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• How To create .webm video from MP4 file while file uploaded in website [closed]

  28 août 2020, par Den Jarwo

  Can Someone help me how to create .webm video from MP4 file,(etc) while file uploaded from every users in my website.

  

  


  I Need Like this :

  


  1. i am uploaded MP4 or other file video format, and while uploaded the video automatically generateing .webm file.

  


  2. the generated (.webm) file will take 10sec duration for descripting video from start till end of video with small size file.

  


  3. and generating 1 or 4 .jpg image (optional for choice image for thumbnail video).

  

  

  


  I am work with framework Ci4, HTML5, CSS, Jquery and JavaScript

  


• ffmpeg : adding an audio file to a video at specified delays

  15 juillet 2020, par JarsOfJam-Scheduler

  I have an array that may contain multiple occurrences of these terms : 'video, forest'. An audio file is added to the video file when the current element of this array I iterate is 'forest'. Otherwise, not. 'video and forest' elements will increment (of 5 seconds) the delay at which an audio file will be added. Example : the array contains "video, video, forest, video, forest". The first audio file will be added at delay=15000ms. The last one, at 25000ms. Computation details : 0 (initialization) + 5000 (video) + 5000 (video) + 5000 (forest) + 5000 (video) + 5000 (forest). 5000 + 5000 + 5000 = 15000. 5000*5 = 25000.

  


  I use ffmpeg to implement this program. The problem is that only one audio file is added, at the beginning of my video file. So the delays are not actually taken into account I think.

  


  Note that the video file also contains a music. The audio files that I try to add must be present in the video file in addition to this music. The first line of the following code adds the music to the video. The next lines try to add the audio files at good delays.

  


  subprocess.call(
    ['C:/Users/XYZ/Downloads/ffmpeg/bin/ffmpeg.exe', '-i', 'XYZ/my_XYZ_video.webm', '-stream_loop', '-1', '-i', 'tmp_music/original_music.wav',
     '-c:v', 'copy', '-shortest', '-fflags', '+shortest', '-max_interleave_delta', '100M',
     'XYZ/my_XYZ_video_with_music.webm']
    , cwd='C:/Users/XYZ/Desktop/XYZ/')

chosen_songs = ['video', 'forest', 'forest', 'video']

time_for_ffmpeg = 0
for chosen_song in chosen_songs:
    if chosen_song == 'video':
        print('video')
        print(time_for_ffmpeg)
        time_for_ffmpeg += 2000    

    elif chosen_song == 'forest':
        print('forest')
        print(time_for_ffmpeg)
        subprocess.call(
            ['C:/Users/XYZ/Downloads/ffmpeg/bin/ffmpeg.exe', '-i', 'XYZ/my_XYZ_video_with_music.webm', '-i', 'tmp_music/forest.mp3',
             '-filter_complex',
             '[1]adelay=' + str(time_for_ffmpeg) + '|' + str(time_for_ffmpeg) + '[a1];[0][a1]amix', '-c:v', 'copy',
             'XYZ/my_XYZ_video_with_music_with_songs.webm']
            , cwd='C:/Users/XYZ/Desktop/XYZ/')
        time_for_ffmpeg += 5000
    


  


  My question

  


  Why can't I add the audio files corresponding to the forest the specified delays (implemented by the variable time_for_ffmpeg`) ? How could I fix my code ?

  


• Revision 325e0aa650 : Special handle on DC only inverse 8x8 2D-DCT This commit enables a special hand

  26 juillet 2013, par Jingning Han

  Changed Paths :
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/common/vp9_rtcd_defs.sh

  
   Modify /vp9/common/x86/vp9_idct_intrin_sse2.c

  
   Modify /vp9/decoder/vp9_idct_blk.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
  
  Special handle on DC only inverse 8x8 2D-DCT

  This commit enables a special handle for the 8x8 inverse 2D-DCT,
  where only DC coefficient is quantized to be non-zero. For bus_cif
  at 2000 kbps, it provides about 1% speed-up at speed 0.

  Change-Id : I2523222359eec26b144cf8fd4c63a4ad63b1b011