[mythtv-users] Getting Auto-Letterbox to work on NVIDIA ION

Justin Johnson justin.johnson3 at gmail.com
Mon Dec 27 22:31:59 UTC 2010

On Mon, Dec 27, 2010 at 4:04 PM, Andrew Cagney <andrew.cagney at gmail.com> wrote:
> Fwiw,
> One wart I found with using the NVIDIA ION hardware decoder is that
> auto-sizing (for instance to trim a letter-box program) doesn't work -
> its because the auto-letter box detection is only done by the software
> decoders.
> With the assumption that your tv is 16:9, I fixed this by adding an
> extra playback profile VDPAU Letterbox with:
>   res>=0 720 -> vdpau & vdpau
>   res> 0 0 -> ffmpeg & vdpau
> so that the s/w decoder, which will auto-trim the letterbox, was used
> on analog (and low-res) programs and hardware on anything in
> higher-res digital.  It works on the assumption that only old
> low-resolution programs will need letterboxing and typical ION h/w has
> enough grunt of decoding low res programs.
> Adding this to the default VDPAU set might be helpful.
> enjoy,
> Andrew

Interesting solution. Whil I don't have ION, I do use VDPAU for
decoding and always missed the auto zoom on SD content. Granted, now
that I have an HD-PVR most of my content is in HD so it's mostly a
non-issue. But I still like it and will be applying to my system.

--Justin Johnson

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