[vdr] How to convert a JPEG image to an I-frame?

Theunis Potgieter theunis.potgieter at gmail.com
Tue Nov 13 06:43:41 CET 2007


Would the jagged edges appear because the source was meant for 50Hz
Interlaced, while the hardware is set for 60Hz interlaced? I had a similar
problem on my nvidia tv-out device, and had to revert back to older drivers.

nvidia-drivers 1.0.7185, is the last driver that still support setting the
tv-out device to 50Hz, instead of the default: PAL 60Hz. Any driver that
nvidia released later on, doesn't seem to support tv-out @50Hz, no
xorg.confsettings will work. My card is an old Geforce4 440MX, so the
new cards
requires later drivers :(

I hope this maybe helps somebody.

Theunis

On 13/11/2007, Reinhard Nissl <rnissl at gmx.de> wrote:
>
> Hi,
>
> Reinhard Nissl schrieb:
>
> >> Yes, they are smooth for a brief moment, and then get jagged.
> >
> > I recall this behavior when I had a FF card for testing. Maybe it's a
> > feature to stop flickering one pixel high horizontal lines in still
> > images by doubling one field of the frame. Maybe there exists a switch
> > to turn this feature off.
>
> To prove the above mentioned behavior, please try this synthetic file:
>
> http://home.vrweb.de/~rnissl/radio/field_test.mpg
>
> Actually, it should display like here:
> http://home.vrweb.de/~rnissl/radio/field_test.png
>
> But if the above is true, you'll get some heavy flicker on TV and then
> it will split the screen into a top and bottom half where one half will
> be white and the other one black. This will happen when the FF card
> decides to display just a single field of the frame.
>
> > You've tried to repeat an I frame forever. Try to remove the sequence
> > end code (00 00 01 B7) from the end of the file before mplexing and the
> > MPEG program end code (00 00 01 B9) from the file after mplexing. Maybe
> > remove everything up to the first video PES packet from the final file.
>
> Bye.
> --
> Dipl.-Inform. (FH) Reinhard Nissl
> mailto:rnissl at gmx.de
>
> _______________________________________________
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>



-- 
Style may not be the answer, but at least it's a workable alternative.
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