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| toomore |
 Posted: Dec 18 2002, 06:00 PM |
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Unregistered
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I've I couldn't get the correct audio frame count of a AVI file by use its StreamInfo structure. So I try to use the AVIStreamRead API to test the audio frame count repeatly. It works well when I read some avi file which less than 2GB, but when I use it to analyse a big avi file(8.2GB), the API return an error. These're my code:
LONG hr;
int StartSample;
int EndSample;
int i;
int AudioFrameCount = 0;
LONG ActualBytes;
LONG ActualSamples;
StartSample = AVIStreamStart(pAVIStream);
EndSample = AVIStreamEnd(pAVIStream);
for (i = StartSample; i < EndSample; i += ActualSamples)
{
hr = AVIStreamRead(pAVIStream, StartSample, AVISTREAMREAD_CONVENIENT,
NULL, 0, &ActualBytes, &ActualSamples);
if (0 != hr)
{
//some error processing
}
else
++AudioFrameCount;
}
I've read the VirtualDub Source, but I can't understand the source. It's seems use some low-level file I/O API to read the data of a AVI file, not Microsoft's AVI API. Should I do the same thing?
Thanks. |
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| fccHandler |
| Posted: Dec 18 2002, 06:31 PM |
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Administrator n00b
Group: Moderators
Posts: 3961
Member No.: 280
Joined: 13-September 02
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Hello.
Microsoft's AVI API freaks out with files larger than 2GB. (I wouldn't call it a bug, though, since no AVI 1.0 file should ever be that big.) You could try using VirtualDub to save a segmented AVI (each segment < 2GB) and then I guess you could use the API to parse the segments.
Other than that, you'll have to write your own parser. 
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May the FOURCC be with you... |
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| muf |
| Posted: Dec 20 2002, 05:38 PM |
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MCF team member
Group: Moderators
Posts: 179
Member No.: 46
Joined: 21-July 02
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| QUOTE (fccHandler @ Dec 18 2002, 12:31 PM) | Hello.
Microsoft's AVI API freaks out with files larger than 2GB. (I wouldn't call it a bug, though, since no AVI 1.0 file should ever be that big.) You could try using VirtualDub to save a segmented AVI (each segment < 2GB) and then I guess you could use the API to parse the segments.
Other than that, you'll have to write your own parser. |
OpenDML and a non-FAT (NTFS, ext2, etc) filesystem should be able to become over 4 GB.
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| fccHandler |
| Posted: Dec 20 2002, 07:03 PM |
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Administrator n00b
Group: Moderators
Posts: 3961
Member No.: 280
Joined: 13-September 02
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@muf: I assume the file is OpenDML since he says it's 8.2GB. Can the Windows API parse OpenDML?
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May the FOURCC be with you... |
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| muf |
| Posted: Dec 20 2002, 07:27 PM |
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MCF team member
Group: Moderators
Posts: 179
Member No.: 46
Joined: 21-July 02
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| QUOTE (fccHandler @ Dec 20 2002, 01:03 PM) | | @muf: I assume the file is OpenDML since he says it's 8.2GB. Can the Windows API parse OpenDML? |
If it wouldn't, the purpose of OpenDML would be quite useless. Btw, OpenDML is quite old. I wouldn't know why win98 and up wouldn't support it.
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| phaeron |
| Posted: Dec 20 2002, 10:26 PM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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DirectShow can parse OpenDML hierarchical indexing information, but AVIFile, which you are using, cannot. Microsoft hasn't done anything to VFW for a long time except port it to Win64.
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