[FFmpeg-user] Convert 720 50p > 576 50i PAL SD (resent)

Mark Himsley mark.himsley at gmail.com
Thu Mar 21 21:29:11 CET 2013


On 20 Mar 2013 03:12, "David McSween" <3pointedit at gmail.com> wrote:
>
> Hi, I’m an ffmpeg noob using AnotherGUi frontend. I want to convert my,
>
> h264 720 50p video (Canon DSLR QT)
>
> to
>
> DVCpro 25 50i SD.
>
>
>
> So I need to interlace the 50 frames into fields, and re-sync the audio to
> 25fps.
>
>
>
> Also I wonder if there are any useful filters to reduce twitter on fields
> after/before conversion?

The tintelace filter includes a vertical low pass filter for exactly this.
I'm sure its in the man page.

> PS. Anyone know what the shutter angle should be used for shooting 50i? I
> am guessing I should originate 360deg at 50fps so that it becomes a pseudo
> 180deg at 25fps.

No idea.


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