Use awk and sed to extract height and width of file

toben · 08-03-2010, 05:43 PM

Hello I am trying to write commands that extracts the height and width of a video file via ffmpeg. I have the following working so far:

ffmpeg -i videofile.mov 2>&1 |grep Video|awk '{print $6}'

This gives the following answer in widthxheight format with an extra ,
720x480,

How can I instead run 2 separate commands that give me height and width separately? I want some command to give me 720 and another command to give me 480 and I dont need the x or the ,

Any suggestions?

If you need to know this is what ffmpeg -i videofile.mov 2>&1 gives as output

ffmpeg -i videofile.mov 2>&1

FFmpeg version SVN-r23940, Copyright (c) 2000-2010 the FFmpeg developers
built on Jul 1 2010 19:57:32 with gcc 4.4.3
configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-pthreads --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
libavutil 50.19. 1 / 50.19. 1
libavcodec 52.78. 1 / 52.78. 1
libavformat 52.71. 0 / 52.71. 0
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 1.20. 1 / 1.20. 1
libswscale 0.11. 0 / 0.11. 0
libpostproc 51. 2. 0 / 51. 2. 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1b7f470] max_analyze_duration reached

Seems stream 0 codec frame rate differs from container frame rate: 5994.00 (5994/1) -> 29.97 (2997/100)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mydc3756.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
Duration: 00:28:30.14, start: 0.000000, bitrate: 2397 kb/s
Stream #0.0(eng): Video: h264, yuv420p, 720x480, 1985 kb/s, PAR 10000:11250 DAR 4:3, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc
Stream #0.1(eng): Audio: adpcm_ima_qt, 48000 Hz, 2 channels, s16
Stream #0.2(eng): Data: tmcd / 0x64636D74
At least one output file must be specified

sycamorex · 08-03-2010, 06:39 PM

One, not very elegant, way of doing it would be:

Code:

ffmpeg -i marcus.avi 2>&1 | awk '/Video/ {print $6}' | awk -Fx '{print $1}'

Code:

ffmpeg -i marcus.avi 2>&1 | awk '/Video/ {print $6}' | awk -Fx '{print $2}'

rigor · 08-03-2010, 06:49 PM

Using your output file, I was able to get what, I thought you said you wanted, by doing as follows.

The command sequence:

Code:

ffmpeg -i videofile.mov 2>&1 |grep Video|awk '{ split( $6, pieces,  /[x,]/ ) ; print pieces[1] }'

outputs:

720

The command sequence:

Code:

ffmpeg -i videofile.mov 2>&1 |grep Video|awk '{ split( $6, pieces,  /[x,]/ ) ; print pieces[2] }'

outputs:

480

syg00 · 08-03-2010, 07:04 PM

Perhaps combine the two responses - no need for that grep.

ghostdog74 · 08-03-2010, 08:47 PM

with bash 3.2+

Code:

var=$(ffmpeg -i videofile.mov 2>&1)
[[ $var =~ ".*([0-9]{3})x([0-9]{3}).*" ]]
echo ${BASH_REMATCH[1]}
echo ${BASH_REMATCH[2]}

grail · 08-04-2010, 05:06 AM

How about:

Code:

var=($(ffmpeg -i  videofile.mov 2>&1 | awk '/Video/{print gensub(/.* ([0-9]+)x([0-9]+) .*/,"\\1\n\\2","g")}'))

echo ${var[0]}
echo ${var[1]}

colucix · 08-04-2010, 06:16 AM

Just an alternative if mplayer is an option:

Code:

var=($(mplayer -identify -frames 0 videofile.mov 2>&1 | awk -F= '/WIDTH|HEIGHT/{print $2}'))
echo ${var[0]}
echo ${var[1]}

or in two different variables

Code:

wdt=$(mplayer -identify -frames 0 videofile.mov 2>&1 | awk -F= '/WIDTH/{print $2}')
hgt=$(mplayer -identify -frames 0 videofile.mov 2>&1 | awk -F= '/HEIGHT/{print $2}')

I was looking at this because the option -i of ffmpeg has another meaning on my system.