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The next 420x360x3 bytes afer that will represent the second frame, etc.

If the video has a size of 420x320 pixels, then the first 420x360x3 bytes outputed byįFMPEG will give the RGB values of the pixels of the first frame, line by line, top to bottom. Now we just have to read the output of FFMPEG. It can be omitted most of the time in Python 2 but not in Python 3 where its default value is pretty small. Alternatively, we can pipe the output and return it as an output instead of writing it to a file.

In sp.Popen, the bufsize parameter must be bigger than the size of one frame (see below). Piping the FFmpeg output Assuming a simple task of converting an mp3 file to a wave using FFmpeg, which can be done using the following shell command: ffmpeg -i mp3path -o wavpath This results in a wave file saved under wavpath. The format image2pipe and the - at the end tell FFMPEG that it is being used with a pipe by another program. In the code above -i myHolidays.mp4 indicates the input file, while rawvideo/rgb24 asks for a raw RGB output. Import subprocess as sp command = pipe = sp.