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• AForge.Video.VideoFileWriter, Video Quality loss after a second

  29 décembre 2019, par Just another Dev

  I tried to use AForge to create mp4 video from images..but experience this quality loss after about 1 - 2 second into the video. Just wondering if anyone knows what went wrong with my code ?

  using AForge.Video.FFMPEG;
  
  VideoFileWriter writer = new VideoFileWriter();
  
  writer.Open(fileName, _width, _height, _frameRate, VideoCodec.MPEG4, 800000);
  
  var s = AForge.Imaging.Image.FromFile(@"[path]\image.jpg");
  
  int frameCount = _frameRate * scene.Time;
  
  for (int i = 0; i < frameCount; i++)
  
  {
  
      writer.WriteVideoFrame(s);
  
  }
  
  writer.Close();

  I use the above code to create a 3 second 1080p video with frame rate 60, bit rate 800k, and using this image as an example : https://www.bushandbeach.co.nz/wp-content/uploads/2019/05/A-Taste-of-Auckland-Full-Day-1-opt.jpg

  the output video is in here : https://youtu.be/j0z7711cyOM

  as you can see the image quality seems to be ok, for about 2 seconds and then it blurs out in the last second.

  Thanks so much

• ffmpeg and libx264 videos do not play on video player

  24 décembre 2019, par Tobi

  for a few months now I encountered a problem using FFmpeg in combination with the video code h264. The video generation works fine and without any errors. I am using the following script since 2015 to build my videos from single pictures :

  #!/bin/bash                                                                     
  
  # ------------------------------------------------------------------------------
  
  #                                                                               
  
  # Video generator                                                               
  
  # Tobias Holzmann                                                               
  
  # Date: 18.03.15                                                                
  
  # Update: 24.12.2019                                                            
  
  # Switch back to ffmpeg from avconv                                             
  
  #                                                                               
  
  # ------------------------------------------------------------------------------
  
  
  
  frameRate=30                                                                    
  
  vcodec="h264"                                                                   
  
  crf=18              # Between 0-51; 23 is default. 0 = lossless                 
  
  
  
  
  
  # ------------------------------------------------------------------------------
  
  
  
  ffmpeg \                                                                        
  
      -f image2 \                                                                 
  
      -r $frameRate \                                                             
  
      -i animation.%4d.png \                                                      
  
      -r $frameRate \                                                             
  
      -crf $crf \                                                                 
  
      -vcodec $vcodec \                                                           
  
      AVideo.flv                                                                  
  
  
  
  
  
  # ------------------------------------------------------------------------------

  Today I made it a bit more fancy and easier to use. However, the problem is, that all videos I generate with h264 do not play at all using the vlc player or the common Ubuntu video player. I get errors such as :

  shorty@animation: vlc AVideo.flv 
  
  VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
  
  [000055c0e70af420] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
  
  [NULL @ 0x7fe318c2c2a0] Invalid NAL unit size (30490 > 15039).
  
  [NULL @ 0x7fe318c2c2a0] missing picture in access unit with size 15733
  
  [h264 @ 0x7fe318c2c2a0] Invalid NAL unit size (30490 > 15039).
  
  [h264 @ 0x7fe318c2c2a0] Error splitting the input into NAL units.
  
  [00007fe324c1c420] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library  430.50  Thu Sep  5 22:38:52 CDT 2019 for hardware decoding
  
  [h264 @ 0x7fe325428ac0] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324c1fb00] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324eb9d80] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ed6080] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ef2400] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324f0e780] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe325428ac0] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324c1fb00] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324eb9d80] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ed6080] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ef2400] hardware accelerator failed to decode picture
  
  [00007fe324c1c420] main decoder error: buffer deadlock prevented
  
  [h264 @ 0x7fe324f0e780] hardware accelerator failed to decode picture
  
  ...
  
  ...

  I am wondering if someone does know where the problem is located. Any hint or feedback is appreciated. Thank you in advance and kind regards, Tobi.

• pydub not encoding file correctly

  21 décembre 2019, par geoffr98

  I’m trying to use pydub to take an audio stream in opus format and save it as a wav. I am currently using a file instead of a stream and it is not working.

  My code :

  myfile = open("Short_Test.opus", 'rb')
  
  opus_audio_bytes = myfile.read()
  
  myfile.close()
  
  opus_data = BytesIO(opus_audio_bytes)
  
  sound = AudioSegment.from_file(opus_data, codec="ogg")
  
  print("Export now")
  
  mywave_file = sound.export("mashup.wav","16k")

  It does create mashup.wav, however it is not created correctly. Here is the log output from pydub :

  subprocess.call(['ffmpeg', '-y', '-i', '-', '-acodec', 'pcm_s32le', '-vn', '-f', 'wav', '-'])
  
  
  
  Export now
  
  
  
  subprocess.call(['ffmpeg', '-y', '-f', 'wav', '-i', 'C:\\Users\\Geoff\\AppData\\Local\\Temp\\tmppjaomlf6', '-f', '16k', 'C:\\Users\\Geoff\\AppData\\Local\\Temp\\tmp3tserc9q'])
  
  subprocess output: b'ffmpeg version git-2019-12-19-99f505d Copyright (c) 2000-2019 the FFmpeg developers'
  
  subprocess output: b'  built with gcc 9.2.1 (GCC) 20191125'
  
  subprocess output: b'  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf'
  
  subprocess output: b'  libavutil      56. 36.101 / 56. 36.101'
  
  subprocess output: b'  libavcodec     58. 65.100 / 58. 65.100'
  
  subprocess output: b'  libavformat    58. 35.101 / 58. 35.101'
  
  subprocess output: b'  libavdevice    58.  9.101 / 58.  9.101'
  
  subprocess output: b'  libavfilter     7. 69.101 /  7. 69.101'
  
  subprocess output: b'  libswscale      5.  6.100 /  5.  6.100'
  
  subprocess output: b'  libswresample   3.  6.100 /  3.  6.100'
  
  subprocess output: b'  libpostproc    55.  6.100 / 55.  6.100'
  
  subprocess output: b'Guessed Channel Layout for Input Stream #0.0 : mono'
  
  subprocess output: b"Input #0, wav, from 'C:\\Users\\Geoff\\AppData\\Local\\Temp\\tmppjaomlf6':"
  
  subprocess output: b'  Duration: 00:00:06.90, bitrate: 1536 kb/s'
  
  subprocess output: b'    Stream #0:0: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s32, 1536 kb/s'
  
  subprocess output: b"[NULL @ 0000021fd2900580] Requested output format '16k' is not a suitable output format"
  
  subprocess output: b'C:\\Users\\Geoff\\AppData\\Local\\Temp\\tmp3tserc9q: Invalid argument'
  
  Traceback (most recent call last):
  
    File "C:/Users/Geoff/Documents/Geoff-Microsemi(Other)/Smart-OR/Savant_V1/Cobalt/G_opus_Cobalt.py", line 176, in <module>
  
      mywave_file = sound.export("mashup.wav","16k")
  
    File "C:\Users\Geoff\AppData\Local\Programs\Python\Python37\lib\site-packages\pydub\audio_segment.py", line 877, in export
  
      p.returncode, conversion_command, p_err))
  
  pydub.exceptions.CouldntEncodeError: Encoding failed. ffmpeg/avlib returned error code: 1
  
  </module>

  Command :[’ffmpeg’, ’-y’, ’-f’, ’wav’, ’-i’, ’C :\Users\Geoff\AppData\Local\Temp\tmppjaomlf6’, ’-f’, ’16k’, ’C :\Users\Geoff\AppData\Local\Temp\tmp3tserc9q’]

  Output from ffmpeg/avlib :

  b"ffmpeg version git-2019-12-19-99f505d Copyright (c) 2000-2019 the FFmpeg developers\r\n  built with gcc 9.2.1 (GCC) 20191125\r\n  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf\r\n  libavutil      56. 36.101 / 56. 36.101\r\n  libavcodec     58. 65.100 / 58. 65.100\r\n  libavformat    58. 35.101 / 58. 35.101\r\n  libavdevice    58.  9.101 / 58.  9.101\r\n  libavfilter     7. 69.101 /  7. 69.101\r\n  libswscale      5.  6.100 /  5.  6.100\r\n  libswresample   3.  6.100 /  3.  6.100\r\n  libpostproc    55.  6.100 / 55.  6.100\r\nGuessed Channel Layout for Input Stream #0.0 : mono\r\nInput #0, wav, from 'C:\\Users\\Geoff\\AppData\\Local\\Temp\\tmppjaomlf6':\r\n  Duration: 00:00:06.90, bitrate: 1536 kb/s\r\n    Stream #0:0: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s32, 1536 kb/s\r\n[NULL @ 0000021fd2900580] Requested output format '16k' is not a suitable output format\r\nC:\\Users\\Geoff\\AppData\\Local\\Temp\\tmp3tserc9q: Invalid argument\r\n"

  I am confused as to why it isn’t working because the following ffmpeg command on the command line works, so I’m sure it’s my parametes in pyusb :

  ffmpeg -i Short_Test.opus -b:a 16000 mashup.wav

  Any ideas as to how to fix my problem ?