vpomona
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Digital video
I am writing a Windows NT application using VC++ 6.0.
I am receiving digital video data in through a HOTLink interface card.
I am required to save this digital video frame information to file.( that's the easy part)
Later, I am required to display this video frame data. (frame by frame) or "real-time" from file.
I understand the digital video frame data format. And can extract window size, and each pixel word data.
It seems that this will be a cumbersome task to do display all this information back to the user frame by frame, painting pixel by pixel.
Not knowing to much about displaying video or video in general my questions are:
1) What is the file format of uncompressed video?
2) Is there a tool to display, what I am assuming is called uncompressed video?
3) Should I try to compress the video data?
4) Will compressing the video data change the file format to JPEC or MPEG or whatever it is that will make it easier to replay this digital video?
Thanks for any help you can give.
Vida
I am receiving digital video data in through a HOTLink interface card.
I am required to save this digital video frame information to file.( that's the easy part)
Later, I am required to display this video frame data. (frame by frame) or "real-time" from file.
I understand the digital video frame data format. And can extract window size, and each pixel word data.
It seems that this will be a cumbersome task to do display all this information back to the user frame by frame, painting pixel by pixel.
Not knowing to much about displaying video or video in general my questions are:
1) What is the file format of uncompressed video?
2) Is there a tool to display, what I am assuming is called uncompressed video?
3) Should I try to compress the video data?
4) Will compressing the video data change the file format to JPEC or MPEG or whatever it is that will make it easier to replay this digital video?
Thanks for any help you can give.
Vida
don't need to compress the video, or save in jpeg... just make ur thing most complex
compression is useful only at the hardware level, when it gets transfered through the cable. At software level, it adds overhead only. If u already have the raw data, i don't see any point why u want to compress it.
anyway, there are some pro, standard compressed format like jpeg, mpeg..... there exist many open source decoder works on www. u can just grab one and use, may be make ur life easier. But if u can do directdraw, why bother that??
compression is useful only at the hardware level, when it gets transfered through the cable. At software level, it adds overhead only. If u already have the raw data, i don't see any point why u want to compress it.
anyway, there are some pro, standard compressed format like jpeg, mpeg..... there exist many open source decoder works on www. u can just grab one and use, may be make ur life easier. But if u can do directdraw, why bother that??
ASKER
I am using a Wintriss PCI HOTLink card. COTS card
I will check into using direct draw. and get back later.
It also sounds like I do not need to compress the video data.
I am still unclear if there is a standard form for uncompressed video? *.avi *.jpeg ????????
thanks Vida
I will check into using direct draw. and get back later.
It also sounds like I do not need to compress the video data.
I am still unclear if there is a standard form for uncompressed video? *.avi *.jpeg ????????
thanks Vida
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i use DirectX DirectDraw, that enable me to directly map the entire screen to memory location. By just directly memcpy all your raw data to this memory, your video gets displayed on pc, .... as for frame, you have to some how use a way to control the timing. DirectDraw won't help
but lately there is all this DirectShow stuff which unfortunately i not quite know, if not mistaken, it support video, through some standard format
since u have raw data format, i think better to use the first approach
may i know what video card u use? is it an off the shell product?