Re: [Mlt-devel] How to autodetect movie length in .mlt files?

[Dan D. <da...@de...>]

On Sat, Jan 1, 2011 at 12:32 PM, derrick parkhurst
<der...@gm...> wrote:
> On Sat, Jan 1, 2011 at 1:15 PM, László Monda <la...@mo...> wrote:
>> I'd like to write a script to be able to encode the raw .mov files of
>> my digicam to .mp4.  I've exported a render script done by Kdenlive.

Are you doing anything in the script with edits, effects, etc, or is
this just a straight transcode?

> Not a direct answer to your question, but this alternative command
> line approach might be useful in a script.
>
> melt in_file.mov in=0 out=200 length=200 -consumer
> avformat:out_file.mp4 f=mp4 acodec=lamemp3 ab=128k ar=44100
> vcodec=libmpeg4 b=1500k pix_fmt=yuv420p s=1280x720
>
> adapt as required.

Thanks for helping Derrick. Here are a few caveats for all readers:

1) If you are just transcoding without trimming there is no need to
specify in, out, and length properties on the input.

2) In the current releases of mlt, the above defaults to the dv_pal
profile, which is interlaced output, even after changing the size to
1280x720. In the next release (or current git), melt will
automatically builds a profile from the first input.

3) lamemp3 => libmp3lame

4) f=mp4 is redundant with a filename containing .mp4

5) pix_fmt=yuv420p is the default

> Cheers,
> Derrick
>
> --
> Derrick Parkhurst, Ph.D.
> @thirtysixthspan
> (405) 596-4697
> der...@gm...
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