new opensource MP4 project: bento4

[bond]

http://sourceforge.net/projects/bento4

Portable C++ Class Library for parsing and creating ISO MP4 (ISO 14496-12) multimedia files containing MPEG-4 or other types of multimedia streams, such as iTunes .mp4 or other quicktime files.

[Sharktooth]

binaries (VS2003): http://www.webalice.it/f.corriga/bento4/bento4-0.6.rar

[bond]

thx sharktooth!

[Elias]

Portable C++ Class Library for parsing and creating ISO MP4 (ISO 14496-12) multimedia files containing MPEG-4 or other types of multimedia streams, such as iTunes .mp4 or other quicktime files.What's the difference between MPEG-4 Part 12 and Part 14? Does bento4 parse both?

[unskinnyboy]

Part 12 is ISO Base Media File Format (ISO/IEC 14496-12) and is for storing media content. Part 14 (ISO/IEC 14496-14) is the .mp4 container and is derived from Part 12. Probably bento4 works with both.

[Elias]

Part 12 is ISO Base Media File Format (ISO/IEC 14496-12) and is for storing media content.Isn't that what mp4 is doing already? What kind of container abbreviation does Part 12 have?

[Drachir]

What's the difference between MPEG-4 Part 12 and Part 14? Does bento4 parse both?

I would say: 14496-14 = 14496-12 + BIFS/OD

ISO/IEC 14496-14 (http://www.digitalpreservation.gov/formats/fdd/fdd000155.shtml)
ISO/IEC 14496-12 (http://www.digitalpreservation.gov/formats/fdd/fdd000079.shtml)

[Elias]

I would say: 14496-14 = 14496-12 + BIFS/OD

ISO/IEC 14496-14 (http://www.digitalpreservation.gov/formats/fdd/fdd000155.shtml)
ISO/IEC 14496-12 (http://www.digitalpreservation.gov/formats/fdd/fdd000079.shtml)So when it comes down to it, MPEG-4 Part 14 is just an ISMA version of Part 12?

[Drachir]

ISMA != BIFS/OD

You can download the the ISMA 1.1 specs for free. Take a look at them.

BIFS/OD = Mpeg 4 Systems

Some old Systems sample can be found here:
http://www.comelec.enst.fr/~dufourd/mpeg-4/

Some by IBM:
http://www.alphaworks.ibm.com/tech/tk4mpeg4

And take a look at the GPAC regression test:
http://gpac.sourceforge.net/downloads/gpac_regression_tests-0.2.3.zip

[Elias]

ISMA != BIFS/OD

You can download the the ISMA 1.1 specs for free. Take a look at them.

BIFS/OD = Mpeg 4 Systems

Some old Systems sample can be found here:
http://www.comelec.enst.fr/~dufourd/mpeg-4/

Some by IBM:
http://www.alphaworks.ibm.com/tech/tk4mpeg4

And take a look at the GPAC regression test:
http://gpac.sourceforge.net/downloads/gpac_regression_tests-0.2.3.zipWas that a yes or a no? :)

[Drachir]

It was a NO.

ISMA define profiles, bitrate, resolution ... and includes a basic scene (BIFS track) OD to be compatible with Mpeg 4 Systems Players.

[bond]

the iso base file format is the base for lots of file formats: 3gp, jpeg2000 and also part14 mp4 (asp, aac), part15 mp4 (avc)

and you can also have mp4 without bifs/od, so part14 does not require bifs/od (which itself is defined in part1)

[Elias]

Can bento4 be used in VirtualDub (for parsing and creating mp4 files)? Or VirtualDubMod (I know that development is dead)? Gabest said that bento4 was easy to understand when adding it in MPC.

[bond]

Can bento4 be used in VirtualDub (for parsing and creating mp4 files)? Or VirtualDubMod (I know that development is dead)? Gabest said that bento4 was easy to understand when adding it in MPC.why not? you just have to find a dev that codes it ;)

[Elias]

why not? you just have to find a dev that codes it ;)Well, last time I asked Avery Lee, he wasn't exactly up to it (not opposed to it either, but had higher priorities). But with bento4 it shouldn't be difficult I guess. Especially now that Gabest added some nice updates to the source code (ttxt, tx3g, etc) (http://sourceforge.net/forum/forum.php?thread_id=1372778&forum_id=497548).

I suppose that IF Avery would add mp4 reading and writing support to VirtualDub thanks to bento4, more AAC codecs would be released as vfw too?

[bond]

i dunno if bento4 has muxing capabilities, gabest only uses the demuxer and these two are two different things obviously

when i look at the bugs of other mp4 muxers, like ffmpeg and videolan, i wouldnt give too much trust into bento4 creating 100% spec compliant stream with all the possible streams (asp, avc, mp3, aac...). well its just a feeling, based on my experience till now

but i do know for sure that mpeg4ip and gpac are able to create correct files, so these libs should have a higher priority for a "mp4 muxing in virtualdub" project

[Elias]

Portable C++ Class Library for parsing and creating ISO MP4 (ISO 14496-12) multimedia files containing MPEG-4 or other types of multimedia streams, such as iTunes .mp4 or other quicktime files.Well, that's why I thought it could write mp4 files. But I guess you're right, because bento4 is very new, and perhaps not the best mp4 writer as of now.

[bok]

Well, that's why I thought it could write mp4 files. But I guess you're right, because bento4 is very new, and perhaps not the best mp4 writer as of now.
You're right, Bento4 is still fairly new at this point. We've included some features that we could easily find in other places, but we still need to add support for more "codecs" out of the box. Right now, you can "mux" pretty much anything you want, provided that you know the details of the stream's sample description format. We are planning on including better abstraction APIs for those, to make it easy for people to write as well as read pretty much any type of MP4 file.

We'd like to hear from potential users of the library what they think is the most important at this point.

-- The Bento4 guys

[Elias]

@bok: have you checked the changes Gabest made with his bento4 source code in MPC? He added some neat features for ttxt and so on.

[bond]

You're right, Bento4 is still fairly new at this point. We've included some features that we could easily find in other places, but we still need to add support for more "codecs" out of the box. Right now, you can "mux" pretty much anything you want, provided that you know the details of the stream's sample description format. We are planning on including better abstraction APIs for those, to make it easy for people to write as well as read pretty much any type of MP4 file.is there any bento4 cmdl muxer tool available? something like mp4creator from mpeg4ip or mp4box from gpac?

btw plz dont give your tools the same names other existing mp4 tools already use (eg mp4info), cause this can become pretty messy ;)