Pixelated cuts with MPEG Editor

[ferper]

I taped two TV shows with Daewoo DW-R622 AA at EP speed (2 hour setting) and then I ripped the DVD into my computer using DVD Decrypter. So far so good, but then I loaded TMPGENC MPEG Editor to edit the commercials and at the cut parts the program show 3 or 4 pixelated frames.

I don't know why this is happening, maybe a setting or something like that. But I tried before with another DVD recorder and didn't have these problems.

Any ideas?

[edDV]

NTSC MPeg2 has 15 frame GOPS with a complete I frame every 15 frames (1/2 second) and change data P and B frames after that. If you cut between the I frames, new intermediate frames need to be estimated. Your program is doing a poor job estimating probably because the signal is noisy.

http://en.wikipedia.org/wiki/MPEG-2

[jagabo]

Your program is doing a poor job estimating probably because the signal is noisy.

So set it to a higher bitrate. That will only effect the cut GOPs that have to be reencoded.

[tomlee59]

Increasing the bitrate may not help much; it seems more likely that his s/w just doesn't do estimation pretty well. But it's worth an experiment, certainly.

If that doesn't produce reasonable results, another possible workaround is to cut only at I-frame boundaries. The does limit the time-granularity of edits, but for cutting out commercials and such, it's often good enough.

[vhelp]

This could also be dvd recorder related. You said that you tried it in another dvd recorder. So that tells me that its a hardware MPEG chipset things, and prob related to the recording quality setting, as in your SP vs. EP recording. I'm also thinking that it was also related to the amount of bitrate defined for that EP mode recording. Could be a combination of those things. But its not uncommon for this to accur under these extream conditions when using EP mode recordings with dvd recorders.

However, try this.. next time set your dvd recorder to record in CBR and see if that still happens.

-vhelp 4787

[jagabo]

Increasing the bitrate may not help much; it seems more likely that his s/w just doesn't do estimation pretty well.

TMPGENC MPEG Editor's MPEG encoder is decent. It won't have problems like that if set up properly.

[ferper]

Thank you for the replies. I taped at SP (2 hour), not EP, I mistyped it.
About the "I frames", is there a way to know when I am at a "I frame boundary" so I can make the cut?
And probably is an issue with the DVD recorder. It's a cheap one but I had no troubles with another brand so I gave it a shot...

I will try to make the cuts at different points to see if that helps.

[tomlee59]

For simple cuts and splices, I use MPEGstreamclip. It has a handy "go to next keyframe" option in one of the menus (edit menu? If not, it's easy to find...). ["Keyframe" is just a synonym for "I-frame"]

[jman98]

I strongly recommend either VideoReDo or MPEGVCR instead of any version of TMPGenc or free MPEG editors. Both are "try before you buy" so it costs nothing to see if they solve your problem.