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• Revision 533470c998 : add unit test for datarate control Adds some basic datarate control tests.. Ch

  30 octobre 2012, par Jim Bankoski

  Changed Paths : Add /test/datarate_test.cc Modify /test/test.mk add unit test for datarate control Adds some basic datarate control tests.. Change-Id : I6eff18aa58ef7cfd14886c6b1e048247cd1ad247

• FFMPEG command not working on MP4 files as expected

  21 février 2020, par DavidB

  I am trying to set the output time offset for mp4 file.

  ffmpeg -ss 13.554000 -i input.mp4 -c copy -t 10 -output_ts_offset 13.554000 output.mp4

  This code works for WEBM file as expected but not for MP4.
  In webm it delays start time of video to the specified timestamp and duration is 23.554 but in mp4 it just cuts the video, start time is set to 0 and duration is 10
  Cannot find what is problem.

  ffmpeg -ss 12.960000 -i v.mp4 -c copy -t 10  -output_ts_offset 12.960000 output.mp4
  
  ffmpeg version git-2019-12-26-b0d0d7e Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20191125
  
    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
  
    libavutil      56. 37.100 / 56. 37.100
  
    libavcodec     58. 65.100 / 58. 65.100
  
    libavformat    58. 35.101 / 58. 35.101
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 69.101 /  7. 69.101
  
    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 'v.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01T00:00:00.000000Z
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:29.57, start: 0.000000, bitrate: 1421 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1032 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.35.101
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 1032 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  250 fps=0.0 q=-1.0 Lsize=    1687kB time=00:00:09.99 bitrate=1382.7kbits/s speed=2.21e+03x
  
  video:1212kB audio:468kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.408804%``` 

• expected str, bytes or os.PathLike object, not NoneType for subprocess of ffmpeg

  15 janvier 2024, par ejmin ejoni

  I dont know much about ffmpeg, subprocess and its functions, im trying to take a screenshot form a video and save it at my other field of my model.
this is my model :

  


  class SubSong(models.Model):
song = models.ForeignKey(SongPage, on_delete=models.CASCADE, related_name='related_song')
create = jmodels.jDateField(auto_now_add=True)
user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='related_user')
video = models.FileField(upload_to='sub_video/',)
like = models.ManyToManyField(User, blank=True, )
total_like = models.PositiveIntegerField(default=0)
is_allowed = models.BooleanField(default=False)
image_sub = ThumbImage(upload_to='sub_songs/', default='1.jpg')

def __str__(self):
    return self.song.title


  


  and views.py

  


      if request.method == 'POST':
    authen(request)
    form = MyTryForm(request.POST, request.FILES)
    if form.is_valid():
        data = form.cleaned_data
        x = SubSong.objects.create(song_id=id,
                                   user_id=request.user.id,
                                   video=data['video'], )
        path = x.video.name
        out = path.replace('sub_video/', '').replace('mp4', 'jpg')
        z=subprocess.check_output(
            ffmpeg.input('media/' + path, ss='00:00:50').filter(
                'thumbnail').output('media/sub_songs/' + out, vframes=1).run(), text=True)
        x.image_sub=z
        x.save()
        messages.success(request, 'ویدیوی شما با موفقیت ارسال شد ، پس از بررسی منتشر خواهد شد')
        return redirect(request.META.get('HTTP_REFERER'))

    else:
        messages.error(request, 'ویدیوی شما بارگداری نشد')
        return redirect(request.META.get('HTTP_REFERER'))


  


  it can save the video and also default picture 1.jpg at image_sub. also it can save scrrenshot at the media/sub_song/.but my problem is that it gives me error :
expected str, bytes or os.PathLike object, not NoneType
how i should return the screen from subprocess to save it as my image_sub field ? and why do this error raise ? i dont want to see this error again