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| dan2304k |
| Posted: Jan 26 2003, 05:13 AM |
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Probably need to play a 2 channel downmix during editing, but then just pass through the raw untouched ac3 frames when actually writing the AVI.
Alternatively a file->save ac3 would work just as well (for my purposes).
But yes, when I have an ac3 AVI, virtualdub can edit but can't play the audio. I usually select "no audio" while i'm working on the file and then switch it back to "direct stream copy" when I'm ready to save.
Thanks for considering my idea... working with HDTV is difficult at this point since it's such a new medium. |
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| atavist |
| Posted: Jan 28 2003, 12:04 AM |
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| QUOTE (dan2304k @ Jan 25 2003, 09:49 PM) | This is great work guys, but I would like to be able to to a *real* direct stream copy on ac3 audio. I'm working with HDTV mpeg2 source, eventually making DVDs. Since I'm going to DVD, I don't want a two channel downmix, I really want to be able to get the original ac3 audio.
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Along the same lines, it would be useful to skip the step of converting the HDTV MPEG-2 source to an AVI for editing. How hard would it be to enable a direct stream copy of the MPEG-2 video, i.e., open the MPEG-2 source, edit cutting only on I-frames so you don't have to deal with re-encoding any frames, and then save the output back to an MPEG-2 program stream, rather than converting to AVI?
Even with HuffYUV, these intermediary AVIs are *large*.
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| fccHandler |
| Posted: Jan 28 2003, 12:56 AM |
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| QUOTE (atavist @ Jan 27 2003, 08:04 PM) | | How hard would it be ... ? |
I think very.
It sounds to me like you HDTV guys are just looking for a simple way to edit your MPEG-2 streams losslessly. IMHO VirtualDub is not at all suited for this, and I think it would be far better to write a dedicated utility to edit MPEG without re-encoding. I was going to suggest TMPGEnc's cut/join tool, but then I seemed to remember it chokes on MPEG-2 input.
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May the FOURCC be with you... |
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| ChristianHJW |
| Posted: Jan 28 2003, 04:07 PM |
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| QUOTE (fccHandler @ Jan 28 2003, 02:56 AM) | | I was going to suggest TMPGEnc's cut/join tool, but then I seemed to remember it chokes on MPEG-2 input. |
TMPEG's 'MPEG Tools' work fine on MPEG2 streams, however i dont find it half as convenient to use as vdub on AVIs.
I know some people here were questioning the sense of putting MPEG video streams into matroska files, but beleive me guys, MPEG container was not defined for editing at all, while this is matroska's biggest advantage.
As always, people are a little bit smiling about the 'hype' i make about matroska and the possibilities it will give us, being an open standard and very extensible with excellent backwards compatibility thanks to its EBML nature.
In the end, and i am 100% convinced about this, nobody will smile about it anymore once the first tools will be relased and people will start realizing what we can do with it ....
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Visit the unofficial Virtualdub support forum on http://forums.virtualdub.org - help to reduce the big number of emails Avery Lee is getting every day !!
Support matroska as container and Gstreamer as the only truely open, x-platform multimedia platform .... |
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| fccHandler |
| Posted: Jan 29 2003, 05:42 AM |
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| QUOTE (ChristianHJW @ Jan 28 2003, 12:07 PM) | | TMPEG's 'MPEG Tools' work fine on MPEG2 streams |
I have not had that experience at all, but I think it uses DirectShow, so it probably depends on what MPEG-2 filters you have installed.
| QUOTE (ChristianHJW @ Jan 28 2003, 12:07 PM) | | I know some people here were questioning the sense of putting MPEG video streams into matroska files, but beleive me guys, MPEG container was not defined for editing at all, while this is matroska's biggest advantage. |
Those "some people" include me, but it's not the "sense" that I'm questioning. Really I'm just doubting that it's possible to encapsulate MPEG content (with P and especially B frames) in a system that can be edited.
| QUOTE (ChristianHJW @ Jan 28 2003, 12:07 PM) | | As always, people are a little bit smiling about the 'hype' i make about matroska ... In the end, and i am 100% convinced about this, nobody will smile about it anymore .... |
I will smile if matroska succeeds, because I'll be so happy for you mate! 
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May the FOURCC be with you... |
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| ChristianHJW |
| Posted: Jan 29 2003, 06:53 AM |
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| QUOTE (fcchandler @ Jan 29 2003,) |
I have not had that experience at all, but I think it uses DirectShow, so it probably depends on what MPEG-2 filters you have installed. |
TMPEG is using DShow only for AVI import. The MPEG tools to cut/merge are not based on it.
| QUOTE | | Really I'm just doubting that it's possible to encapsulate MPEG content (with P and especially B frames) in a system that can be edited. |
matroska can handle all known frame types natively, and without needing 'dummy' frames as placeholders. frame order is encoding order (makes sense ).
And yes, i will smile too  !!
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Visit the unofficial Virtualdub support forum on http://forums.virtualdub.org - help to reduce the big number of emails Avery Lee is getting every day !!
Support matroska as container and Gstreamer as the only truely open, x-platform multimedia platform .... |
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| fccHandler |
| Posted: Feb 22 2003, 08:28 AM |
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 8955 people have viewed this topic???
(Must be a new world's record!)
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May the FOURCC be with you... |
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| jcsston |
| Posted: Feb 22 2003, 09:05 AM |
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Matroska Dev
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| QUOTE (fccHandler @ Feb 22 2003, 02:28 AM) | 8955 people have viewed this topic???
(Must be a new world's record!) |
It's a great upgrade
8970 views compared to 3309 is no contest 
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Use the Matroska file format |
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