Hi Folks,

have anybody seen around a library, which would be able to read metainfo from the files. Basically I'be happy with a bitrate and running time for mp3 files, + display size and refresh rate for video.

Of course, portable ones are preferred, 'cos eventually I am going to plug it into Mutella, which is a unix app.

Thanx,
--Max

for mp3 info see attachement

Attached Files

frame_header.htm.zip (4.5 KB, 64 views)

thanx, that helps with conventional mp3 files. however, AFAIK variable-bandwidth files have an additional tag or whatever, which holds the information about the average bit rate. is it true?

--Max

with mp3 it is the same as with gnutella after "the standart" everybody who thinks he's very smart includes his own headers...

in an mp3 file every frame can use another bitrate without something special. To check if a file VBR you can read two or three frame headers, if all use the same bitrate it is an CBR file...

some time ago, the Xing encoder used a "Xing"-Tag to supply the decoder with data, but no really good mp3-encoder uses the xing-engine (bad quality). You can reach a good quality with FHG IIS Layer3 encoder oder LAME... hope most people use them...?

you can get more info (with C++ Classes) here: http://home.swipnet.se/grd/mp3info/


CU

Thanx for the link. What's about avi filed? Does anybody know something or I'll have to dig through VirtualDub source code or AviFile?

Cheers,
--Max

AVI Graphics Format Overview FAQ [John F. McGowan]: http://www.wotsit.org/download.asp?f=avi_over

AVI File format (MS Word):
http://www.wotsit.org/download.asp?f=avi

Lance Ladic's Info on the AVI Format:
http://www.cs.ubc.ca/spider/ladic/avi.html

OpenDML AVI File Format Extensions V1.0:
http://www.matrox.com/videoweb/odmlff2.htm

Short Overview of AVI features:
http://www.nctech.fr/NCTech/html/English/ConfigAVI.html

DV Video Data and AVI Files:
http://www.microsoft.com/hwdev/tech/...dcap/dvavi.asp