Recherche avancée

Sur d’autres sites (8529)

• How to add current UTC Time in MKV file metadata using ffmpeg ?

  1er mai 2022, par Shahpari

  I am not sure if it's possible, but is there anyway we can add current UTC time inside the mkv metatag using ffmpeg ? i read https://wiki.multimedia.cx/index.php?title=FFmpeg_Metadata but i could not find anything.

  


  -metadata "Creation Time"="Need to add time tag/code"


  


  output will show

  


  Creation Time: UTC 2020-06-04 02:40:29


  


• FFMPEG x264 (fourcc=0x21) codec is not working with OpenCV

  6 mars 2020, par dkac

  I'm trying to use mp4 format coding (fourcc=0x21) on OpenCV 3.2 without success. Probably I have a problem with my Ubuntu 18.04 setup but currently I'm running out of ideas how to fix it. First, I recompiled FFMPEG with x264 support. Than, recompiled OpenCV (with contrib and OPENCV_ENABLE_NONFREE=ON, WITH_FFMPEG=ON). It is still not working.

  



  I cannot use fourcc different than 0x21. I mean.. I cannot use another codec.

  



  Example :

  



  >>> import cv2
>>> out = cv2.VideoWriter('output.mp4', 0x21, 20.0, (640,480))
OpenCV: FFMPEG: tag 0x00000021/'!???' is not found (format 'mp4 / (null)')'


  



  However, this is working fine (other fourcc, codec) :

  



  >>> out = cv2.VideoWriter('output.mp4',0x31637661 , 20.0, (640,480))


  



  OpenCV compiled with FFMPEG support (version 3.2), cmake config :

  



  Video I/O:
DC1394 1.x:                  NO
DC1394 2.x:                  YES (ver 2.2.5)
FFMPEG:                      YES
  avcodec:                   YES (ver 57.107.100)
  avformat:                  YES (ver 57.83.100)
  avutil:                    YES (ver 55.78.100)
  swscale:                   YES (ver 4.8.100)
  avresample:                YES (ver 3.7.0)


  



  FFMPEG build with x264 support :

  



  ffmpeg -version
ffmpeg version N-96891-g60b1f85 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
configuration: --prefix=/home/user/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/user/ffmpeg_build/include --extra-ldflags=-L/home/user/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/user/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil      56. 42.100 / 56. 42.100
libavcodec     58. 73.102 / 58. 73.102
libavformat    58. 39.101 / 58. 39.101
libavdevice    58.  9.103 / 58.  9.103
libavfilter     7. 77.100 /  7. 77.100
libswscale      5.  6.100 /  5.  6.100
libswresample   3.  6.100 /  3.  6.100
libpostproc    55.  6.100 / 55.  6.100


  



  FFMPEG x264 simple conversion test is working :

  



  ffmpeg -i in.mp4 -vcodec libx264 -f mp4 out.mp4y
ffmpeg version N-96891-g60b1f85 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
configuration: --prefix=/home/user/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/user/ffmpeg_build/include --extra-ldflags=-L/home/user/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/user/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil      56. 42.100 / 56. 42.100
libavcodec     58. 73.102 / 58. 73.102
libavformat    58. 39.101 / 58. 39.101
libavdevice    58.  9.103 / 58.  9.103
libavfilter     7. 77.100 /  7. 77.100
libswscale      5.  6.100 /  5.  6.100
libswresample   3.  6.100 /  3.  6.100
libpostproc    55.  6.100 / 55.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf57.83.100
Duration: 00:00:10.00, start: 0.000000, bitrate: 3826 kb/s
 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x960, 3825 kb/s, 10 fps, 10 tbr, 10240 tbn, 20 tbc (default)
Metadata:
  handler_name    : VideoHandler
File 'out.mp4y' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))


  


• Matplotlib can not save animation

  1er avril 2020, par Justin Furuness

  I have a matplotlib animation and it will not save. If I do not save it, it runs totally fine and without error. When I try to save it errors with a message that is not helpful. I have googled this error and checked everything, but I cannot seem to find an answer to this problem. I have installed ffmpeg. Am I doing something wrong that is obvious ? I am running on ubuntu 19.10 with matplotlib 3.2.1 if that matters.

  



  The code to save the animation is below :

  



      def run_animation(self, total_rounds):
        anim = animation.FuncAnimation(self.fig, self.animate,
                                       init_func=self.init,
                                       frames=total_rounds * 100,
                                       interval=40,
                                       blit=True)
#        Writer = animation.writers['ffmpeg']
#        writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)
        anim.save('animation.mp4')


  



  The error traceback :

  



  2020-04-01 02:20:58,279-INFO: MovieWriter._run: running command: ffmpeg -f rawvideo -vcodec rawvideo -s 1200x500 -pix_fmt rgba -r 25.0 -loglevel error -i pipe: -vcodec h264 -pix_fmt yuv420p -y animation.mp4
Traceback (most recent call last):
  File "/home/anon/.local/lib/python3.7/site-packages/matplotlib/backend_bases.py", line 2785, in _wait_cursor_for_draw_cm
    self.set_cursor(cursors.WAIT)
  File "/home/anon/.local/lib/python3.7/site-packages/matplotlib/backends/backend_gtk3.py", line 468, in set_cursor
    self.canvas.get_property("window").set_cursor(cursord[cursor])
AttributeError: 'NoneType' object has no attribute 'set_cursor'


  



  Thanks a million for your help