I just downloaded a number of various copies of different source material for a popular comedy central cartoon. sizes range from 87mb to 1GB and source material is HDTV, DVD and bluray. All use the same codec h264 and audio is very close to the same bitrate, not really an big issue in size comparison. The thing is that the best quality is the DVD rip at about 120mb. I've found that a lot of video's I've found have looked better at 700-800MB vs some files that are 2-3.5GB in size (and these usually use the same codec). I've done compression before and never had any results where the quality looks so bad at the larger file size that I see in some of these files (like the 2 - 3.5gb). Is there any reason that some of these files often look so bad? I've heard of some people hiding files within pictures and videos and was wondering if there is any way to determine if this has happened in any of these files.