wrong horizontal position of dvbsuboverlay if used behind videomixer?

[Thomas Loewe]

Hi,

since I use the videomixer to implement picture in picture the horizontal positioning of subtitles via dvbsuboverlay is incorrect when putting it behind the videomixer.

For example: the video resolution is 720x576 in 16:9 and videomixer makes it 1024x576 (768x576 in 4:3). Subtitles are shown on the left and not centered because it uses 720 instead 1024.

The position is of course correct when putting it before the videomixer, but then the subtitles are overlayd by the pip.

Is this a bug?

Thanks,
Thomas

[Janne Grunau]

On 29.01.2011 13:07, Thomas Loewe wrote:

>
> since I use the videomixer to implement picture in picture the horizontal
> positioning of subtitles via dvbsuboverlay is incorrect when putting it
> behind the videomixer.
>
> For example: the video resolution is 720x576 in 16:9 and videomixer makes it
> 1024x576 (768x576 in 4:3). Subtitles are shown on the left and not centered
> because it uses 720 instead 1024.
>
> The position is of course correct when putting it before the videomixer, but
> then the subtitles are overlayd by the pip.
>
> Is this a bug?

Depends on the sample aspect ratio of the subtitles. In which case do
the subtitles look correct?

Can you make a sample available?

Janne

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[Thomas Loewe]

> Depends on the sample aspect ratio of the subtitles. In which case do the subtitles look correct?
Only when putting dvbsuboverlay before videomixer. I haven't seen any channel yet (german tv on astra) which looks correct.

> Can you make a sample available?
Here's a short transportstream and the screenshot of the wrong position: http://ul.to/wegq5g

Thanks,
Thomas