[AG-TECH] HD on AG
Claus Endres
claus at endresconsulting.com
Mon Dec 15 02:48:52 CST 2008
Hi Douglas,
Do you know which HD H264 camcorders are supported by the UVC video
driver?
I would be very interested to play around with one...
Regards,
Claus.
Douglas Kosovic wrote:
> Hi,
>
>>>>> I, too, am extremely interested in vic supporting HD formats,
>>>>> (including uncompressed!) One of the issues is the encoding latency
>>>>> problem. Not sure there's a nice low latency encoding solution out
>>>>> there yet. Alternatively, we might look at cheap hardware encoders
>>>>> as the answer or HDMI cards to take the input from the camera.
>>>>> Can vic be made to take the output of, say, the BlackMagic Design
>>>>> HDMI card on a Mac?
>
> MacOS X UCL vic works out of the box with the BlackMagic Design HDMI
> capture card, but gets scalled down to 640x480 for the large capture
> option.
>
> A quick hack to add 1980x1080 support is to modify the following width &
> height lines in video/grabber-macosx.cpp :
> switch (decimate_) {
> case 1: // full-sized
> width_ = SP601_NTSC_WIDTH;
> height_ = SP601_NTSC_HEIGHT;
>
> to:
> width_ = 1920;
> height_ = 1080;
>
> Windows UCL vic on the other hand crashes with the BlackMagic Design
> HDMI capture card as it currently doesn't support the BlackMagic YUV
> colorspace.
>
> I wouldn't mind adding support for USB HD camcorders that support UVC
> (USB Video Class) H.264 streaming over USB, but I currently don't have
> access to one. Note: Not all USB based camcorders support UVC (e.g. Sony
> Hanycams).
>
>>>>> I am currently using AGDV under windows but would like to move to
>>>>> linux and use the HDV/DV linux vic for the DV part; i don't think
>>>>> it's encoding the HDV, just accepting it as input from the camera
>>>>> already encoded??? [chris?]
>>>>>
>>>> It is possible to just packetise the compressed data from a camera,
>>>> though as Chris points out it tends to have quite high latency. That
>>>> is why the ultragrid and derivatives used uncompressed HD as their
>>>> sources. VIC doesn't currently support mpeg2 nor does support
>>>> packetisation of an existing compressed mpeg2 stream.
>>>>
>>>
>>> wait, i thought chris' vic supported HDV, which i assume is mp4???
>>>
>> AFAIK most cameras support HDV - which is closely related to MPEG-2:
>> http://en.wikipedia.org/wiki/HDV#HDV_720p
>
> Mostly just the DV firewire based camcorders, the harddisk USB based
> ones are now mostly AVCHD (MPEG-4 AVC/H.264).
>
>>> also, how hard/easy would it be for vic to support packetizing
>>> uncompressed HD?
>>>
>> Not that hard - one needs to read the [RTP and codec] specs and code
>> it up - or borrow someone else's....
>>
>> Piers.
>>
>>> :-)
>>>
>>> -gurcharan
>>>>
>>>> Piers
>>>>
>>>>
>>>>> My ideal would be to encode the presenter's laptop output and
>>>>> deliver that as just another video stream along side the
>>>>> presenter's video and the audience video and have autoplace lay
>>>>> them out nicely in a framed window, a la Adobe Connect or similar
>>>>> products, so the presenter, the slides, and additional commentary
>>>>> could be nicely recorded for later videoon demand playback.
>>>>>
>>>>> Just my opinion (and need),
>>>>>
>>>>> -gurcharan
>>>>>
>>>>> Piers O'Hanlon wrote:
>>>>>
>>>>>>
>>>>>> Hi Derek,
>>>>>>
>>>>>> In principle VIC should be able encode and decode HD video - using
>>>>>> one of the codecs that support such resolutions e.g. H.264 or h261as.
>>>>>>
>>>>>> One needs to modify some of the configuration code in VIC to allow
>>>>>> selection of larger resolutions (ie HD one needs something from
>>>>>> 720p (1024x720) upwards). And of course an HD source is necessary.
>>>>>> We don't currently have access to any HD kit so haven't had a
>>>>>> chance to work on it but anyone is welcome to try!
>>>>>>
>>>>>> Cheers,
>>>>>> Piers
>>>>>>
>>>>>> 2008/10/22 Vine, Derek A <Derek.Vine at usd.edu>:
>>>>>>
>>>>>>> Hello all,
>>>>>>>
>>>>>>> I am doing some research to spec. up a new AG room, and the group
>>>>>>> with the money is interested in HD video. I see that The
>>>>>>> University of Queensland has an HDV/DV VIC for Linux based
>>>>>>> systems already, but we would like to stay with Windows.
>>>>>>>
>>>>>>> I was just wondering what kind of time frame I can give them as
>>>>>>> to when HD will be supported in AG on Windows. In particular, an
>>>>>>> HD VIC that will take its video from a capture card with an
>>>>>>> HD-SDI input, like the one attached in the PDF.
>
> I didn't see the PDF, what colorspace does it support? If it's YUV
> 4:2:0, it would probably work with this vic:
>
> http://www.vislab.uq.edu.au/ag3/windows/vic-20081121.zip
>
> (which contained a fix for 480i DV white line artifacts)
>
> Anyway, I started working on adding support for more colorspaces to the
> Windows code a few weeks ago and I might get back to working on the code
> soon.
>
>
>>>>>>> Thank you in advance for your help.
>>>>>>>
>>>>>>> Derek Vine
>>>>>>>
>>>>>>> Communication Network Specialist
>>>>>>> The University of South Dakota
>>>>>>> 414 East Clark Street
>>>>>>> Vermillion, SD 57069
>>>>>>> (605) 677-8215
>>>>>>> dvine at usd.edu
>
--
--------------------------------------------------------
Claus Endres | Phone: +61-3-5998 2310
Endres Consulting Pty. Ltd. | Mobile: +61-418-595 136
10 Facey Road | Fax: +61-3-5998 2540
Devon Meadows, VIC 3977 | claus at endresconsulting.com
More information about the ag-tech
mailing list