error]: Picture width must be an integer multiple of the specified chroma subsampling
  
  [libx265 @ 0x7fd2e2802a00] Cannot open libx265 encoder.
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!