2.4 KiB
Video files
A video file consist out of two SEPARATE 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:
Quicktime
- 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
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
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 Veejay can do:
- 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
### You can use FFMpeg
̀$ 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
Or, you can use mplayer
$ 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>
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 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.