[vlc-devel] Crystal HD for 1080i MPEG2 and closed captions on low-end system

Patrick Jackson pejackson at gmail.com
Thu Jun 9 23:01:31 CEST 2011

Thank you for the prompt response.

Doing some more testing with the software-only (i.e. no Crystal HD card) method, it seems that the closed-caption blending is really taxing the CPU. The way the letters are all blended to block the least amount of picture is very nice, but is there a setting that would make this easier on the CPU (like a black-barred background)?

On Jun 7, 2011, at 5:37 PM, Jean-Baptiste Kempf wrote:

> Hello Patrick,
> On Tue, Jun 07, 2011 at 05:15:05PM -0500, Patrick Jackson wrote :
>> To try and work-around this, I stuck a Crystal HD (BCM70015 version)
>> mini-PCIe decoder in the system and built the latest VLC 1.2 trunk code. I'm
>> also using Jarod Wilson's crystalhd driver and libs, built from the latest
>> trunk source. It seems to be using the card fine and drops the CPU use down,
>> as expected.
> Wow, I am glad someone actually tested this code.
> I am very sorry for its crapiness.
>> Unfortunately, neither deinterlacing nor closed-captions work for me when
>> the crystal codec is in use. The video definitely looks interlaced, and this
>> shows up on the console:
>> I know Crystal HD support is fairly new, but should software deinterlacing
>> and closed caption display work with Crystal HD decoding in theory? If so,
>> any pointers on debugging these problems?
>> A broader question is: is there a better way to get this to run well on my
>> system (with or without the Crystal HD)?
> Well, the thing is that, so far, the crystalHD decoder outputs in YUYV
> and we don't have a deinterlacer supporting this format.
> Same reason for blending the subtitles.
> - One way would be to force it to use OUTPUT_MODE420_NV12 instead, even if
>  people from Broadcom advised me against it. NV12 is well supported in
>  VLC.
> - One second way would be to finally understand HOW THE HELL do I activate
>  hardware deinterlacing in BCM. I don't get it and the answer "it should
>  be easy if you look at the driver code" is not one that I liked/had time
>  to do.
> Best Regards,
> -- 
> Jean-Baptiste Kempf
> http://www.jbkempf.com/ - +33 672 704 734
> Sent from my Electronic Device
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