On Mon, Jan 12, 2015 at 3:42 PM, Carl Karsten <c...@personnelware.com>
wrote:
> I am hoping there is a setting I can use to override the aspect ratio set
> in dv frames.
>
> I have .dv files that are a mix of 4:3 frames and 16:9. they should all
> be 16:9. (it is a result of sending 16:9 vga in to a scan converter that
> spit out 4:3 dv.) I don't need black bars or any sort of transformation,
> just change the aspect ratio byte on the dv frame.
>
> when I encode, melt seems to use the first frame. I could add a single
> dv frame to the start of each file, that would likely work. I am hoping I
> can just add a parameter to my .mlt xml or melt command line.
>
> Any suggestions?
>
>
Hi Carl,
Yes, you can supply force_aspect_ratio to the producer, but there are 2
caveats:
1.) It does not instruct the auto-profile mechanism - use an explicit
profile.
2.) It is sample, not picture aspect - see a profile for details.
For example,
melt -query profile=dv_ntsc_wide
---
description: DV/DVD Widescreen NTSC
frame_rate_num: 30000
frame_rate_den: 1001
width: 720
height: 480
progressive: 0
sample_aspect_num: 32
sample_aspect_den: 27
display_aspect_num: 16
display_aspect_den: 9
colorspace: 601
...
melt -profile dv_ntsc_wide some.dv force_aspect_ratio=@32/27
(The @ sign makes the MLT properties system interpret the value as a simple
math expression.)
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