[FFmpeg-user] Problem with vf pad ... help please

[Mark Himsley]

On 16/09/2012 23:35, Christian Ebert wrote:
> * Mark Himsley on Sunday, September 16, 2012 at 14:20:12 +0100
>> Input #0, avi, from '/home/toto/blender/dronez.avi':
>>  Duration: 00:03:11.24, start: 0.000000, bitrate: 1536 kb/s
>>    Stream #0:0: Video: mpeg4 (DX50 / 0x30355844), yuv420p, 720x576
>>
>> Your original video is a 4:3 standard definition 720x576 file. You
>> might have a video player (QuickTime, for instance) that lies slightly
>> and tells you the file is 768x576 because it knows that standard
>> definition pixels are not square (although Apple should scale up to
>> 788x576, but that's another argument).
> 
> I'm interested - man mplayer lists:
> 
> spal:    768x576 (square pixel PAL)
> 
> Does this reflect a common misconception?
> 
> On the other hand 788 is not divisible by 16 ...
> 
> If you don't mind elaborating.

Yes - it is a common misconception.

This BBC web page had lots of information, until the great web cull of
early 2011, so here's a link to the way-back-machine:

http://replay.waybackmachine.org/20100826080627/www.bbc.co.uk/commissioning/tvbranding/picturesize.shtml

This Adobe web page describes how they got it wrong all the way up
before After Effects CS4:

http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906c6dea-7f3aa.html

This page also describes the difference between Adobe After Effects CS3
and CS4:

http://www.mikeafford.com/blog/2009/03/pal-d1-dv-widescreen-square-pixel-settings-in-after-effects-cs4-vs-cs3/

-- 
Mark