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Solved
AVIStreamGetFrameOpen
Posted on 2001-07-01
Hi,
I got a problem with AVIStreamGetFrameOpen, it keeps failing returning a null pointer. The problem occurs only when I specify the bitmapinfoheader which i want to!
Code Fragment:
BITMAPINFOHEADER wanted;
wanted.biBitCount = 8;
wanted.biClrImportant = 0;
wanted.biClrUsed = 0;
wanted.biCompression = BI_RGB;
wanted.biPlanes = 1;
wanted.biSize = 40;
wanted.biXPelsPerMeter = 0;
wanted.biYPelsPerMeter = 0;
wanted.biHeight = 300;
wanted.biWidth = 300;
wanted.biSizeImage = (((wanted.biWidth * 3) + 3) &
0xFFFC) * wanted.biHeight;
getFrame = AVIStreamGetFrameOpen(avi,
ASSERT (getFrame != NULL);
I got a problem with AVIStreamGetFrameOpen, it keeps failing returning a null pointer. The problem occurs only when I specify the bitmapinfoheader which i want to!
Code Fragment:
BITMAPINFOHEADER wanted;
wanted.biBitCount = 8;
wanted.biClrImportant = 0;
wanted.biClrUsed = 0;
wanted.biCompression = BI_RGB;
wanted.biPlanes = 1;
wanted.biSize = 40;
wanted.biXPelsPerMeter = 0;
wanted.biYPelsPerMeter = 0;
wanted.biHeight = 300;
wanted.biWidth = 300;
wanted.biSizeImage = (((wanted.biWidth * 3) + 3) &
0xFFFC) * wanted.biHeight;
getFrame = AVIStreamGetFrameOpen(avi,
ASSERT (getFrame != NULL);
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6 Comments
Hi,
As your code shows:
...
biCompression = BI_RGB
...
"The problem
occurs only when I specify the bitmapinfoheader which i want to!
"->to any RGB format, the function returns NULL.
As your code shows:
...
biCompression = BI_RGB
...
"The problem
occurs only when I specify the bitmapinfoheader which i want to!
"->to any RGB format, the function returns NULL.
Why would it do that?
It should return a pointer to a get frame object.
I tried BI_BITFIELDS and BI_RLE8
In Delphi making the equivalent API calls works!
It should return a pointer to a get frame object.
I tried BI_BITFIELDS and BI_RLE8
In Delphi making the equivalent API calls works!
What I am saying is, there was nothing with this BITMAPINFOHEADER when i made the AVI API calls from Delphi.
Anyone any clues??
Anyone any clues??
From MSDN:
If the system cannot find a decompressor that can decompress the stream to the given format, or to any RGB format, the function returns NULL.
Therefore, ... Try
getFrame = AVIStreamGetFrameOpen(avi,
or
getFrame = AVIStreamGetFrameOpen(avi,
-- Dan
If the system cannot find a decompressor that can decompress the stream to the given format, or to any RGB format, the function returns NULL.
Therefore, ... Try
getFrame = AVIStreamGetFrameOpen(avi,
or
getFrame = AVIStreamGetFrameOpen(avi,
-- Dan
Cheers Dan, My mistake. I was asking for the CODEC to give me a different sized image, to what it was.
Hi RichJackson,
I'm sure that you feel it was a kind thing to award me some points even thought my answer did not solve your problem.
But I'm here to inform you that a C grade in response to a comment is considered an insult. I see that you tend to give out a lot of C's, so I'd like to remind you to please read the EE grading guildelines:
http://www.experts-exchange.com/jsp/cmtyQuestAnswer.jsp#3
If you cannot get a complete answer, you should post additional comments ansking for clarifications or delete the question.
Thanks,
-- Dan
I'm sure that you feel it was a kind thing to award me some points even thought my answer did not solve your problem.
But I'm here to inform you that a C grade in response to a comment is considered an insult. I see that you tend to give out a lot of C's, so I'd like to remind you to please read the EE grading guildelines:
http://www.experts-exchange.com/jsp/cmtyQuestAnswer.jsp#3
If you cannot get a complete answer, you should post additional comments ansking for clarifications or delete the question.
Thanks,
-- Dan
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