Dealing with errors in m2t file in Vegas

[mdw]

Hello,

I have a video shot with HV20, captured with HDVSplit. At one point there's a glitch -- possibly a dropout. My issue is, that there is about 20 minutes gap in audio -- from the glitch point -- when I import the file into Vegas.
What am I to do? When I demux the .m2t file in ProjectX, I get mp2 audio file, that Vegas loads fine and there's no gap. The problem is, that Vegas doesn't seem to be able to load the other part -- the m2v file (MPEG-2 elementary stream). So, at the moment I am stuck. Any hints how to deal with this situation are appreciated.

-mdw

[Eugenia Loli-Queru]

Re-capture the tape, use HDVSplit this time. Don't try to demux and do ugly stuff. Just try to capture again. And buy newer tapes.

[mdw]

I solved the issue by demuxing in ProjectX (which corrects errors and resyncs audio) and then remux it in tsMuxer into transport stream. The result was corrected file that loaded fine in Vegas.

-mdw

[Eugenia Loli-Queru]

Yeah, well, I just don't see why you have to do this at all. You should find out what's wrong and fix it.

[mdw]

Yeah, well, I just don't see why you have to do this at all. You should find out what's wrong and fix it.

That's a good idea, but it does not work for footage you already have (no, recapturing did not change anything). Anyway, my HV20 does occasional dropouts from time to time (and it has always been that way).

-mdw

[Eugenia Loli-Queru]

Mine never had a single dropout. Change your cable.

[Bob Sanders]

I like HDVsplit, but I have noticed that there are some bad scene splits and other problems that show up on the Vegas time line if you scene split on the fly.

HDVsplit DOES give you the option of splitting a complete file on the HDD..... which is what I do. Capture the WHOLE file as one to the HDD....(with preview off).... THEN use the scene split option (with audio/video sync off).

A LOT of the crashing and other problems I was having in Vegas just don't exist anymore since I have used this method.

[zigip]

I have been captuing using hdvsplit, and i get occasional audio dropouts in the middle of a scene; the audio just stops for up to several minutes then starts up again.

Its not the cable or old tape. I can open the .m2t file in vlc and the audio is there.

Its just not there with vegas 9.

Any suggestions?

[Bob Sanders]

Interesting.

There is another person that has the same problem Vegas pro. It's not exactly the same thing and I think he narrowed it down to a HDD problem, but still you may get some pointers out of it.

http://www.avsforum.com/avs-vb/showt...ighlight=vegas

[bigjezza]

Well, if it works everywhere but Vegas, I'd say Vegas is a bit borked. Demux the file, and see if you can import the audio separately. DGIndex will do the trick.

1) Visit http://neuron2.net/dgmpgdec/dgmpgdec.html and download 1.5.3.
2) Extract the file somewhere, like c:\dg\
3) Run the program, choose file, open, and select your M2T, ok etc.
4) Click Audio, Output method, and make sure it is set to Demux All Tracks
5) Choose File, Save Project, and choose a spot for the Audio to end up.
6) Import the original M2T into Vegas, dodgy audio and all. Then delete the dodgy audio track in Vegas. Import the demuxed track from step 5 into a new track.

Is the audio fine like that?

[zigip]

That is exactly what i did, but used vlc to extract the audio; then replaced the vegas audio with the vlc audio

I believe it is due to tape drop out though; this gets back to how many times can you use a tape.

[racer-x]

I believe it is due to tape drop out though; this gets back to how many times can you use a tape.

I get on average about 10 re-uses per tape before I experience dropouts and/or other problems.

It's important to note that unlike mini-dv that uses all I-frames, HDV uses a 15 frame GOP. That's one I-frame to every 15 frames. If you get a dropped frame, it may take up to 14 frames before Vegas can recover. That's assuming no other dropped frames in the process........

[MDinDestin]

I have the same problem. I captured a portion of a brand new tape. There were five dropped frames during the process and I had used HDVSplit.

It's not just Vegas. Windows Movie Maker also choked on the m2t file and froze up.

[Krane]

I believe it is due to tape drop out though;

The most likely culprit

this gets back to how many times can you use a tape.

Which is like saying how long can you drive on the same tires. Although with tires there is a mileage rating; and the supposition is that you drive perfectly on perfect roads.

As for tape, it's a good bit of trial and error. But I hesitate to include tape quality lest the league of "all tapes are the same" descent down on me. Still, I knock on wood.

[Janke]

brand new tape. There were five dropped frames

Tried a cleaning tape?

[Lou van Wijhe]

Tried a cleaning tape?

That's exactly what I was thinking. I film a lot and on my HV20 I never had a single dropped frame. But I use a cleaning tape after 10 video tapes or so. I don't know if this plays a role but I always capture in Vegas, not HDVSplit.

Lou

[MDinDestin]

It ended up being the firewire cable. Now I'm back at it with Vegas MSP 9. I've googled myself silly and can't get good results from a default recording with new tapes on an HV30. My mov files from a T2i using WMM are stunning but these m2t files look awful.

I'm having a hard time accepting that it's beyond my ability and google skills to find THE best settings for making a video in 9.

I just want the highest quality I can get for two instances: Vimeo and also a DVD. I'd pay money for a video showing all the settings before editing and then rendering. What complicates it is the need to mix MOVs with M2Ts.

I'll gladly move to Vegas Pro 11 and or Cineform if it will help.

[ejolson]

What complicates it is the need to mix MOVs with M2Ts.

Is it possible the .mov's are using full swing and the .m2t's are using studio swing levels? This would make these clips them difficult to mix in Sony MSP 9 which only has an 8-bit video rendering path and doesn't automatically convert the levels. I would recommend using avisynth or posssibly cineform to transcode your files so they all have the same swing levels before mixing them on the timeline. Alternatively, you may explicitly add the studio->computer effect for the .m2t tracks.