I'm a beginner on Cinelerra, though I have camcorded video during 15
years, mostly Hi8 and now HDV the latest year. I also made a few analog
LE small scale project for my own purpose. Now I've started to prepare
myself on using Cinelerra by reading documentation, and unavoidable some
questions arise.
Trying to apply the Cinelerra Tutorial - Getting Started by Rob Fisher,
the section "Setting Project Options" uses Quicktime (.mov) format. I
will however work with the following three recorded types of PAL video
formats, in different projects in order as follows:
1) DV (converted from Hi8 S-Video)
2) DV Wide (down converted from HDV 1080i in camcorder)
3) HDV 1080i (later)
Here I use the "idvid" tool (part of tovid) to identify my three types
of test files, which then output the following (extracted) output:
1) idvid dv03.dv
File: dv03.dv
Width: 720 pixels
Hight: 576 pixels
Aspect ratio: 1.33:1
Frames: 896
Duration: 00:00:35 hours/mins/secs
Framerate: 25.000 frames per second
Video format: dvsd
Video bitrate: 28800000 bits per second
2) idvid dv02.dv
File: dv02.dv
Width: 720 pixels
Height: 576 pixels
Aspect ratio: 1.77:1
Frames: 14912
Duration: 00:09:56 hours/mins/secs
Framerate: 25.000 frames per second
Video format: dvsd
Video bitrate: 28800000 bits per second
3) idvid hdv01_01.m2t
File: hdv01_01.m2t
Width: 1440 pixels
Height: 1080 pixels
Aspect ratio: 1.77:1
Frames: 175
Duration: 00:00:07 hours/mins/secs
Framerate: 25.000 frames per second
Video format: MPEG2
Video bitrate: 25000000 bits per second
I have some questions regarding useful Cinelerra configuration:
According to the above idvid output, I will expect Cinelerra's Program
window menu Setting>Format should be set as follows:
Frame rate: 25.000
Width: 720 (1440 for HDV)
Height:576 (1080 for HDV)
W Ratio: 1.000 ?
H Ratio: 1.000 ?
Color model: RGBA-8bit ?
Aspect Ratio: 4 : 3 (= 1.33:1 for DV)
16 : 9 (= 1.77:1 for DV Wide and HDV)?
Interlace mode: Bottom field first?
Are the above settings correct, or should something be changed and
possibly why?
What are really "W Ratio" and "H Ratio" vs "Aspect Ratio"?
What about color model to select, RGBA vs i.e YUVA or other?
The pixel number ratio Width/Height=720/576=1.25 for DV and DV Wide, and
1440/1080=1.33 for HDV
The rectangulary pixel Width/Height ratio calculated from the Aspect
ratios should then be
1.33/1.25=1.064 for DV
1.77/1.25=1.416 for DV Wide
1.77/1.33=1.330 for HDV
So to the Program window "Resize track" as mentioned in the same Tutorial:
Size: 720 x 576 (for DV and DV Wide)?
1920 x 1080 (for HDV as 1440x1080 is lacking)?
Scale: 1.000 x 1.000 (for all)?
Can someone explain what the scale here really does and if it should be
changed of some reason?
At last I wonder, is there some of this or other related configurations
that preferably should be set in Preferences?
-------------------
Terje J. Hanssen
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