how to fix "broken" tystreams?

[FredThompson]

I've seen two types of "broken" tystreams and am looking for ways to fix them. Would appreciate any help.

1) Streams where the timing appears to reset to 0 inside the stream. This makes GOPEditor's output useless. IOW, there are multiple places where a time offset of 0 appears. These streams have what looks like MPEG corruption part way through. While using GOPEditor, there will be an I-frame or 2 with horizontal elements from another frame, sort of a Venetian blind effect. After that, the time offsets are reset.

2) One stream works fine with GOPEditor and crashes as soon as an attempt is made to multiplex. The only cut is the last part. There must be something odd right at the very beginning of the stream.

I seem to recall a post by jdiner which mentioned some form of stream scanner/fixer wrt timing (perhaps?) and cannot seem to locate it. Was that a hallucination?

[jdiner]

Originally posted by FredThompson
I've seen two types of "broken" tystreams and am looking for ways to fix them. Would appreciate any help.

1) Streams where the timing appears to reset to 0 inside the stream. This makes GOPEditor's output useless. IOW, there are multiple places where a time offset of 0 appears. These streams have what looks like MPEG corruption part way through. While using GOPEditor, there will be an I-frame or 2 with horizontal elements from another frame, sort of a Venetian blind effect. After that, the time offsets are reset.

2) One stream works fine with GOPEditor and crashes as soon as an attempt is made to multiplex. The only cut is the last part. There must be something odd right at the very beginning of the stream.

I seem to recall a post by jdiner which mentioned some form of stream scanner/fixer wrt timing (perhaps?) and cannot seem to locate it. Was that a hallucination?
That fixer is in TyTool/vsplit. Where do you guys get streams that reset more than twice. It would require a single TyStream to be more than 4 1/2 hours long. I have asked and asked people for one that does that so I can test and fix things. But I have yet to get one. Without one that showcases the problem I can't do jack about the problem.

As for bad rendering when the second reset occurs that is because it doesn't expect any resets and potentially finds multiple frames at the same timestamp and tries to render both.

--jdiner

[FredThompson]

Where do I get it? From my T60 :P

If you want, I'll send you the .ty files, one for each problem.

I suspect the time-reset streams were recorded while that last hurricane was passing by. Reception was goofy for a few days. The skies were completely clear here but who knows what was happening between me and the feed?

My resetting streams are only doing it once, at about the 60 minute point.

PM me if you'd like me to mail you a DVDR with these. Can you use + media? My burner came with one and all I use is - so using it for a shuttle for you seems a good idea.

I'll make copies and try the fix routine. Thanks for your reply.

[jdiner]

Yeah I can use +r media. Feel free to get it ready and then ship it to me. I will PM you with the address.

--jdiner

[jdiner]

Wait it only reset's once and that is what you were talking about? I thought you said on the second reset it was getting off.

GopEditor does work with these but only after about version 7r6. You must remake the key file if you made it with an older version. If it really does not work with everything done brand new again then please send it on to me.

There might be something else going on. If it resets in the middle of real show and not a commercial or some such then there is nothing to be done about any visual/audio distortion. When a reset takes place there is most definately lost audio and video data. I have gone over a number of them and they are all missing something one was missing almost 2 seconds of video and one was missing only a few frames there is still a gap.

--jdiner

[FredThompson]

Looking at what I typed, I now see it was not as accurate as possible. Yes, the timing resets to 0 during a commercial block and this happens once.

I'm running 7r10 and still have problems with the streams.

Will burn a disc for you. Please PM me with an address to which I should ship.

[FredThompson]

Josh,

How is vsplit used to fix tystreams? Another one of these problem files has shown up. It's about 30 minutes on the TiVo, only the first 16 make it to the key file. I've tried a few things with vsplit but a proper keyfile still isn't being made. Multiplexing without an edit file results in an abbreviated mpeg.