Getting video dimension / resolution / width x height from ffmpeg

Question

How would I get the height and width of a video from ffmpeg\'s information output. For example, with the following output:

$ ffmpeg -i video.mp4         


        

Answer 1

In this blog post theres a rough solution in python:

import subprocess, re
pattern = re.compile(r'Stream.*Video.*([0-9]{3,})x([0-9]{3,})')

def get_size(pathtovideo):
    p = subprocess.Popen(['ffmpeg', '-i', pathtovideo],
                         stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE)
    stdout, stderr = p.communicate()
    match = pattern.search(stderr)
    if match:
        x, y = map(int, match.groups()[0:2])
    else:
        x = y = 0
    return x, y

This however assumes it's 3 digits x 3 digits (i.e. 854x480), you'll need to loop through the possible dimension lengths, such as (1280x720):

possible_patterns = [re.compile(r'Stream.*Video.*([0-9]{4,})x([0-9]{4,})'), \
            re.compile(r'Stream.*Video.*([0-9]{4,})x([0-9]{3,})'), \
re.compile(r'Stream.*Video.*([0-9]{3,})x([0-9]{3,})')]

and check if match returns None on each step:

for pattern in possible_patterns:
    match = pattern.search(stderr)
    if match!=None:
        x, y = map(int, match.groups()[0:2])
        break

if match == None:
    print "COULD NOT GET VIDEO DIMENSIONS"
    x = y = 0

return '%sx%s' % (x, y)

Could be prettier, but works.