Getting info from avi

[Zarxrax]

Please bear with me here, as I'm verrrry inexperienced...
First of all, I am using Visual C# Express Edition.
I have been searching on the MSDN for some hours now trying to figure out these things, but I don't see anything that looks like it might be useful (or I don't understand what I'm seeing :p).

First of all, I need to open an avi file and grab the framerate. I imagine this ought to be pretty easy, if I could figure out how :confused:
Secondly, and I'm sure this must be far more difficult... I want to find the timecodes for each keyframe in the avi file.

Thanks in advance if you can help this poor newbie to understand these things :)

[Doom9]

check out MeGUI.. it does just that, and a couple more things with anything that AVIFile (VfW) can open. Keep in mind though, using open source code means you have to open source your program as well..

[Sirber]

Look for MediaInfo lib, I use it in Realanime fo get infos on all my sources.

[Doom9]

as far as keyframes go, there's the archanger program from the xvid forum that's also written in .net and which can identify frame types.

[Zarxrax]

Thanks guys, this is probably what I need :)

[Inc]

Here is an examlpe of how you get the main info of an avifile using the vfw interface (vfw.h) in c/c++.
The Keyword is AVIFILEINFO.

AVIFileInit();

PAVIFILE avi;
int res=AVIFileOpen(&avi, szFileName, OF_READ, NULL);

if (res!=AVIERR_OK)
{
//an error occures
if (avi!=NULL)
AVIFileRelease(avi);

return FALSE;
}

AVIFILEINFO avi_info;
AVIFileInfo(avi, &avi_info, sizeof(AVIFILEINFO));

CString szFileInfo;
szFileInfo.Format("Dimention: %dx%d\n"
"Length: %d frames\n"
"Max bytes per second: %d\n"
"Samples per second: %d\n"
"Streams: %d\n"
"File Type: %d", avi_info.dwWidth,
avi_info.dwHeight,
avi_info.dwLength,
avi_info.dwMaxBytesPerSec,
(DWORD) (avi_info.dwRate / avi_info.dwScale),
avi_info.dwStreams,
avi_info.szFileType);

AfxMessageBox(szFileInfo, MB_ICONINFORMATION | MB_OK);

PAVISTREAM pStream;
res=AVIFileGetStream(avi, &pStream, streamtypeVIDEO /*video stream*/,
0 /*first stream*/);

if (res!=AVIERR_OK)
{
if (pStream!=NULL)
AVIStreamRelease(pStream);

AVIFileExit();
return FALSE;
}



Taken from here:
http://www.codeproject.com/audio/ExtractAVIFrames.asp
(a nice knowledgepool btw.)

[stax76]

Somebody is maintaining a C# avifile wrapper on CodeProject.

[Zarxrax]

Wow, thanks guys. So many options :)