Thanks for the tip, I have used the web admin, and see how it works. I tried the -async, max_video_br=12000k and max_audio_br=384k as suggested. But there is no change. I doubled checked by recording a couple of 2 minute videos of a news program, again tried I to play them via PyTivo but they have the same "stuttering" problem. I believe the PC video files are good. I then tried VideoReDo on them. I tried the Quickstream fix with but it found no errors and there is no improvement. I then tried doing "set start" and "set end" - "add selection" - "save as" with the options all set at "no change". However, the original file shrank from 3.2gb to 1.5gb. But lo and behold the Pytivo transfer now plays fine. But when I check the original versus "save as" files I see the following changes. Original = MPEG2 video, 1280x720 59.94fps 13894kbps, audio Dolby AC3 48000hz 5.1ch 448 kbps filesize 3.1gb Save as = MPEG2 video, 1280x720 59.94fps 13160kbps, audio Dolby AC3 48000hz 1ch 192 kbps filesize 1.5gb So it seems that the VideoReDo "no change" does change things - especially the sound channel. But it now works. So the new question. Can ffmpeg_mp2.exe handle 5.1 surround sound? Could this be the problem?