Glitch on tv, not computer

[dynamique]

Hi!
After having enoded 16:9 dv material with first Adobe Encore 2.0 and then TMPGEnc 4.0 Xpress, I noticed that a glitch appeared at exactly the same place in the finished movie: in a fade-out of a text graphic 4 seconds into the movie.
The strange thing is that the dv source looks fine at that point, and also the preview on the computer (using preview in the programs or VLC), but when I watch it on the tv, the glitch appears.
Is the beginning of an encoded material more susceptible to glitches, due to GOP structure? I think I have seen more glitches in the first ten seconds of my encoded materials.
Any standard solution?
Thanks

[guns1inger]

Fades are susceptible because they require a high bitrate to maintain smoothness. This goes for cross fades and fades to black or white. Why ? Because every pixel changes in every frame. The compression in mpeg works best when there is minimal change between frames, as it works on building from data in previous or next images. When the entire image changes every frame it cannot do this, and becomes very inefficient. This might not be as noticeable on the PC simply because of the darker gamma, but will show up on your TV as either blockiness or popping.

If you are encoding with a constant bitrate on the low side, try switching to variable bitrate instead.

[dynamique]

I use VBR. Can I force I-frames into the fades in TMPGEnc Xpress?
Thanks for teaching me, I learn and learn

[guns1inger]

I don't use Tmpgenc Xpress, but I suspect that it does not give you that level of control.

[dynamique]

I found the problem! It had nothing to do with the encoding. It was a frame - one, single frame - in the avi file that was wrong. It didn't show up when playing the dv file in real-time, only when stepping forward frame by frame in the NLE. In one computer screen (using two different computers) it didn't even show on the computer, only on the connected tv monitor (normal tv). Maybe it was just one field (don't know enough about fields to say). Somehow it was there, and when I removed it, it disappeared also from the dvd. Strange thing is, it was much clearer and disturbing when seen on a tv encoded as an mpge2.
Thanks anyway

TmpgEnc Xpress can force I-frames. But it can only handle every four frames, I can't choose ecaxtly which frame to go to. I don't know why.