How to find frames per second of any video file?

This will tell you the framerate if it's not variable framerate:

ffmpeg -i filename

Sample output with filename obscured:

Input #0, matroska,webm, from 'somerandom.mkv':
  Duration: 01:16:10.90, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: h264 (High), yuv420p, 720x344 [PAR 1:1 DAR 90:43], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
    Stream #0.1: Audio: aac, 48000 Hz, stereo, s16 (default)

ffmpeg -i filename 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p"

Someone edited with one that didn't quite work the way I wanted. It's referenced here
Additional edit...If you want the tbr value this sed line works

sed -n "s/.*, \(.*\) tbr.*/\1/p"

ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate infile

Result:

2997/100

Here is a python function based on Steven Penny's answer using ffprobe that gives exact frame rate

ffprobe 'Upstream Color 2013 1080p x264.mkv' -v 0 -select_streams v -print_format flat -show_entries stream=r_frame_rate

import sys
import os
import subprocess
def get_frame_rate(filename):
    if not os.path.exists(filename):
        sys.stderr.write("ERROR: filename %r was not found!" % (filename,))
        return -1         
    out = subprocess.check_output(["ffprobe",filename,"-v","0","-select_streams","v","-print_format","flat","-show_entries","stream=r_frame_rate"])
    rate = out.split('=')[1].strip()[1:-1].split('/')
    if len(rate)==1:
        return float(rate[0])
    if len(rate)==2:
        return float(rate[0])/float(rate[1])
    return -1

Retrieve the average frame-rate, given as a fraction:

fraction=$(ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=nw=1:nk=1 "${input}")

Then divide it by rounding to the nearest integer:

python -c "print (round(${fraction}))"

The alternative to command line, is looking at the properties of your file via context menu in Nautilus (graphical file manager). For audio/video files you get an additional tab there with extra informations.

This is a python script to do this using mplayer, in case anyone is interested. It is used path/to/script path/to/movie_name1 path/to/movie/name2 etc

#!/usr/bin/python
# -*- coding: utf-8 -*-

import subprocess
import re
import sys

pattern = re.compile(r'(\d{2}.\d{3}) fps')
for moviePath in sys.argv[1:]:
    mplayerOutput = subprocess.Popen(("mplayer", "-identify", "-frames", "0", "o-ao", "null", moviePath), stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0]
    fps = pattern.search(mplayerOutput).groups()[0]
    print fps

I usually use exiftool to get info of any file type... For example with command exiftool file.swf I can know the framerate of any swf file, something I cannot achieve with ffmpeg

Uses the stats script bundled by default with MPV. So just play the file with MPV and press i. A bunch of statistics including framerate will appear.

ffprobe <media> 2>&1| grep ",* fps" | cut -d "," -f 5 | cut -d " " -f 2

You can right click the target file, Properties, Audio/Video but you will not get the exact framerate. To get a precise framerate you can install MediaInfo.