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• Can't find ffmpeg with python

  16 avril 2017, par Edoardo Centamori

  I’m trying to use the module save from matplotlib.animation.FuncAnimation.
  This is the part of the code I’m referring to :

  import matplotlib.animation as animation
  
  plt.rcParams['animation.ffmpeg_path'] ='/Users/edoardo/Downloads/ffmpeg-3.3/ffmpeg'
  
  ...
  
  """other code"""
  
  ...
  
  ani = animation.FuncAnimation(fig, update_mode, 250,
  
                                 interval=50, blit=False)
  
  ani.save('Resonant_modes.mp4', fps=30, extra_args=['-vcodec', 'libx264'])

  But I get this error as a result :

  ValueError: Cannot save animation: no writers are available.
  
  Please install mencoder or ffmpeg to save animations.

  The problem is that I have installed ffmpeg, so I don’t know what to do.
  Could someone explain to me how to do and where should I move the executable ffmpeg file so than Python can find it easly ?

  Edit 1 :
  I’m using mac os x
  FFmpeg should be installed correctly, here’s the output from Bash :

  MBP-di-Edoardo:~ edoardo$ ffmpeg ffmpeg version 2.8.6 Copyright (c)    
  
  2000-2016 the FFmpeg developers built with gcc 4.8.5 (GCC) 
  
  ...more stuff ... 
  
  Use -h to get full help or, even better, run 'man ffmpeg' –

  Edit 2 :
  I’ve tried moving the file to \bin but even using sudo I can’t

  sudo cp ffmpeg /bin
  
  Password:
  
  cp: /bin/ffmpeg: Operation not permitted
  
  MBP-di-Edoardo:Desktop edoardo$ 

• ffmpeg proress 4444 produce low quality output

  3 mai 2017, par Panupat

  I have a bunch of HQ clips in Proress 4444 format with alpha I’m trying to scale down with ffmpeg. The output do produce the correct alpha, however the quality seems really bad. I’m curious if there’s something wrong with my command ?

  ffmpeg.exe -i in.mov -vf scale=iw/2:-2 -c:v prores_ks -profile:v 4444 -pix_fmt yuva444p10le -alpha_bits 16 out2.mov

  Above, output. Below, source.

  http://imgur.com/a/XYpWp

  I tried to add -colorspace bt709 -color_primaries bt709 -color_trc bt709 but seem to have no effect.

  the log is here - https://docs.google.com/document/d/19TdJwwDp0QD00f_7XB8sBAYMUWUrn2moRuCC6r6rI0k/edit?usp=sharing

  Any help appreciate, thanks !

• FFMPEG concat audio and videos produces only audio

  19 septembre 2019, par justaguytrynabuildawebsite

  Im trying to combine multiple video files with a single audio file. When using only videos without audio, it works fine but when adding a audio track to the beginning of the concat file i get the return below, and the output.mp4 becomes just audio with no video when previewing in browser.
  FFMPEG command

  ffmpeg -f concat -safe 0 -i /var/www/html/video_tool/edit/out/concat.txt -c copy -flags +global_header /var/www/html/video_tool/edit/out/output.mp4

  concat.txt

  #CONCAT FILE
  
  file '/var/www/html/video_tool/edit/audio/sound.mp3'
  
  file '/var/www/html/video_tool/edit/vids/frame_0.mp4'
  
  file '/var/www/html/video_tool/edit/vids/frame_1.mp4'
  
  file '/var/www/html/video_tool/edit/vids/frame_2.mp4'
  
  file '/var/www/html/video_tool/edit/vids/frame_3.mp4'

  Output

  ffmpeg version 4.1.3-0york1~16.04 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  
    configuration: --prefix=/usr --extra-version='0york1~16.04' --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-nonfree --enable-libfdk-aac --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
  
  [mp3 @ 0x5635174e08c0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, concat, from '/var/www/html/video_tool/edit/out/concat.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 192 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
  
  Output #0, mp4, to '/var/www/html/video_tool/edit/out/output.mp4':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 192 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5635174e38c0] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897984, current: 8976; changing to 9897985. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897985, current: 8977; changing to 9897986. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897986, current: 8979; changing to 9897987. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0x5635174e5080] Non-monotonous DTS in output stream 0:0; previous: 9897987, current: 8980; changing to 9897988. This may result in incorrect timestamps in the output file.
  
  etc, etc...
  
  size=    5347kB time=00:03:44.44 bitrate= 195.1kbits/s speed=2.91e+03x    
  
  video:0kB audio:5311kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.664769%