Re: libdv1394, Senior Design Project

On Thu, Jan 28, 2010 at 9:36 AM, Howard Huang <[email protected]> wrote:
> I guess we can use that... But now, I guess my question is, how do I
> separate the stream into frames? We need to send that output into a part

dvgrab always supplies a stream beginning at a frame, and a frame is
always 120000 bytes if NTSC and 144000 if PAL.

> of the program that processes each frame individually... I think I'll
> have to write this code because we are running two cameras at the same
> time, and we have to keep track of the frames to keep the video in sync.
>
> Where can I find information on how to translate a DV stream into
> individual frames?

You can decode using either FFmpeg or libdv. If you just need video
and not audio, you can pipe dvgrab to ffmpeg and have ffmpeg output
yuv4mpeg to stdout and then your app can process yuv4mpeg. The source
of /ffmpeg/libavformat/yuv4mpeg.c and viewing the output in 'hexdump
-C' will help you understand the simple yuv4mpeg format. If you need
RGB, then just search for yuv2rgb code.

> Thanks!
> Howard
>
> Stefan Richter wrote:
>> Howard Huang wrote:
>>
>>> I'm trying to write a program for my senior design project that
>>> captures video from a camera that is plugged in (like dvgrab) but
>>> sends the data to GPU memory.
>>>
>> [...]
>>
>>> Any suggestions on where to start?
>>>
>>
>> dvgrab, test-dv, and test-mpeg2 can write to stdout which you can pipe
>> to stdin of a video player like xine.  So, here is a complete program: :-)
>>       dvgrab - | xine stdin:/
>>
>> Furthermore, kino has live video preview.  Also have a look through
>> http://ieee1394.wiki.kernel.org/index.php/Category:Links .
>>
>
>
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