python output video to image ffmpeg scale cropped

If your crop X pixels vertically, you'll have to crop (16/9)X pixels horizontally.

To achieve that, you'll have to crop horizontally as well. The next 420x360x3 bytes afer that will represent the second frame, etc. ffplay -i input.mp4 -vf 'cropinw:inh-25:0:0' If you're watching this full screen, then the display will show black bars if the resized video is not the same aspect ratio as your monitor. Command-line - Compress and Convert MP4 to Webm for YouTube, Ins, Facebook. ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4. Command-line - Compress and Convert H.264 to H.265 for Higher Compression. 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. Here we take some typical command-line examples to show you how to compress MP4 /MOV/4K/MKV video size using FFmpeg.

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. In sp.Popen, the bufsize parameter must be bigger than the size of one frame (see below). 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.

Python output video to image ffmpeg scale cropped