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Joined: Tue Jun 27, 2006 1:12 pm
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Post Posted: Tue Jun 27, 2006 1:22 pm 
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How to unwrap single essences from a system MPEG1 file?
Is there a free tool?

I want to embed this MPEG1 file in an MXF wrapper, with some metadata.

But before I need to get the essences from it.

Thanks,
Camillo

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Joined: Thu Apr 15, 2004 10:39 am
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Location: Scotland

Post Posted: Wed Jun 28, 2006 9:51 am 
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You will need a tool like DGMPGDec

Note that when you try and wrap an MPEG1 video stream you will get some warnings as not all the required matadata is present in the stream so a few assumptions are made.

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Post Posted: Thu Jul 06, 2006 8:42 am 
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I used "dgmpgdec" and produced 3 files:
- a video essence (.m2v) file which is a good essence!
- an audio essence (.mpa) file which is NOT a good essence!
- a "d2v" file which I dont know what it is...

"mxfgui" tells me that the ".mpa" file is not a good essence... why is it not recognized from the MXF wrapper as a good essence???

Thanks,
Camillo

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Post Posted: Mon Jul 10, 2006 4:47 pm 
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MXFLib does not currently support MPEG audio.

Unfortunately, as with many Open Source projects, features are added when funding is available for that specific task. No one has yet funded MPEG audio (probably because most professional applications use uncompressed audio).

I would recommend converting the .mpa file to wave format.

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Post Posted: Mon Jul 10, 2006 5:04 pm 
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Ok! I have done the conversion using "BeSweet" application.

Now I have 2 essences:
- M2V
- WAV

The MXF created using freeMXF "mxfgui.exe" crashes WMP with:
- Snell&Wilcox MXFDesktop installed (player plugin)
- Elecard MPEG2 decoder ver.3.3.6

The MXF created using Snell&Wilcox MXFWrap instead is played correctly!

Do you want me to send you the files??? (70MB each)

Thanks,
Camillo

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Joined: Tue Jul 11, 2006 8:49 am
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Location: Barcelona, Spain

Post Posted: Tue Jul 11, 2006 9:04 am 
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Hi group!

I've also noticed some incompatibilities between S&W express dektop and mxflib generated files.

Note that since it is the S&W software who is providing the DirectShow filters to play mxf files out, Moonlight's player (and any other DS based player) will fail or succeed depending on S&W ability to parse a given file.

I've succeeded to write compatible files, though some changes in the code are needed. If still interested, drop me a mail and I'll give you some hints.

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Post Posted: Tue Jul 11, 2006 10:01 am 
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camillo wrote:
...
Do you want me to send you the files??? (70MB each)


Can you put them somewhere FTP-able? I think 70MB in one file may break my e-mail.

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Post Posted: Tue Jul 11, 2006 10:03 am 
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amartens wrote:
I've succeeded to write compatible files, though some changes in the code are needed. If still interested, drop me a mail and I'll give you some hints.

Can you PM or e-mail me the details so they can be included in the next release.

Thanks.

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