Command cookboook

Making PDF from manual

Handy for the big Mplayer manual

man -t mplayer | ps2pdf - > mplayer.pdf

Source(s): Command cookboook

Make a playlist using find

find . -iname "*.mp3" > playlist.txt

Source(s): Command cookboook

Shuffle play clips from folder

peter@laptop:~/Video$ mplayer -shuffle Video/*

Or: read a playlist using the shuffle option: peter@laptop:~/Music$ mplayer -playlist playlist.txt -shuffle

or shuffle the playlist in a shuffled playlist: with command shuf:

peter@laptop:~/Music$ shuf playlist.txt > playlist

Source(s): Command cookboook

playing small part of clip

mplayer -ss 10 -endpos 10 Antichrist.2009.DVDRIP.XviD-ZEKTORM/Antichrist.2009.DVDRIP.XviD-ZEKTORM.avi

extracting small part of clip

mencoder -ss 00:10:00 -endpos 00:00:10 Antichrist.2009.DVDRIP.XviD-ZEKTORM/Antichrist.2009.DVDRIP.XviD-ZEKTORM.avi -oac pcm -ovc lavc -lavcopts vcodec=mpeg4 -o test.avi

Glueing different files together with a whild card

mencoder *.avi -oac pcm -ovc lavc -lavcopts vcodec=mpeg4 -o testglue.avi

Scripts to extract

to extract small fragments from a long film, and then paste them together to testglue.avi, and then play the file fullscreen

#!/bin/bash

for ((i=1; i<10; i+=1))
do

mencoder -ss 00:${i}0:00 -endpos 2 Antichrist.2009.DVDRIP.XviD-ZEKTORM/Antichrist.2009.DVDRIP.XviD-ZEKTORM.avi -oac pcm -ovc lavc -lavcopts vcodec=mpeg4 -o test00$i.avi

done

mencoder test0*.avi -oac pcm -ovc lavc -lavcopts vcodec=mpeg4 -o testglue.avi

mplayer -fs testglue.avi

Or with 99 clips of 0.25 seconds

#!/bin/bash
rm test0*

for ((i=1; i<100; i+=1))
do

mencoder -ss 00:`printf "%02d" $i`:00 -endpos 0.25 Antichrist.2009.DVDRIP.XviD-ZEKTORM/Antichrist.2009.DVDRIP.XviD-ZEKTORM.avi -oac pcm -ovc lavc -lavcopts vcodec=mpeg4 -o test`printf "%04d" $i`.avi 2> /dev/null > /dev/null

done

mencoder test0*.avi -oac pcm -ovc lavc -lavcopts vcodec=mpeg4 -o testglue.avi 2> /dev/null > /dev/null

mplayer -fs testglue.avi

Making Motion-JPEG (mjpeg)

If you use the command:

ffmpeg -i my-movie.mov my-movie.mjpeg

This creates a file with each frame encoded as JPEG. However, this file may not be usable, because it doesn't have a proper container format.

Making a MJPEG AVI

You could better explicitly choose a container format, like AVI:

ffmpeg -i my-movie.mov -vcodec mjpeg -f avi my-movie.avi

or simply (ffmpeg recognizes the -f option from the extension of the output file)

ffmpeg -i my-movie.mov -vcodec mjpeg my-movie.avi

Making a MJPEG QuickTime

ffmpeg -i my-movie.mov -vcodec mjpeg -f mov my-movie.mov

or simply:

ffmpeg -i my-movie.mov -vcodec mjpeg my-movie.mov

Useful GStreamer "1-liners"

NB: gstreamer pipelines are similar to, but not actually commandline pipelines. In a gstreamer pipeline, the "pipe" character is an exclamation mark (!) and not a true pipe (|)

Look at a web cam

gst-launch-0.10 v4l2src device=/dev/video0 ! ffmpegcolorspace ! xvimagesink

doesn't work?, try v4lsrc instead of v4l2src.

gst-launch-0.10 v4l2src device=/dev/video0 ! video/x-raw-yuv,width=320,height=240 ! xvimagesink

Take a picture with your webcam:

gst-launch-0.10 v4l2src ! ffmpegcolorspace ! pngenc ! filesink location=foo.png

• GStreamer Website
• GStreamer on OLPC Wiki
• barcamp presentation with cool examples

Streaming video

in case VLC, Theorur, Streamnow, or whatever ... does not satisfy your streaming desires, here's a line that might work. No sound.

ffmpeg2theora /dev/video1 -f video4linux2 -o /dev/stdout | oggfwd experimentaltv.org 8000 password test.ogg