MP4Box now muxes AC3 into MP4

[bond]

according to the gpac dev:
http://sourceforge.net/tracker/?func=detail&atid=571741&aid=2069646&group_id=84101

AC3 support is now available on CVS.

MP4Box
* Enhanced AC3 is NOT supported
* AC3 mux/demux from RAW AC3 only
* RTP hinting is not done yet

CLients
* playback should be supported through ffmpeg (not tested yet)

[NorthPole]

Does anyone have a windows binary build yet?

[Kurtnoise]

http://kurtnoise.free.fr/index.php?dir=mp4tools/&file=MP4Box-0.4.5-dev_20081101.zip

I've made a workaround because the cvs build doesn't work properly for me (patch included in my package)...files play fine with VLC.


Command line as usual:
MP4Box -add input.ac3 output.mp4

[Kurtnoise]

forgot to mention that it plays fine also (audio streams only) with mpc using its own mp4 splitter...;)

http://pix.nofrag.com/8/4/6/a2ba00150e85e87c56aded5555bcd.png (http://pix.nofrag.com/8/4/6/a2ba00150e85e87c56aded5555bcd.html)

[bond]

forgot to mention that it plays fine also (audio streams only) with mpc using its own mp4 splitter...;)mp4splitter of gabest has been updated 2 years ago last time and still handels ac3-in-mp4?

[SeeMoreDigital]

mp4splitter of gabest has been updated 2 years ago last time and still handels ac3-in-mp4?Yes... but sadly it only works when playing "audio only" AC3 in .MP4 files!

It would be great if it could be updated to the revised spec...

[Oleg Rode]

http://kurtnoise.free.fr/index.php?dir=mp4tools/&file=MP4Box-0.4.5-dev_20081101.zip

I've made a workaround because the cvs build doesn't work properly for me (patch included in my package)...files play fine with VLC.


Command line as usual:
MP4Box -add input.ac3 output.mp4
OK, and how to use it? Program doesn't work... Windows says "The file is broken, Please reinstal your program":confused:

[crypto]

mp4splitter of gabest has been updated 2 years ago last time and still handels ac3-in-mp4?
In audio only mode the splitter just scans for sync words and doesn't really know what it is doing. This however is sufficient to extract ac3 frames from the stream.

[video_magic]

I have tried to run the new mp4box compiled by kurtnoise13 but at the command prompt I only get an error:

"the system cannot execute the specified program"

My system is Windows XP SP2, a P4 3.2ghz (cedar mill core). My GPAC install MP4Box from 2007 has always run.

I had extracted the files from the kurtnoise13 download into their own folder and tried to run from the command prompt.
Please help because I would like to try out the updated mp4box - thanks!

[Kurtnoise]

Is it better when you install this (http://www.microsoft.com/downloads/details.aspx?familyid=9B2DA534-3E03-4391-8A4D-074B9F2BC1BF&displaylang=en) ?

[video_magic]

Thanks, - yes, it is! :D

When I type mp4box now it gives me the help prompt options, I'm going to try re-muxing my mp4's now, thanks Kurtnoise13.

[rack04]

http://kurtnoise.free.fr/index.php?dir=mp4tools/&file=MP4Box-0.4.5-dev_20081101.zip

I've made a workaround because the cvs build doesn't work properly for me (patch included in my package)...files play fine with VLC.


Command line as usual:
MP4Box -add input.ac3 output.mp4

Any chance we could see an update to YAMB? :thanks:

[NorthPole]

@Kurtnoise13

Thanks for the new build! I'll give it a try.

[Kurtnoise]

Any chance we could see an update to YAMB? :thanks:
as soon as there is a way to play back those files with any dshow players, then yes probably...;)

I'm trying to patch the gabest splitter (& Bento4 because it uses its code).

[RobertG]

I have been looking for technical details on this for quite a while ... how does MP4Box concatenate two files together in terms of the audio stream (AC3 or AAC)? I ask because usually the audio in each mp4 file can be slightly shorter than the video (milliseconds, but shorter just the same). When it concatenates the audio, does it pad the end of the audio in each stream to ensure that subsequent concatenated streams are in sync with their own video? Hope that makes sense ... if not let me know.

[sl1pkn07]

the CVS version not work

sl1pkn07@SpinFlo:~/aplicaciones/gpac-cvs/bin/gcc$ ./MP4Box -add /media/WDGP1TB-1/5cmaudio.ac3 audio.mp4
Unknown input file type
Unknown input file type
Converting to ISMA Audio-Video MP4 file...
Saving to audio.mp4: 0.500 secs Interleaving
sl1pkn07@SpinFlo:~/aplicaciones/gpac-cvs/bin/gcc$ ./MP4Box -version
MP4Box - GPAC version 0.4.5-DEV (build 32)
GPAC Copyright: (c) Jean Le Feuvre 2000-2005
(c) ENST 2005-200X
sl1pkn07@SpinFlo:~/aplicaciones/gpac-cvs/bin/gcc$

[Kurtnoise]

are you able to play back this ac3 stream with a decent player ?

if yes, it's maybe a path issue...

and applying this patch (http://pastebin.com/f7e2753d) can help.

[sl1pkn07]

ok ok. i have compile (with patch)... but no install (run directly from binary compile path)

i try install and run from my /home:

sl1pkn07@SpinFlo:~$ MP4Box -add /media/WDGP1TB-1/5cmaudio.ac3 prueba2.mp4
AC3 import - sample rate 48000 - 4 channels
Saving to prueba2.mp4: 0.500 secs Interleaving
sl1pkn07@SpinFlo:~$

but no playback

sl1pkn07@SpinFlo:~$ mplayer prueba2.mp4
MPlayer dev-SVN-r27979-4.3.2 (C) 2000-2008 MPlayer Team
CPU: AMD Athlon(tm) 64 FX-60 Dual Core Processor (Family: 15, Model: 35, Stepping: 2)
CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
127 audio & 261 video codecs
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick
mplayer: could not connect to socket
mplayer: Connection refused
Failed to open LIRC support. You will not be able to use your remote control.

Playing prueba2.mp4.
libavformat file format detected.
[lavf] Audio stream found, -aid 0
==========================================================================
Cannot find codec for audio format 0x332D6361.
Read DOCS/HTML/en/codecs.html!
Audio: no sound
Video: no video


Exiting... (End of file)
sl1pkn07@SpinFlo:~$

add "format 0x332D6361" in codec.conf in "audiocodec ffac3" config and works!

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 448.0 kbit/29.17% (ratio: 56000->192000)
Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
==========================================================================

tankls a lot