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• How to export wave slices to the same bits per sample as the original file

  23 avril 2019, par tzujan

  I am looping through a large wave file, via a dictionary of new file names, lengths and versions. The loop exports the individual slices as files :

  mix.export(key, format='wav')

  However, it converts the original 24-bit file to 32-bit slices. I have been doing a round trip to pro tools to get the files back to 24, as I can’t figure out either ffmpeg settings, or getting the slice into a subprocess.

  I have tried several variations of this theme :

  mix.export(key, format='wav', codec='pcm_s24le')

  As well as this one :

  mix.export(k, format='wav', parameters=['ffmpeg', '-i', '-acodec', 'pcm_s24le', '-ar', '48000'])

  I can’t seem to get the individual slices to work in the following subprocess call. key is the file name from the key-value pair. This works well in the 32-bit export, but not sure how to make it work when a slice’s temp file, such as /var/folders/vc/q7jggn7900l099w45463lgx40000gn/T/tmpw_6mxyg8 needs to be called.

  subprocess.call(['ffmpeg', '-i', key, 
  
                   '-acodec', 'pcm_s24le', '-ar', '48000', 'output.wav'])

  Hoping for slices of the exact same format as the original input :

  mix_file = AudioSegment.from_wav(file_name)

• Asking ffmpeg to extract frames at the original frame rate [closed]

  26 avril 2019, par Amelio Vazquez-Reina

  On the FFmpeg documentation (here, and here) I read that, by default, FFmpeg chooses to extract frames at 25 frames per second (otherwise you can specify a framerate with the -r option)

  My problem is that I have a folder with dozens of videos, each of them recorded at different frame rates, so my question is :

  Is there a way to ask FFmpeg to extract frames from a video at the "native" frame rate (i.e. the original frame rate at which the video was recorded) ?

  In case it matters, I am working with MP4 files

• Problems in making Video from Lottie JSON File and Overlay it with original video using FFMPEG

  26 juin 2019, par Krishna Vyas

  there is some unique concept about processing Lottie Animations using FFMPEG video processing library and MediaCodec. In that, I wants to make video from Lottie animation and overlay that video on other original video.

  But the problem is i’m unable to make a video with transparent background from Lottie animation. So i made simple video from Lottie animation using MediaCodec and MediaMuxer, it takes one by one frame from Lottie Drawable and attach it to the video(Lottie Video). Here is the link about this concept- https://engineering.21buttons.com/how-to-generate-videos-using-lottie-in-android-2db6ecceb2a

  And then i overlay this video to the original video using FFmpeg library. Here FFmpeg does two task, first it makes transparent background in Lottie Video and second it overlays this Lottie Video above the original video.

  And here the actual problem is out, FFmpeg takes more than 8 to 9 minutes in processing of video of 25 seconds, So i wants to get solution for this problem, as i have time limit of only 1 to 2 minutes. Any one has a solution for it or new ides for implementation of this concept, then please tell me i’ll appreciate it.