Is it possible to change the pixel aspect without re-encoding?

[stib]

The PAR is just set in the metadata isn't it? So it should be easy to change without a re-encode?

There's something on the Wiki in the release notes for an older version, but it seems to relate to MPEG2 only, and there's no instructions.

thanks
-stib

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Sent from /dev/tty0

[Baptiste Coudurier]

On 04/26/2012 07:20 AM, stib wrote:
> The PAR is just set in the metadata isn't it? So it should be easy to
> change without a re-encode?
>
> There's something on the Wiki in the release notes for an older version,
> but it seems to relate to MPEG2 only, and there's no instructions.

You can change mpeg-2 aspect ratio with a bitstream filter:
-vbsf mpeg2setdar <aspect>

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Baptiste COUDURIER
Key fingerprint 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
FFmpeg maintainer http://www.ffmpeg.org

[stib]

Thanks.

Any chance of it being implemented for other containers, or is it impossible? Otherwise does anyone know of good command line tools for this sort of thing?

-stib

[Baptiste Coudurier]

On 04/26/2012 09:07 AM, stib wrote:
> Thanks.
>
> Any chance of it being implemented for other containers, or is it
> impossible? Otherwise does anyone know of good command line tools for this
> sort of thing?

Depends on the container, but this filters work on mpeg2 video essence,
not container.
If you want a feature like this, contact me for a quote :)