Is it the media or the contents?

I burnt a Verbatim DVD which suffered from slight pixellation at the start and near the end. So I burnt the same data onto another Verabtim from the same spindle and got similar results. I then checked a previous Verbatim disc that I knew was Ok and was from the same batch, the results of the scans are below, any ideas what’s going on here?

First Scan

Second Scan (same content as First Scan)

Third Scan (this was the DVD that was OK)

Was this movie compressed? If so, the problem might be that it was over-compressed, or poorly compressed.

According to the author it was untouched, although I’m doubtful as it was just over 2 hours long.