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