MP3 also ISO-MPEG4

[Berndxx]

Hi,

will be AAC the only audioformat conformity with
ISO-MPEG4 or is it possible that also MP3 will
work.

Bernd, Bavaria :devil:

[Berndxx]

??? Does anyone know a (possible) answer?

[Doom9]

what do we have in the forum rules? don't post followups like that.

when we talk about pc playback mp3 is no problem.. mp4creator does support it. But on standalones that may be another issue altogether. But as there are not even any standards for such standalones yet nobody can really tell you (well.. I guess the people working on such devices could but they most likely cannot talk).

mp4creator also supports ac3 btw..

[int 21h]

The only reason I can even fathom using this sort of format right now is MCF-CD, and the eventual release of a MCF-CD DirectShow demultiplexxer. Other than that, you'll obviously need to wait if you intend to play MP4 on a standalone unit (you can already play them on PDAs, Cellphones, etc, but low bitrate of course).

[Berndxx]

Thank you for helping me.

Sorry to Doom9 for my second post...i have
not read the forum rules but now i know them :rolleyes:

please do not sanction me for this mistake

[Neo Neko]

MPEG1 layers 1, 2, and 3 are in the ISO specs. MPEG2, MPEG2-VBR, and MPEG4 audio are included as well. It would be almost insane to fathom them not being supported. Many standalones support them already. MPEG4 would be the only current exception. AC3 is very iffy and Vorbis is even more so. All these and more will end up in use on the PC, but standalones are a bit queer in this fact.

[Berndxx]

But the question is, if it will be possible to
mux an ISO-MPEG4 video-file with a mp3-audio-file
and play this on a standalone player. When you mux
an mpeg2-file with an mp3-file (if this is possible)
then you will not be able to play this on a
DVD-Player with SVCD-Support even if this device
support mp3.

As Doom9 said, that nobody except the developers
of such devices could answer this question at this
time.

I asked this, because i am a fan of ogg-vorbis but
intend to play my DivX-Movies on a standalone player
with minimal waste of time in conversion.

Bernd, Bavaria :devil:

[DeXT]

Well it's been said already that the only standard audio stream allowed in a MP4 file are: AAC, CELP, VQF. No MP3, no AC3. You CAN mux them, but this is just a hack. It's not standard, and there is a big chance your standalone player will not be able to play it.

If you want to create a 100% standard MP4 file just use MPEG-4 video and AAC audio.

This is the same issue about mux'ing MP3 on a MPEG-1 & MPEG-2 stream. The problem is, there are no standard identifiers defined for content other than the allowed ones.

Wether the standalone players will accept this or not, it's up to their developers. This has not been approved by the MPEG-4 standard so they simply don't have to support it.

[temporance]

Originally posted by DeXT
Well it's been said already that the only standard audio stream allowed in a MP4 file are: AAC, CELP, VQF. No MP3, no AC3. You CAN mux them, but this is just a hack. It's not standard, and there is a big chance your standalone player will not be able to play it.

This is not true. The mp4 file spec tells us exactly how to create an audio track using MPEG-1 or MPEG-2 audio (commonly known as mp3). It's perfectly standard. mp4 files can contain more different formats than just MPEG-4 audio and video.

Take it from an industry veteran, stand-alone players will have an mp3 decoder (for playing mp3 audio tracks on CD-R) and will be able to play DivX/mp3 movies in mp4 format.