This happens because you have not specified a profile - so MLT makes up a
profile based on your first producer.
https://www.mltframework.org/docs/profiles/
An easy way to learn about profiles is to create a project with a tool like
Kdenlive or Shotcut and then inspect the output.
On Friday, October 9, 2020, 01:24:38 AM CDT, amindfv--- via Mlt-devel
<mlt-devel@lists.sourceforge.net> wrote:
Anyone have a solution for this? I keep running into this issue and I'm hoping
it's a very small fix.
On Sat, Sep 26, 2020 at 07:16:55PM -0400, amin...@mailbox.org wrote:
> Given a project whose producers have different aspect ratios...
>
> <mlt>
> <producer id="wide">
> <property name="resource">wide.mp4</property>
> </producer>
> <producer id="narrow">
> <property name="resource">narrow.mp4</property>
> </producer>
> <playlist>
> <entry producer="wide" in="0" out="72"/>
> <entry producer="narrow" in="0" out="72"/>
> </playlist>
> </mlt>
>
> ...and using the avformat consumer...
>
> melt foo.mlt -consumer avformat:foo.mp4
>
> ...the width and height of the output video seem to often (not always! -
> curious about this) be the w/h of the first producer in the playlist. The
> other producers are scaled to fit the output width or height while preserving
> their aspect ratios.
>
> But when I fix the output width and height, all the producers are stretched
> to fit, not preserving their original aspect ratios:
>
> melt foo.mlt -consumer avformat:foo.mp4 width=1920 height=1080
>
> How can I specify output width and height while preserving the producers'
> aspect ratios?
>
> Thanks!
> Tom
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