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Update HowtoVideoCodecs.md

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## Video files
A video file consists out of TWO seperate elements:
* container
* codec
### A video file consists out of TWO seperate elements
* container
* codec
The container holds the digitally encoded data and the codec is capable of decoding/encoding this digitally encoded data.
Veejay supports the AVI and the Quicktime container , with the following codecs:
Veejay supports the AVI and the Quicktime container, with the following codecs:
Quicktime:
### Quicktime
* mpjeg,mjpa,jpeg,dmb1,mpng,png
* dvsd, dv, dvcp, dvhd
* mpjeg,mjpa,jpeg,dmb1,mpng,png
* dvsd, dv, dvcp, dvhd
### AVI
* mjpeg, mjpa,jpeg,jfif,dmb1,mpng,png
* dvsd, dv, dvcp, dvhd
* i420, i422, yv16, hfyu
AVI
### Raw DV
* PAL / NTSC dvsd
* mjpeg, mjpa,jpeg,jfif,dmb1,mpng,png
* dvsd, dv, dvcp, dvhd
* i420, i422, yv16, hfyu
Veejay **can only deal** with video files that consists entirely out of whole images, **only I-frames**.
Raw DV
* PAL / NTSC dvsd
Veejay can only deal with video files that consists entirely out of whole images (only I-frames).
Which codec to use ¶
## Which codec to use
MotionJPEG (mjpeg) is the veejay codec of choice for most applications, it gives you a good tradeof between compression, quality and compatibility. If you want speed, use AVI yv16 or i420 while recording to new samples.
Tools that support MJPEG:
* http://cvs.cinelerra.org/Cinelerra
* http://www.kinodv.org/Kino
* http://ronald.bitfreak.net/lvs/Linux video studio
* http://mjpeg.sourceforge.net/mjpegtools
* http://www.mplayerhq.huMplayer, and mencoder
* http://lives.sf.net Lives
Wich resolutions to use ¶
### Tools that support MJPEG:
* http://cvs.cinelerra.org/Cinelerra
* http://www.kinodv.org/Kino
* http://ronald.bitfreak.net/lvs/Linux video studio
* http://mjpeg.sourceforge.net/mjpegtools
* http://www.mplayerhq.huMplayer, and mencoder
* http://lives.sf.net Lives
## Wich resolutions to use
Veejay can do:
* high definition
* pal: 720x576
* ntsc: 720x480
* 1/4 pal: 360x288
* 1/4 ntsc: 360x240
* high definition
* pal: 720x576
* ntsc: 720x480
* 1/4 pal: 360x288
* 1/4 ntsc: 360x240
If you load multiple video files on the commandline, make sure that all files have the same resolution and audio properties.
How to convert
## How to convert
### You can use FFMpeg
You can use FFMpeg:
$ ffmpeg -i input-file -vcodec mjpeg -pix_fmt yuvj422p -q:v 0 output-file.avi
̀`$ ffmpeg -i input-file -vcodec mjpeg -pix_fmt yuvj422p -q:v 0 output-file.avi`
Optionally add PCM 16bit audio, 44.1/48.0 Khz, 2 channels, 8 bits per channel
ffmpeg -i input-file -vcodec mjpeg -s 128x128 -pix_fmt yuvj422p -acodec pcm_s16le -ar 44100 -ac 2 output-file.avi
`$ ffmpeg -i input-file -vcodec mjpeg -s 128x128 -pix_fmt yuvj422p -acodec pcm_s16le -ar 44100 -ac 2 output-file.avi`
Or, you can use mplayer:
### Or, you can use mplayer
`$ mencoder -ovc lavc -oac pcm -lavcopts vcodec=mjpeg -o <outputfile> <inputfile>`
$ mencoder -ovc lavc -oac pcm -lavcopts vcodec=mjpeg -o <outputfile> <inputfile>
To scale on the fly, use:
$ mencoder -ovc lavc -oac pcm -lavcopts vcodec=mjpeg -vf scale=352:288 -o <outputfile> <inputfile>
### To scale on the fly, use
`$ mencoder -ovc lavc -oac pcm -lavcopts vcodec=mjpeg -vf scale=352:288 -o <outputfile> <inputfile>`
consult mplayer documentation about other options, such as cropping and filtering out blocks in video.
a quick hint for bulk encoding a bunch of capture.dv files:
$ for i in `ls *dv`;do mencoder -ovc lavc -oac pcm -lavcopts vcodec=mjpeg -o `echo $i | sed s/.dv/.avi/` $i; done;
What is this dummy mode ¶
### a quick hint for bulk encoding a bunch of capture.dv files
`$ for i in `ls *dv`;do mencoder -ovc lavc -oac pcm -lavcopts vcodec=mjpeg -o `echo $i | sed s/.dv/.avi/` $i; done;`
## What is this dummy mode
Dummy mode opens up a 'color stream' to start veejay without a video file.
If you use a video file, veejay will take that file's properties as default settings for the whole session.