Commands by ivalladt

Commands by ivalladt (13)

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Concatenate video files to YouTube ready output

Takes two input video files and an external audio track and encodes them together to an MPEG-4 DivX output video file with the correct size ready for uploading.
This is sample output - yours may be different.
3

mencoder -audiofile input.mp3 -oac copy -ovc lavc -lavcopts vcodec=mpeg4 -ffourcc xvid -vf scale=320:240,harddup input1.avi input2.avi -o output.avi

ivalladt · 2010-01-28 21:14:03 0
DVD to YouTube ready watermarked MPEG-4 AVI file using mencoder (step 2)

Reencodes to MPEG-4 DivX output video file from step 1. Audio stream is simply copied. Resizes to 320x240 and deinterlaces as needed. A heading subtitle file is applied as watermark. This heading subtitle file can be a URL.
This is sample output - yours may be different.
3

mencoder -sub heading.ssa -subpos 0 -subfont-text-scale 4 -utf8 -oac copy -ovc lavc -lavcopts vcodec=mpeg4 -vf scale=320:-2,expand=:240:::1 -ffourcc xvid -o output.avi dvd.avi

ivalladt · 2009-11-23 11:58:42 0
DVD to YouTube ready watermarked MPEG-4 AVI file using mencoder (step 1)

Rips DVD to lossless encoded video file. Reencodes audio to CBR MP3 for correct audio to video syncing. Be sure to have enough free disk space.
This is sample output - yours may be different.
0

mencoder -oac mp3lame -lameopts cbr=128 -ovc lavc -lavcopts vcodec=mjpeg -o dvd.avi dvd://0

ivalladt · 2009-11-23 11:53:30 0
Rip DVD to YouTube ready MPEG-4 AVI file using mencoder

Rip DVD to YouTube ready AVI file, using MPEG-4 video codec and MP3 audio codec. Resizes to 320x240 and deinterlaces as needed.
This is sample output - yours may be different.
4

mencoder -oac mp3lame -lameopts cbr=128 -ovc lavc -lavcopts vcodec=mpeg4 -ffourcc xvid -vf scale=320:-2,expand=:240:::1 -o output.avi dvd://0

ivalladt · 2009-09-25 19:29:25 0
Use heading subtitle file as watermark using mencoder

Create subtitle file heading.ssa with just one entry for the entire video duration. Command line sets that entry's text on top of the video as text watermark. If text is an URL works nice for sending people back to your site from a YouTube clip. Output file is lossless encoded and suitable for further processing. Subtitle file can be a URL so it's saved remotely.
This is sample output - yours may be different.
0

mencoder -sub heading.ssa -subpos 0 -subfont-text-scale 4 -utf8 -oac mp3lame -lameopts cbr=128 -ovc lavc -lavcopts vcodec=mjpeg -vf scale=320:-2,expand=:240:::1 -o output.avi input.flv

ivalladt · 2009-09-21 11:56:55 0
Record MP3 audio via ALSA using ffmpeg

Record audio to an MP3 file via ALSA. Adjust -i argument according to arecord -l output.
This is sample output - yours may be different.
4

ffmpeg -f alsa -ac 2 -i hw:1,0 -acodec libmp3lame -ab 96k output.mp3

ivalladt · 2009-09-16 12:45:44 0
Record audio and video from webcam using mencoder

Record audio to MP3 stream and video to MPEG-4 stream from webcam to AVI file using mencoder. Gives floating point exception in some mencoder versions.
This is sample output - yours may be different.
6

mencoder tv:// -tv driver=v4l2:width=800:height=600:device=/dev/video0:fps=30:outfmt=yuy2:forceaudio:alsa:adevice=hw.2,0 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800 -ffourcc xvid -oac mp3lame -lameopts cbr=128 -o output.avi

ivalladt · 2009-09-15 19:46:06 0
View webcam output using mplayer

View webcam output using mplayer, with correct fps and outfmt settings according to my webcam model.
This is sample output - yours may be different.
5

mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0:fps=30:outfmt=yuy2

ivalladt · 2009-09-15 19:41:41 0
Record audio and video from webcam using ffmpeg

Record from a webcam, audio using ALSA encoded as MP3, video as MPEG-4.
This is sample output - yours may be different.
5

ffmpeg -f alsa -r 16000 -i hw:2,0 -f video4linux2 -s 800x600 -i /dev/video0 -r 30 -f avi -vcodec mpeg4 -vtag xvid -sameq -acodec libmp3lame -ab 96k output.avi

ivalladt · 2009-09-15 17:03:25 0
Extract audio track from a video file using mencoder

Extracts an MP3 encoded audio stream from an input video file.
This is sample output - yours may be different.
3

mencoder -of rawaudio -ovc copy -oac mp3lame -o output.mp3 input.avi

ivalladt · 2009-09-15 11:28:01 0
Substitute audio track of video file using mencoder

Creates a new video file with video stream copied from input file and a different audio stream
This is sample output - yours may be different.
2

mencoder -ovc copy -audiofile input.mp3 -oac copy input.avi -o output.avi

ivalladt · 2009-09-15 11:26:05 0
Remove sound from video file using mencoder

Remove sound from input video file, output video stream is copied from input video stream, with no audio.
This is sample output - yours may be different.
1

mencoder -ovc copy -nosound input.avi -o output.avi

ivalladt · 2009-09-15 11:22:51 0
FLV to AVI with subtitles and forcing audio sync using mencoder

Gives MPEG-4/DivX output video file ready for uploading to YouTube from FLV file downloaded from the site and your own subtitle file UTF-8 encoded. No resizing needed. (?)
This is sample output - yours may be different.
1

mencoder -sub subs.ssa -utf8 -subfont-text-scale 4 -oac mp3lame -lameopts cbr=128 -ovc lavc -lavcopts vcodec=mpeg4 -ffourcc xvid -o output.avi input.flv

ivalladt · 2009-09-12 09:24:24 0

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Doing some floating point calculations with rounding (e.g. at the 3rd decimal)

Setup a persistant SSH tunnel w/ pre-shared key authentication

This creates a persistent ssh -i /path/to/key -ND local-IP:PORT User@Server connection. You may have to install autossh. -f puts in daemon mode. if you are having trouble, try it without -f.

Rip a CD/DVD to ISO format.

An easy method to generate ISOs from CD/DVD media.

Backup with versioning

Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

See multiple progress bars at once for multiple pipes with pv

In this example we convert a .tar.bz2 file to a .tar.gz file. If you don't have Pipe Viewer, you'll have to download it via apt-get install pv, etc.

Backup your LDAP

Simple way to backup your LDAP entries: put this line on your crontab. The -n switch identifies the dbnum you want to backup (alternatively you can use -b suffix. Check man slapcat for your personal switches)

Summarise the size of all files matching a simple regex

Use the find command to match certain files and summarise their total size in KBytes.

Bash function that saves bash functions to file from shell session

The simpler, 1-arg version is save_function(){ { date +"# %F.%T $1; declare -f "$1";}| tee -a ~/.bash_functions; }`

Remove a range of lines from a file

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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