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Useful commands for multimedia and graphics using CLI

hi all,

I want to start a thread of commands related to multimedia and graphics such as playing, viewing, editing, encoding and such preferably from the command line. Hopefully, our commands can be useful to others and me.

Rip a DVD title

Code:

HandBrakeCLI -i /media/MOVIE_TITLE/VIDEO_TS/ -t <num> -o movie-name.mp4

Encode a portion of a video. This will start encoding 5 minutes from the video and encode 3 minutes of it.

Code:

HandBrakeCLI -i input_file --start-at duration:300 --stop-at duration:180 -o out.mp4

Other useful options are --gain <num>db to increase volume and -s <num> to toggle subtitles (IF available from source) into the video.

So, if you have any favorites using mplayer/mencoder, ffmpeg/avconv, sox, convert, HandBrakeCLI or whatever, let us know.

Here is a command that I used early on for my podcast for encoding videos using mencoder.

mencoder [options] file1 [specific options] [file2] [specific options]

This takes a file named 'out.ogv' created with gtk-recordmydesktop, and re-encodes it as 'out.avi' adds a title, artist, genre, copyright and comment.

Code:

mencoder out.ogv -oac mp3lame -ovc lavc -ofps 30 -vf scale=1024:768 -o out.avi -info name="Going Linux Screencast #001":artist="Larry Bushey and Tom Chaudoir":genre="screencast":subject="Using Audacity to Record a Podcast":copyright="Creative Commons License Attribution 3.0":comment="screencasts.goinglinux.com"

Reference:
http://ubuntuforums.org/showthread.php?t=806125

For graphics, ImageMagic is awesome.
http://www.imagemagick.org/script/index.php

I use this to record my screen in Ubuntu 13.04 with audio from my Logitech webcam:

Code:

ffmpeg -f alsa -i plughw:CARD=U0x46d0x809,DEV=0  -acodec flac -f x11grab -r 30 -s 1214x776 -i :0.0 -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 -sameq capture.avi

Use your own device nodes, and file names.

Dump audio from video into .mp3 format

Code:

ffmpeg -i file.avi -vn -c:a libmp3lame -b:a 128k Output.mp3

Capture sound card (may require virtual loopback device) See footnote

Code:

ffmpeg -f alsa -i hw:1,1 -c:a copy -vn out.wav

Capture desktop with sound

Code:

ffmpeg -f alsa -i hw:1,1 -f x11grab -r 24 -s 320x240 -i :0.0 -c:a libmp3lame -b:a 32k -c:v libx264 -b:v 500k output.avi

Capture Mic

Code:

arecord -vv -fdat out.wav

Code:

ffmpeg -f alsa -i hw:0,0 -c:a copy -vn out.wav

Select audio stream from multi audio stream video, like a DVD.

Code:

ffmpeg -i file.vob -map 0:0 -map 0:2 ...Out.avi

Sync problems

Code:

ffmpeg -i file.vob -async 1 -vsync 0-3...

Change audio volume (128 = 100%, 256 = 200%) etc.

Code:

ffmpeg -i file.vob -vol 256...

Watermark a video
Top left corner

Code:

ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=10:10 [out]" outputvideo.flv

Top right corner

Code:

ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" outputvideo.flv

Bottom left corner

Code:

ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" outputvideo.flv

Bottom right corner

Code:

ffmpeg –i inputvideo.avi -vf "movie=watermarklogo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" outputvideo.flv

Join 2 media files

Code:

ffmpeg -i "concat:/path/to/file1.mp3|/path/to/file2.mp3" -c:a copy -vn Output.mp3

Copy Timestamps in - out

Code:

ffmpeg -i file.vob -copyts -vsync 2....

ffplay brightness contrast -vf mp=eq2=gam:con:bri:sat

Code:

ffplay -vf mp=eq2=1.0:1.0:0.1:1.0 file.avi

Change audio speed (from 50% to 200% in ffmpeg)

Code:

ffmpeg -i input.mp3 -filter:a "atempo=1.5" -vn ...output.mp3

Code:

sox file.mp3 fixed.mp3 speed 1.2

Change video speed +25% with increased framerate +25%

Code:

ffmpeg -i input.flv -r 40 -filter:v 'setpts=0.750*PTS' -an .....output.flv

Grab your web cam

Code:

ffmpeg -f v4l2 -s 200x150 -i /dev/video0 -c:v libx264 -b:v 300k out.avi

PES package size mismatch from video's with aac audio

Code:

ffmpeg -i vid.ts -bsf:a aac_adtstoasc -c:a copy .....out.avi

Make animated gif from vid

Code:

mplayer file.flv -ss 00:05 -endpos 6 -vo gif89a:fps=5:output=output.gif -vf scale=400:300 -nosound

Keep pitch change tempo

Code:

mplayer file.mp3 -af scaletempo -speed 1.5

Keep tempo change pitch (Change pitch with [] keys)

Code:

mplayer file.mp3 -af scaletempo=scale=1.0:speed=pitch

TV DVB (H and K to change channels)

Code:

mplayer dvb://

Capture TV channel

Code:

mplayer dvb://WNBC -dumpstream -dumpfile out.ts

Code:

azap -r -c ~/.mplayer/channels.conf WNBC

then

Code:

cat /dev/dvb/adapter0/dvr0 > out.ts

Audio only from video

Code:

mencoder file.flv -ovc copy -oac copy -of rawaudio -o test.mp3

Audio only from audio

Code:

mencoder -audiofile /path/to/input.wav -demuxer rawvideo -rawvideo w=1:h=1 /path/to/input.wav -ovc copy -oac mp3lame -lameopts cbr:br=192 -of rawaudio -o output.mp3

That's enough for now, post if you want to know more.

footnote
Create or modify ~/.asoundrc with

Code:

pcm.!default {

  type asym

  playback.pcm "LoopAndReal"

  #capture.pcm "looprec"

  capture.pcm "hw:0,0"

}



pcm.looprec {

    type hw

    card "Loopback"

    device 1

    subdevice 0

}





pcm.LoopAndReal {

  type plug

  slave.pcm mdev

  route_policy "duplicate"

}





pcm.mdev {

  type multi

  slaves.a.pcm pcm.MixReale

  slaves.a.channels 2

  slaves.b.pcm pcm.MixLoopback

  slaves.b.channels 2

  bindings.0.slave a

  bindings.0.channel 0

  bindings.1.slave a

  bindings.1.channel 1

  bindings.2.slave b

  bindings.2.channel 0

  bindings.3.slave b

  bindings.3.channel 1

}





pcm.MixReale {

  type dmix

  ipc_key 1024

  slave {

    pcm "hw:0,0"

    rate 48000

    #rate 44100

    periods 128

    period_time 0

    period_size 1024 # must be power of 2

    buffer_size 8192

  }

}



pcm.MixLoopback {

  type dmix

  ipc_key 1025

  slave {

    pcm "hw:Loopback,0,0"

    rate 48000

    #rate 44100

    periods 128

    period_time 0

    period_size 1024 # must be power of 2

    buffer_size 8192

  }

}

Then

Code:

modprobe snd-aloop

I have a tip for scaling videos higher or lower i.e resizing.

Ffmpeg

For ffmpeg, the -s is still compatible with ffmpeg. However, for example, you can also use -vf scale=640:480 to resize the video. Yes, it's more typing but the neat tip is below.

Have you ever wanted to resize a video to an unusual resolution and you don't want to guess the values, give -vf scale a starting number and it will fill the rest, thus keeping proper aspect ratio of the encoded video.

In this example, 500 is the starting value of the resolution I want, the -1 will fill the second value for me. And the video will be in proper aspect ratio.

-vf scale=500:-1

As the video is being encoding, it will show the values it chosen.

**Note: Don't use -vf scale on live screen captures especially when capturing the full screen of your desktop. You can, however, use -vf scale after doing the screen capture to resize the video higher or lower.

Mencoder

mencoder uses the same -vf scale option as well. The only difference is it uses a -2

-vf scale=500:-2

Happy encoding.