GPAC MP4Box Information, Feature Requests & Discussions [No bug reports]

[SeeMoreDigital]

From the last cvs :
http://kurtnoise.free.fr/mp4tools/MP4Box_20060612.zip

Just tried muxing an MPEG-4 SP with MP3 in .AVI test sample into MP4 using YAMB and MP4Box crashed....

Can anybody else confirm?


Cheers

[foxyshadis]

utf-8 or utf-16? Usually "unicode" means utf-16, but not always...

[Kurtnoise]

Just tried muxing an MPEG-4 SP with MP3 in .AVI test sample into MP4 using YAMB and MP4Box crashed....

Can anybody else confirm?
No problem here...

About subtitles:
Arghhhh!!! It doesn't work! i've tried to save my srt in utf-8, I've tried to reconvert the ttxt in utf-8 and I've also tried to make a ttx directly with subrip 1.5b3, but it doesn't work with the new builds, but it works with the old ones...
Could you send me your srt file :: kurtnoise at free dot fr

[Hyper Shinchan]

I've linked an srt in an old post, have you tried it? there is the srt and the converted ttxt.
I can send you another srt later, if you wish.
http://forum.doom9.org/showthread.php?p=838412#post838412

EDIT:
utf-8 or utf-16? Usually "unicode" means utf-16, but not always...
I think UTF-8, actually the 3GPP Timed text supports both UTF-8 and 16, but GPAC MP4Box says that it supports only UTF-8 stuffs in the encoding .

[SeeMoreDigital]

No problem here...After further investigation it would seem the MPEG-4 SP with MP3 in .AVI test sample I was trying to mux was an: -Multipart OpenDML AVI, "rec list" styleoriginally muxed using some dubious setting with AVI-Mux GUI :scared:

[Kurtnoise]

I've linked an srt in an old post, have you tried it?
Using your srt and resaving it into SubRip...I've got no problem. It works fine with MPC & VLC as I said.

Try to play this sample (http://kurtnoise.free.fr/Sample_xvid.mp4) and you'll see. I used this sub file (http://kurtnoise.free.fr/Subs_Unicode.zip).


@SMD : yeah, I'm not sure that MP4Box supports OpenDML...

[Hyper Shinchan]

Using your srt and resaving it into SubRip...I've got no problem. It works fine with MPC & VLC as I said.

Try to play this sample (http://kurtnoise.free.fr/Sample_xvid.mp4) and you'll see. I used this sub file (http://kurtnoise.free.fr/Subs_Unicode.zip).
.
You opened my srt into subrip and you saved it as ttxt or as srt again?and then you muxed it? OK, I'll try the samples.

[Kurtnoise]

I saved it as srt...and yes, I muxed this file with a video stream.

[bond]

last time i tested it mp4box automatically converted my subs to utf-8 from ansi

also storing files as "unicode" in the text editor doesnt give you utf-16. the textpad supports storing as utf-8 tough

[JoeBG]

last time i tested it mp4box automatically converted my subs to utf-8 from ansi


I can confirm that

[Hyper Shinchan]

Well, if I open my srt and I saved them into UTF-16 LE (Unicode for the notepad) it works.
But if I use the -ttxt string to convert them to ttxt and then I try to mux the ttxt it doesn't work (well, it works, but with the problem with the ').
I seriously think that this is a bug, at least it was better in the past.

[IMOON]

Yesterday I have tested your tip with unicode. But it doesn't work for me. Only build 20060303 and earlier works. And with these build it doesn't matter if you use ansi or unicode.

[Hyper Shinchan]

Yesterday I have tested your tip with unicode. But it doesn't work for me. Only build 20060303 and earlier works. And with these build it doesn't matter if you use ansi or unicode.
For me it worked if you directly muxed his srt into an mp4, directly, without converting it into ttxt and editing it.
Anyway you're right, older builds don't give any problem, we would ask to Jean.

[Kurtnoise]

PSP support in MP4Box seems to be partially introduce according to the last cvs changes. Files must have .psp extension instead of mp4/3gp. So, does it mean that AtomChanger is not needed any more ?


http://kurtnoise.free.fr/mp4tools/MP4Box_20060625.zip

[KRUSADER]

Is there any command or something for MPlayer that display MP4 muxed subtitles.

[Hyper Shinchan]

Is there any command or something for MPlayer that display MP4 muxed subtitles.
I guess that MPlayer doesn't support MP4 subtitles (but maybe I'm wrong, anyway at least the build that I was using some time ago said that it's not fully understood the box that contain the subtitle).
PSP support in MP4Box seems to be partially introduce according to the last cvs changes. Files must have .psp extension instead of mp4/3gp. So, does it mean that AtomChanger is not needed any more ?
This is really a good thing, but how can be activated? I don't see a -psp option, at least in the avaible command-lines. Where can I read the changelog of the CVS (I'm not confiedent with SourceForce)?

[Kurtnoise]

This is really a good thing, but how can be activated?
Just using .psp extension I guess...Didn't tried myself coz I don't have a PSP.

Where can I read the changelog of the CVS (I'm not confiedent with SourceForce)?
When you browse CVS repository, the changelog file is in gpac root directory. but all changes/new things in the code aren't included in this file...

[Hyper Shinchan]

Just using .psp extension I guess...Didn't tried myself coz I don't have a PSP.

But PSP uses standard .mp4 exentsion, it doesn't use weird .psp extension... anyway I'll try it.

[Kurtnoise]

Latest CVS Changes 06/07/06
- commit of GPAX (GPAC ActiveX) - controller only works in IE and ActiveX control tester for now.
- bug fixes and API changes to Osmozilla to keep in sync with GPAX. Sample html file can be found in applications/GPAX.
NOTE: both plugin now support browser navigation (ie link to html within MPEG-4 content)
- committed patch from Andrew Voznytsa (with slight modif) for iTunes tag support. Tagging can be done with MP4Box -itags option. The tags are passed in a single string, separated by ':', formatted as 'tag_name=tag_value'. Supported tags names are: album, artist, comment, compilation, composer, created, disk, encoder, genre, name, tempo, track, tracknum, writer.
NOTE: to make sure you mp4 is importable on an iPod, you must:
- use .m4a extension
- specify the right brands: MP4Box -brand "M4A " -ab mp42
This process will soon be automated in mp4 box...
- more LASeR fixes
- fixed AVC/H264 parsing (pic size detection on interleaved stream and cropping were broken)

Not tested personally...anyway here is a win32 build (http://kurtnoise.free.fr/index.php?dir=mp4tools/).

[Kostarum Rex Persia]

Kurtnoise13, your newest MP4BOX build is broken!

[foxyshadis]

That's a useful bugreport if I ever heard one! =D

[Kurtnoise]

your newest MP4BOX build is broken!
More details are needed please...:rolleyes: Which command line did you use ? Have you got any message(s) ? If yes, post it (them) here.

Personally, I used the last build yesterday w/o problem.

[Kostarum Rex Persia]

More details are needed please...:rolleyes: Which command line did you use ? Have you got any message(s) ? If yes, post it (them) here.

Personally, I used the last build yesterday w/o problem.

Well, I always use MeGUI with x264 codec, and MP4 container, of course. I tried various settings, one pass, two pass, but nothing helps. Result is always same: encoded video won't play at all in BSPlayer 2.0. Mplayer also won't play mp4 file.

I tried various sources, but result is same. Broken mp4box build, for sure.

[Edit] I haven't got any error message(s) at all, MeGUI always finish with encoding, but output mp4 file isn't playable.

[SeeMoreDigital]

Hmmm!

No problems here with Kurt's latest build of MP4Box ;)

[Kurtnoise]

Does anyone have tested the iTunes tagging system within MP4Box ? It seems that some tags are not setted correctly (like compilation, composer, disk, genre...). Am I right or I missed something ?

[Stay]

The PSP option doesn't seem to work. I've tried extracting the tracks from a working PSP MP4 file and then remuxed them in mp4Box (Kurtnoise13's 20060722 build) but it shows up as corrupted. (I have changed the filename back to .MP4).
"C:\MP4Box_20060722\MP4Box.exe" -add "C:\MP_ROOT\100ANV01\MAQ10001_track1.h264" -add "C:\MP_ROOT\100ANV01\MAQ10001_track2.aac" "C:\MP_ROOT\100ANV01\MAQ10001.psp"
AVC-H264 import - frame size 320 x 240 at 25.0000 FPS
Adjusting AVC SizeLength to 16 bits
Import results: 9201 samples - Slices: 360 I 8841 P 0 B - 1 SEI - 66 IDR
AAC import - sample rate 48000 - MPEG-4 audio - 2 channels
Converting to PSP file...
Saving to C:\MP_ROOT\100ANV01\MAQ10001.psp: 0.500 secs Interleaving

[bond]

what streams did you have in the working psp file and from what file extension did you change to .mp4?

[Stay]

what streams did you have in the working psp file
I made a AVC video file using FFmpeg with the -psp option (which worked on my PSP) then i extracted the tracks using YAMB and remuxed them inputing
"C:\MP4Box_20060722\MP4Box.exe" -add "C:\MP_ROOT\100ANV01\MAQ10001_track1.h264" -add "C:\MP_ROOT\100ANV01\MAQ10001_track2.aac" "C:\MP_ROOT\100ANV01\MAQ10001.psp"
in the command prompt

and from what file extension did you change to .mp4?
I changed it from .psp to .MP4
You need to change the output filename to .psp or mp4box won't show
Converting to PSP file...
in the command prompt, which i'm assuming is it trying to add the extra info that sony (annoyingly) is required in the file.

[JoeBG]

Does anyone have tested the iTunes tagging system within MP4Box ? It seems that some tags are not setted correctly (like compilation, composer, disk, genre...). Am I right or I missed something ?

I just use the encoder option from mp4box and this works great. Did not test the other ones, sorry.

Let me resume what crazy things I do :) :

encoder tag: with mp4box, but the command "-itags" is integrated in the final muxing commandline with "-add" and "-chap". If you use -itags with a already muxed mp4, all other tags and all chapters get lost.

cover tag: with atomicparsley. If you choose mp4tags for tagging the cover, not all shell extensions will show it. And if you use atomicparsley for all other tags, the chapters get lost.

all other tags: mp4tags

[JoeBG]

I forgot some important informations:

- if I don´t use atomicparsley for the cover, the cover will not be shown in my shell extension.
- I always use the -freefree option from atomicparsley which seems to make the file more compliant
- when I use atomicparsley for other tags than the cover the chapters get lost
- when you have the intention to add the encoder tag to an already existing mp4 all other tags and the chapter informations get lost

[Kurtnoise]

if I don´t use atomicparsley for the cover, the cover will not be shown in my shell extension.
Just to be curious...what kind of shell extension did you use ?

[JoeBG]

AudioShell (http://www.softpointer.com/AudioShell.htm)

Do you know a better one? I would be glad to use a better one :)

[Kurtnoise]

iTunes ? :D

/me just kidding...

[emmel]

I'm using "neroAacEnc -he" to encode wav into aac he. The output of the encoder is a mp4, for which "MP4Box -info" reports the stream type as "MPEG-2 Audio AAC LC". Is this consistent with the "-he" setting of the encoder?

[edit] Just a small addition to describe the case in more detail:
>neroAacEnc_sse2 -he -q 0.4 -if soundtrack.wav -of soundtrack.mp4
>MP4Box -add soundtrack.mp4 all.mp4:
Isomedia import - track ID 1 - HE-AAC (SR 24000 SBR-SR 48000 - 2 channels)

>MP4Box -info all.mp4:
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000 - SBR SampleRate 48000

So, import reports the track as HE, but info says it is LC. Is this a feature? Replay works ok atm though.

[orbitlee]

I have trouble on use mp4box. I'm using MP4Box_20060731.zip to convert raw h264 video stream(about 5.4GB) to mp4. Command line is "mp4box -add video.h264 video.mp4". mp4box displays "Importing AVC-H264: |== |(1/100)", the number increase to (100/100), and then 101/100, 102/100, ... fall into an infinite loop...

Then I use binary edit tool to cut the h264 video stream into small parts(at the boundary of H264 Access UD, hex 00 00 00 01 90 ), It is very strange that every small parts can be converted to mp4 without any trouble. And, I also have plenty of free disk space.

Is it a bug of mp4box, or I missed anything? Your suggestions will be highly appreciated.

Sorry I can't post the h264 video stream since it is so huge...
Here is the mp4 info(generated from the small parts). Maybe it helps.


* Movie Info *
Timescale 600 - Duration 00:00:12.720
Fragmented File no - 1 track(s)
File Brand isom - version 1
Created: GMT Tue Aug 08 18:16:51 2006

File has root IOD
Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
Visual PL: AVC/H264 Profile (0x15)
Audio PL: No audio capability required (0xff)
No streams included in root OD

Track # 1 Info - TrackID 1 - TimeScale 25000 - Duration 00:00:12.720
Media Info: Language "Undetermined" - Type "vide" - Sub Type "avc1" - 318 sample
s
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
AVC/H264 Video - Visual Size 1920 x 1088 - Profile Main @ Level 4
Pixel Aspect Ratio 1:1 - Indicated track size 1920 x 1088
Self-synchronized



UPDATE: I found this should be a 4GB size limitation bug.
H264 video stream file with a few bytes less than 4GB is OK.
after adding one H264 access UD(so file size just exceed 4GB)
, mp4box will give ridicuous result:
Importing AVC-H264: |=====| (820710/100) ...

[Drachir]

>MP4Box -info all.mp4:
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000 - SBR SampleRate 48000


MP4Box show you the right info. HE-AAC = AAC LC (24000Hz) + SBR (24000Hz -48000Hz).

[Drachir]

UPDATE: I found this should be a 4GB size limitation bug.
H264 video stream file with a few bytes less than 4GB is OK.
after adding one H264 access UD(so file size just exceed 4GB)
, mp4box will give ridicuous result:
Importing AVC-H264: |=====| (820710/100) ...

Write a bugreport: http://sourceforge.net/tracker/?group_id=84101

[emmel]

MP4Box show you the right info. HE-AAC = AAC LC (24000Hz) + SBR (24000Hz -48000Hz).

Right. Thank you.

[emilius256]

Hi,
i have a problem with yamb/mp4box when i mux vobsub subtitles, when i play in my hardware player (irradio dvx-107 nero digital compatible) the video starts playing well, i can change audio and subtitles but after a few seconds the video stop playing.
This doesen't happen when i use nero recode files or mp4box files without subtitles.
I've extracted video, audio and subtitles from nero recode created file with yamb/mp4box and remuxed again, i have the same problem.
I use Koepi XviD-1.1.0-30122005 for video,AAC-HE 64Kbps audio encoded with belight 0.22beta_20060626, subtitles extracted with vobsub, muxed with Yamb-1.6_20060614 and Kurtnoise13 MP4Box_20060731.zip.

These are the log and command used
Yamb
[07:42:29] : YAMB 1.6.0 started !
[07:42:29] : OS type detection...
[07:42:29] : Windows XP Professional (version 5.1, Build 2600 : Service Pack 1)
[07:42:29] : Checking MP4Box location...MP4Box found.
[07:42:29] : Checking MediaInfo.dll...0.7.2.1 found.
[07:44:20] : Muxing started...
[07:44:25] : Muxing finished completely.

Output
Saving to D:\DVD-RB\Out\DVDVolume_track3_1.mp4: 0.500 secs Interleaving

MP4Box Command line
"F:\Video\YAMB\MP4Box.exe" -add "D:\DVD-RB\Out\DVDVolume_track3.cmp" -add "D:\DVD-RB\Out\DVDVolume_track4.aac" -add "D:\DVD-RB\Out\DVDVolume_track5.aac" -add "D:\DVD-RB\Out\DVDVolume_track6.idx:lang=und" -add "D:\DVD-RB\Out\DVDVolume_track7.idx:lang=und" "D:\DVD-RB\Out\DVDVolume_track3_1.mp4"

Movie info of MP4box muxed file
* Movie Info *
Timescale 600 - Duration 00:03:00.956
Fragmented File no - 5 track(s)
File Brand isom - version 1
Created: GMT Fri Aug 11 05:44:20 2006

File has root IOD
Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
Visual PL: Advanced Simple Profile @ Level 5 (0xf5)
Audio PL: AAC Profile @ Level 1 (0x28)
No streams included in root OD

Track # 1 Info - TrackID 1 - TimeScale 25000 - Duration 00:03:00.400
Media Info: Language "Undetermined" - Type "vide" - Sub Type "mp4v" - 4510 samples
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x20
MPEG-4 Visual Size 560 x 432 - Advanced Simple Profile @ Level 5
Pixel Aspect Ratio 1:1 - Indicated track size 560 x 432
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 24000 - Duration 00:03:00.309
Media Info: Language "Undetermined" - Type "soun" - Sub Type "mp4a" - 4226 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000
Synchronized on stream 1

Track # 3 Info - TrackID 3 - TimeScale 24000 - Duration 00:03:00.309
Media Info: Language "Undetermined" - Type "soun" - Sub Type "mp4a" - 4226 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000
Synchronized on stream 1

Track # 4 Info - TrackID 4 - TimeScale 90000 - Duration 00:03:00.956
Media Info: Language "Undetermined" - Type "subp" - Sub Type "mp4s" - 58 samples
MPEG-4 Config: NeroDigital Subpicture Stream - ObjectTypeIndication 0xe0
Synchronized on stream 1

Track # 5 Info - TrackID 5 - TimeScale 90000 - Duration 00:03:00.956
Media Info: Language "Undetermined" - Type "subp" - Sub Type "mp4s" - 58 samples
MPEG-4 Config: NeroDigital Subpicture Stream - ObjectTypeIndication 0xe0
Synchronized on stream 1


Movie info of Nero Digital file
* Movie Info *
Timescale 1000 - Duration 00:03:00.400
Fragmented File no - 7 track(s)
File Brand mp41 - version 0
Created: GMT Wed Jul 26 06:15:58 2006

File has root IOD
Scene PL 0x01 - Graphics PL 0xfe - OD PL 0xfe
Visual PL: Advanced Simple Profile @ Level 5 (0xf5)
Audio PL: Scalable Audio Profile @ Level 1 (0x05)

Chapters:
Chapter #1 - 00:00:00.000 - "Capitolo 1"

Track # 1 Info - TrackID 1 - TimeScale 1000 - Duration 00:00:00.001
Track is present in Root OD
Media Info: Language "English" - Type "odsm" - Sub Type "mp4s" - 1 samples
MPEG-4 Config: ObjectDescriptor Stream - ObjectTypeIndication 0x01
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 1000 - Duration 00:00:00.001
Track is present in Root OD
Media Info: Language "English" - Type "sdsm" - Sub Type "mp4s" - 1 samples
MPEG-4 Config: SceneDescription Stream - ObjectTypeIndication 0x01
BIFS Scene description - Command stream
Synchronized on stream 1

Track # 3 Info - TrackID 3 - TimeScale 25000 - Duration 00:03:00.400
Media Info: Language "English" - Type "vide" - Sub Type "mp4v" - 4510 samples
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x20
MPEG-4 Visual Size 560 x 432 - Advanced Simple Profile @ Level 5
Pixel Aspect Ratio 1:1 - Indicated track size 560 x 432
Synchronized on stream 1

Track # 4 Info - TrackID 4 - TimeScale 24000 - Duration 00:03:00.309
Media Info: Language "Italian" - Type "soun" - Sub Type "mp4a" - 4226 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000 - SBR SampleRate 48000
Synchronized on stream 1

Track # 5 Info - TrackID 5 - TimeScale 24000 - Duration 00:03:00.309
Media Info: Language "English" - Type "soun" - Sub Type "mp4a" - 4226 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000 - SBR SampleRate 48000
Synchronized on stream 1

Track # 6 Info - TrackID 6 - TimeScale 90000 - Duration 00:02:59.000
Media Info: Language "Italian" - Type "subp" - Sub Type "mp4s" - 59 samples
MPEG-4 Config: NeroDigital Subpicture Stream - ObjectTypeIndication 0xe0
Synchronized on stream 1

Track # 7 Info - TrackID 7 - TimeScale 90000 - Duration 00:02:59.000
Media Info: Language "English" - Type "subp" - Sub Type "mp4s" - 59 samples
MPEG-4 Config: NeroDigital Subpicture Stream - ObjectTypeIndication 0xe0
Synchronized on stream 1


Anybody know how to solve the problem ?

Thank you

[lebanni]

Hi,
Any news for the problem with the ' character ?
I also have the issue of test disappearing after #apos code in ttxt subtitles while playing. I have bob0r's ffdshow-2546-gcc4.0.3-sse-x264.nl.exe, latest haali splitter, played with MPC 6.4.9.0 rev911. I tried both MPC internal and ffdshow subtitles handling. I have also tried vlc 0.8.5.
I use ttxt file directly generated from SubRip 1.50 beta3a, saved in unicode and muxed in .mp4 with latest mp4box from MeGUI auto-update.

Le Banni.

[Kurtnoise]

Any news for the problem with the ' character ?
Nope...but someone has already made a bugreport.

[lebanni]

Nope...but someone has already made a bugreport.
Thanks. I hope this will be soon fixed.

[chelala]

Hi I've read about mp4box can mux subs compatible with nero, I also read nero subs are vobsubs. Also read about taking srt and obtaining idx/sub

Can someone guide me to just (if possible using MeGUI) have a movie and srt (say avi, srt) and obtain a mp4 movie muxed with AVC, AAC, and nero compatible sub (s) ??

Playable with nero showtime and also with haali splitter/directvobsub/ffdshow. In the say way nero recode 2 produces and work.

thanks in advance

harold chelala

[Kurtnoise]

Well...srt to idx/sub is not possible through MP4Box. You need to use some other tools to do that. Check out Subtitles Stickies & Section.

Plus, Haali splitter doesn't work properly with vobsub streams embedded in mp4. You need to use the MP4 Splitter from Gabest instead.

[Kurtnoise]

I hope this will be soon fixed.
I'm just checking the code about this issue and I found why...TTXT uses the ' as special character to delimit each lines of text. So, when you have a word with the ', the parsers read this as an end of line. That's why we can have the fisrt part in the first line and the second part in a new line and so on...

I've made a workaround (http://kurtnoise.free.fr/index.php?dir=mp4tools/&file=MP4Box-0.4.3_20060824.zip) to resolve this but there's still a problem : no carriage return anymore with multilines. :o i.e parsers will read multilines as a whole line.

I know this is a hack but it's better than nothing after all...:p

[Sharktooth]

cant the ' character be replaced by something different? like a ^ or # ?

[Kurtnoise]

Sure but this implies to update parsers/readers filters. and I don't have the skills to do that personally...

Anyway, ^ and # can't be used.

[Sharktooth]

whatever... mine was an example...

[CruNcher]

I have a big big problem with Captured Sat H.264 (Tandberg) Streams muxed with mp4box these don't playback with CyberLinks Decoder but with every other i fixed the startcode and everything but that doesn't fix it, other Decoders don't have those problems but the best of all the pure bitstream playbacks fine with Cyberlinks Decoder (3 or 4byte startcode) :(

Edit: useing mp4creator no such playback problems with both startcodes so i assume mp4box is once again b0rked or Haali and Gabest Mp4 Splitter are, wich i can't belive as other Decoders playback with them (what seem to be borked mp4box muxed files)
oh how i hate such interoperability problems :(

[Drachir]

Edit: useing mp4creator no such playback problems with both startcodes so i assume mp4box is once again b0rked or Haali and Gabest Mp4 Splitter are, wich i can't belive as other Decoders playback with them (what seem to be borked mp4box muxed files)
oh how i hate such interoperability problems :(

Maybe you should post at the GPAC forum and provide a sample(source) stream?
Playback of other player/decoder doesn't say much, the file can still be borked. But however I would post at the GPAC forum, if you want get an answer.