NPVR 2.5.5 craches due to artifacts in HD recording // Tool for cutting *.ts files

[fjbpchristiaens]

Hi,

Recently I repeatedly encountered the issue that NPVR hangs-up while playing a recording from an HDTV (German) channel. The rest of the recording seems to be ok (if I jump over this particular point, the rest of the movie plays without any problem). The log-file shows absolutely nothing.

If I replay with another player, I can see that on the particular point where NPVR hangs up, some digital artifacts occurs (probably some noise on the cable or an issue with the writing of the file) after which the play-back resumes normally. As I understand this discription is a bit thin, I tried to isolate the "issue" part of the recording with a ts file cutter to obtain a much smaller file, but the result always seems to get re-coded: if I replay it in NPVR, I now see the artifacts as well in NPVR but NPVR continues the play-back (so no hang-up).

My question: does anybody knows a free-ware software to cut ts file without touching their contents/recoding?

Thanks in advance,
Frederic

[sub]

It's pretty manual, and will require you to do a few cuts, but you can use cutchunk to extract a portion of ts file without changing the contents.

[mvallevand]

If you know the time frames to skip, the easiest thing to do is create an edl file and NextPVR will automatically skip over the bad areas. I use another utility to highlight the regions of the file were the ts packet continuity numbers get out of wack.

Martin

[fjbpchristiaens]

Hi Sub,

tried with cutchunk, but I would need am initial size of about 2000MB in order to further to narrow down to the chunk with the artifacts/freeze (the original file is about 9GB; 500MB per 5 min). The cutchunk tool seems to have a limit of 1000MB. Is there any way to circumvent this limit and go to 2000MB?

thanks,
Fred

[sub]

Unfortunately I no longer have the source code to cutchunk one machine, so I'm not able to easily modify it.

I probably still have it on an old hard drive somewhere, but it might take me some time to be able to retrieve it.

[fjbpchristiaens]

Thanks, no hurries. If you would be able to find back a copy, I could post just a chunk that causes the freeze

[raceviper13]

http://www-personal.umich.edu/~balazer/HDTVtoMPEG2

http://www-personal.umich.edu/~balazer/H....11.94.zip

I linked to the file directly because the page redirects quickly to an error page for some reason. Anyway, it works for me!

Unfortunately if you're transcoding the file after cutting, it will need to have the audio re-sync'd afterwards. It doesn't affect playback of the cut file.

[fjbpchristiaens]

I'll give it a try during the WE, thing is I don't want to re/transcode,the files are about 9GB so I prefer if I jump over the point where NPVR freezes, I can watch the rest of the video perfectly.

It just happened already a couple of times, that these artifacts make NPVR freeze where other players just show some cluttering on the image but continue... So ideally I'd like to cut out this sequence so I could post it on the board, maybe NPVR could be change to handle those recording imperfections...

[sub]

Have you tried other decoders? Some behave very differently in their behaviour of broken data. Some only deliver full frames. Some will try rendering the data, giving your partial frames and a bit of garbage. Some lockup, some dont.

[Reddwarf]

I'll give it a try during the WE, thing is I don't want to re/transcode,the files are about 9GB so I prefer if I jump over the point where NPVR freezes, I can watch the rest of the video perfectly.

It just happened already a couple of times, that these artifacts make NPVR freeze where other players just show some cluttering on the image but continue... So ideally I'd like to cut out this sequence so I could post it on the board, maybe NPVR could be change to handle those recording imperfections...

I'v experienced that some decoders are proun to freeze due to errors in the video stream while others are more resistent. I'm currently using Cyberlink PDVD12 which seems to handle most errors. I think the worst I'v seen is the LAV video decoder (of those that works anyway).