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• FFMPEG not executing fully through python code but works from cmd

  3 mars 2020, par Shaun Micallef

  I am new to python and am trying to execute a cmd command using python like the following :

  os.system('cmd /c "ffmpeg -i {} -t 00:30 {}"'.format(videURLlink, video_name))

  when executing the above on my laptop it is working but on my pc it is not. the below is the result of the command execution but it doesn’t continue and stops there

  ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --disable-static --enable-shared --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-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  [hls @ 0000016fa1800fc0] Skip ('#EXT-X-VERSION:3')
  
  [hls @ 0000016fa1800fc0] Opening 'https://hddn01.skylinewebcams.com/02900101X8TS-1583232346899.ts' for reading
  
  [hls @ 0000016fa1800fc0] Opening 'https://hddn01.skylinewebcams.com/02900101X8TS-1583232354899.ts' for reading
  
  [hls @ 0000016fa1800fc0] Could not find codec parameters for stream 1 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, hls, from 'https://hddn01.skylinewebcams.com/live.m3u8?a=bmnvut6ok8qfirptmtgu2j37c5':
  
    Duration: N/A, start: 18396.450000, bitrate: N/A
  
    Program 0 
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x1024, 12 fps, 12 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:1: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
  
      Metadata:
  
        variant_bitrate : 0

  I am using anaconda as the python interpreter and migrated the environment from my laptop to my pc.If I execute the cmd directly through cmd it works. Any idea why ?

• What difference does it make which version of Mozilla, MacOS and Safari we specify for using ffmpeg ?

  3 mars 2020, par Kaizer Sozay

  I came across this snippet of code for downloading m3u8 playlists and concatenating them into an mkv file :

  $ ffmpeg -user_agent "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/601.7.8 (KHTML, like Gecko) Version/9.1.3 Safari/537.86.7" -i https://devstreaming-cdn.apple.com/videos/wwdc/2019/901myoscpux9y7nry55/901/hls_vod_mvp.m3u8 -c copy pd.mkv

  My question is about the section of the script :

  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/601.7.8 (KHTML, like Gecko) Version/9.1.3 Safari/537.86.7"

  These seem like very old numbers. For example, Catalina is 10.15.3. No idea which is the latest Mozilla but Safari is now on 13.0.5

  Was just wondering if it makes any difference if the version is old, or if we should update to the code to specify newer versions of Mac OS, Mozilla, Webkit and Safari.

  Can someone explain the significance ?

• Burn subtitles in a stop motion video, with hardware acceleration

  9 février 2020, par Belinde

  I’m trying to make a year long stop motion video with the images taken from a webcam. I’ve created a input.txt file with this format inside :

  ffconcat version 1.0
  
  
  
  file 'amianthe201909031230.jpg'
  
  duration 0.093034825870647
  
  
  
  file 'amianthe201909031330.jpg'
  
  duration 0.093034825870647

  The command I’ve crafted (mostly taken from the example in the official ffmpeg documentation) is :

  ffmpeg \
  
      -y \
  
      -hwaccel vaapi \
  
      -hwaccel_device /dev/dri/renderD128 \
  
      -hwaccel_output_format vaapi \
  
      -f concat \
  
      -i input.txt \
  
      -vf 'hwmap=mode=read+write+direct,format=nv12,ass=subtitles.ass,hwmap' \
  
      -c:v h264_vaapi \
  
      ~/amianthe.mp4

  But it badly fails with this output :

  ffmpeg version 4.1.4-1build2 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9 (Ubuntu 9.2.1-4ubuntu1)
  
    configuration: --prefix=/usr --extra-version=1build2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, concat, from 'input.txt':
  
    Duration: 00:00:18.70, start: 0.000000, bitrate: 5 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (h264_vaapi))
  
  Press [q] to stop, [?] for help
  
  [Parsed_ass_2 @ 0x5557f4ec4ac0] Shaper: FriBidi 0.19.7 (SIMPLE) HarfBuzz-ng 2.6.1 (COMPLEX)
  
  [Parsed_ass_2 @ 0x5557f4ec4ac0] Using font provider fontconfig
  
  [Parsed_ass_2 @ 0x5557f4ec4ac0] Added subtitle file: 'subtitles.ass' (4 styles, 2 events)
  
  [Parsed_hwmap_3 @ 0x5557f5381ec0] Unsupported formats for hwmap: from nv12 (vaapi_vld) to vaapi_vld.
  
  [Parsed_hwmap_3 @ 0x5557f5381ec0] Failed to configure output pad on Parsed_hwmap_3
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!

  I’m honestly lost : from my understanding, all the elaboration should be done directly in the video card memory, so I don’t understand why it’s converting the surface format. Is there some other parameter I must put in format ? What am I missing ?