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84 lines
2.5 KiB
Plaintext
84 lines
2.5 KiB
Plaintext
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Video files ¶
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A video file consists out of TWO seperate 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
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* dvsd, dv, dvcp, dvhd
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AVI
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* mjpeg, mjpa,jpeg,jfif,dmb1
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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). The codecs below will only work if all frames are I-frames. Otherwise, veejay will abort with an error message.
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AVI / Quicktime:
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* xvid, mp4v,divx,dxsd,mp4s,m4s2
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* div3,mp43,mp42,mpg4
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* avc1,h264,x264,davc,svq1,svq3,avc1
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Wich 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 (use MLZO/YUV avi)
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* pal: 720x576 (recommended to use MLZO/YUV avi)
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* ntsc: 720x480
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* 1/4 pal: 360x288 (any)
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* 1/4 ntsc: 360x240 (any)
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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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Veejay can convert dv video to mjpeg for you, however, I prefer to use mplayer for this, wich has more flexibility.
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From "anything" mplayer can play to mjpeg, use:
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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 this 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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