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

Klaus Schmidinger Klaus.Schmidinger at cadsoft.de
Thu Dec 27 13:22:19 CET 2007


On 11/13/07 00:28, Reinhard Nissl 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.

When I display field_test.mpg via DeviceStillPicture() on my FF DVB card
I see a picture that has a top and a bottom half that rapidly flicker
black and white (top black, bottom white and vice versa).

After like half a second the picture gets static, and the top half is
solid black, while the bottom half is solid white.

I never see anything like the field_test.png you posted (with alternating
black and white lines).

Klaus





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