I captured directly to MPEG-2 using MainConcept capture software's NTSC MPEG-2 setting and the resulting file, when analyzed with PVAStrumento, gives me the following information.

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VIDEO: Resolution 720 x 480
Aspect ratio is 4:3
Frame rate 29.97 fps
Nominal bitrate 6000000 bps
first PTS: 00:00:00.213

AUDIO: MPEG-1, Layer 2
32.0 kHz, Stereo
Bitrate 384 kbps
Frame Length 36.0 ms (1728 bytes)
first PTS: 00:00:00.213

No A/V delay. Go celebrate !

==SCANNING==

Funny. Video and Audio start synchronously.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:00:19.953
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:00:39.472
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:01:17.510
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:01:40.533
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:01:58.551
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:02:43.096
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:04:41.214
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:05:22.255
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:05:28.761
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:06:21.814
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:07:39.392
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:07:49.902
Syncing: Cutting audio.
ALERT> Temporal structure wrong in GOP - dropping
ALERT> 14 video frames missing at 00:09:29.001
Syncing: Cutting audio.
Done.

Video bitrate: max 6481 , avg 3985 kbps

Video: 17376 pics 00:09:39.779
Audio: 16114 frames 00:09:40.104

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I don't get these kinds of errors doing capture other ways (MPEG-2 hardware capture, Ulead DVD MF capture), and playback on my TV looks fine. What do these messages mean and how significant are they?

TIA