LinuxQuestions.org - need video dimensions

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need video dimensions

I wrote a little program(in python) that makes a mplayer.movie.conf file. this file tells mplayer a specified amount to crop that movie. My program depends of the data widthxheight of the original movie. I am currently useing the program avitype to get this info. The limitation to this method is it only works on avi files not .mp4(I think quictime) files.

I think i could use mplayer somehow to get this data. for example when mplayer plays a mp4 file it gives this output

Code:

MOV: longest streams: A: #3 (274000 samples)  V: #2 (140148 samples)

VIDEO:  [mp4v]  704x368  0bpp  23.976 fps    0.0 kbps ( 0.0 kbyte/s)

==========================================================================

my needed data, 704x368, is being produced, but I have no way of getting it.

I have tried

Code:

mplayer movie.mp4 > file

this does not work well because this file keeps getting ammended until the movie ends.

If their was an option like this it would be great

Code:

mplayer --info_only movie.mp4

is there a way using mplayer, or any other lib or program to get the dimensions of an .mp4 file.

I would prefer to do this with python, but may be able to use a c extensible module, or just a program like avitype.

edit added later//

I have thought about using pymedia, but can't get it to build

Quote:

If their was an option like this it would be great

There IS one... did you read the manpage?? this is exactly what i do in my acidrip program to source info from non-dvd sources. just use "-identify -frames 0" to show verbose info about the file and continue to play the grand total of 0 frames from it, then quit.

I read it, that man page is a monster. Thanks for the help :-)

this leads me to an other question. Is there an app that will allow you to search through man pages by keyword? (I have not googled for this answer yet)

i have tryed

Code:

man somthing > file

then used different tools to search throuhg the file, but this dos not do a real good job.

wow that works beautifully, I do not even really have to do much to parse the info out :-)

an app? How about man? the less pager in it responds to basic vi commands. load the manpage and try typing "/identify". press n to cycle through results. To be honest i've been using linux daily for about 5 years now. I only found this out about 6 months ago!

I have a linux system(freevo) connected to my tv. I like to crop some of the wider screen movies to fill more of my tv screen. This little script will make an mplayer.conf file for individual movies, or whole directorys. Maybe someone may find it useful

Code:

#!/usr/bin/env python

#

# cropit-0.2

#

# author shane lindberg

#

import os, sys, getopt, commands





# this function gets the command options

def get_opts(argv):

                          

    crop = '81'    

    try:    

        opts, args = getopt.getopt(argv, "hc:", ["help", "crop="])

    except getopt.GetoptError:

        usage()                         

        sys.exit(2) 

    

    for opt, arg in opts:

        if opt in ("-h", "--help"):

            usage()

            sys.exit()

        elif opt in ("-c", "--crop"):

            crop = arg

    

    return (crop, args)





# this function gives a usage(help) message. This is either called be the user makeing an invalid

# option choice, or by choosing the -h or --help option

def usage():



    print """\n

Usage: cropit [OPTION]... [FILE]...



Options available to cropit



-h, --help         shows options available to cropit .



-c, --crop         tells how much to crop the width of you avi file. The number 

                   given is a percentage of the original, ex. -c 85 will crop

                   the width to 85% of the original. -c 100 will crop it to 

                   100% of the original, which means no crop. The smaller the

                   number the larger the crop. The default crop is -c 81, or 

                   81%. A typical range of 75 to 90 is prefered for most files.\n\n\n """





# this python function gets the dimensions of a video file and returns them as a tuple (width,height)

def getdimensions(v_video_file):



    avitype_command= '/usr/bin/mplayer -identify -frames 0 "%s"' % v_video_file

    output = commands.getoutput(avitype_command)

    split = output.splitlines()

    for i in split:

        if i.startswith('ID_VIDEO_WIDTH='):

            width = int(i.replace('ID_VIDEO_WIDTH=',''))

        if i.startswith('ID_VIDEO_HEIGHT='):

            height = int(i.replace('ID_VIDEO_HEIGHT=',''))   

    return (width, height)



# this function makes the movie.avi.conf file

def make_conf(v_video_file, v_dimensions, v_user_crop):



    base_dir = os.getcwd()

    conf_name = "%s/%s.conf" % (base_dir, v_video_file)

    width = v_dimensions[0]

    height = v_dimensions[1]

    cropped_width = int(float(v_user_crop)/100*width)    

    conf_file = open(conf_name, "w")

    conf_file.write("vf=crop=%s:%s\n" %(cropped_width, height))

    conf_file.close()





def main():

    

    options = get_opts(sys.argv[1:])

    

    for i in options[1]:

        dimensions = getdimensions(i)

        make_conf(i, dimensions, options[0])



main()

I made a couple of changes to the original. There was a bug I never noticed before. If you used the absolute path instead of the relative path, it would error out, which in now fixed. Before you were unable to run the program remotely using ssh. I think that was because the program depends on mplayer, since I do not have x11 forwarding it would freeze up at the mplayer command. I changed the video output to this, it seemed to solve the problem

Code:

mplayer -vo null

here is the revised version

Code:

#!/usr/bin/env python

#

# cropit-0.2.1

#

# author shane lindberg

#

import os, sys, getopt, commands





# this function gets the command options

def get_opts(argv):



    crop = '81'

    try:

        opts, args = getopt.getopt(argv, "hc:", ["help", "crop="])

    except getopt.GetoptError:

        usage()

        sys.exit(2)



    for opt, arg in opts:

        if opt in ("-h", "--help"):

            usage()

            sys.exit()

        elif opt in ("-c", "--crop"):

            crop = arg



    return (crop, args)





# this function gives a usage(help) message. This is either called be the user makeing an invalid

# option choice, or by choosing the -h or --help option

def usage():



    print """\n

Usage: cropit [OPTION]... [FILE]...



Options available to cropit



-h, --help         shows options available to cropit .



-c, --crop         tells how much to crop the width of you avi file. The number

                   given is a percentage of the original, ex. -c 85 will crop

                   the width to 85% of the original. -c 100 will crop it to

                   100% of the original, which means no crop. The smaller the

                   number the larger the crop. The default crop is -c 81, or

                   81%. A typical range of 75 to 90 is prefered for most files.\n\n\n """





# this python function gets the dimensions of a video file and returns them as a tuple (width,height)

def getdimensions(v_video_file):



    avitype_command= '/usr/bin/mplayer -vo null -identify -frames 0 "%s"' % v_video_file

    output = commands.getoutput(avitype_command)

    split = output.splitlines()

    for i in split:

        if i.startswith('ID_VIDEO_WIDTH='):

            width = int(i.replace('ID_VIDEO_WIDTH=',''))

        if i.startswith('ID_VIDEO_HEIGHT='):

            height = int(i.replace('ID_VIDEO_HEIGHT=',''))

    return (width, height)



# this function makes the movie.avi.conf file

def make_conf(v_video_file, v_dimensions, v_user_crop):



    conf_name = "%s.conf" % (v_video_file)

    width = v_dimensions[0]

    height = v_dimensions[1]

    cropped_width = int(float(v_user_crop)/100*width)

    conf_file = open(conf_name, "w")

    conf_file.write("vf=crop=%s:%s\n" %(cropped_width, height))

    conf_file.close()

    print os.path.abspath(conf_name)



def main():



    options = get_opts(sys.argv[1:])



    for i in options[1]:

        if i.endswith('.avi') or i.endswith('.mp4'):

            dimensions = getdimensions(i)

            make_conf(i, dimensions, options[0])



main()