[vdr] PVRINPUT plugin and "black/cinema bars"

Rob Davis rob at davis-family.info
Mon Apr 26 22:56:10 CEST 2010


> On Mon, Apr 26, 2010 at 12:42 PM, Martin Dauskardt <md001 at gmx.de> wrote:
>> The mpeg is not delivered by the broadcaster, it is generated by the
>> encoder.
>> The content of the header is a result of the V4L2_CID_MPEG_VIDEO_ASPECT
>> setting done by the application.
>
> If the aspect ratio flag is unreliable, again, you can always just use
> the resolution and  calculate it.
>
>>> You _could_ write some functions to detect and remove letterboxing,
>>> though I don't know anyone motivated enough to actually do it.
>>
>> The main goal of the pvrinput-plugin is to use the hardware encoder.I
>> think it
>> is a bad idea to do software-based on-the-fly-recoding.
>
> If you want to limit the plugin to using only the hardware then I
> agree.  However, if you want to provide capabilities beyond what the
> hardware is capable of then software is the only other place to do it.
>  This is perfectly fine, although it probably means the user wasted
> his money on a hardware decoder if he's just going to do software
> decoding anyways.  It doesn't hurt to put more consideration into what
> you want/need before pouring money into hardware.  I know guys that
> threw a lot of money at hardware decoders only to replace them with
> cheap vdpau-capable video cards.  To each his own I suppose. :)
>
> Cheers


Except this is an input device, not an output device.  It converts an
analogue signal to mpeg2, as such, it needs to make guesses about what
it's going to find..




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