phozz
30th May 2004, 20:35
Hi,
Occasionally I download a home-authored DVD, converted from an interlaced VHS source, that has a problem: It looks just fine when played on software players, but when played on a hardware player and a TV the field order appears reversed - and therefore motion appears horribly jerky! However, when the camera is still there are no problems (there is no visible reversing of horizontal lines nor a vertical jerkiness).
Here are further clues that may help in understanding the phenomenon:
The DVDs I refer to are NTSC. However this only occurs with some discs (most interlaced DVDs are perfect).
I have tested this with two different standalone systems, with all equipment natively NTSC compatible (I am in a PAL country but most equipment sold here is fully multisystem). Same results both times.
The problem does not seem to occur to all people who download the same DVDs, because I've never seen any complaints. I don't do any re-authoring, I download and burn so this can't be entirely my fault.
The problem is not sporadic but rather seems to come from one person using a specific hw/sw combination. However it's hard to complain to him, as apparently he doesn't see the problem.
The DVD was made like this: VHS >Hauppauge WinTV card with hacked conexant bt828 drivers>ULead Video Studio capture at DVD setting, constant bitrate of 8000, 720X480 and audio at 48kHZ>Sony Vegas 4.0 for editing and rendered down to 6500 constant bitrate>DVD Architect authoring>disc
So.. If anyone knows (a) why this happens, (b) how can I repair this problem at my end (hopefully without having to re-encode the video) and (c) what can I tell the releaser to prevent this problem in the future?
Thanks in advance!
Occasionally I download a home-authored DVD, converted from an interlaced VHS source, that has a problem: It looks just fine when played on software players, but when played on a hardware player and a TV the field order appears reversed - and therefore motion appears horribly jerky! However, when the camera is still there are no problems (there is no visible reversing of horizontal lines nor a vertical jerkiness).
Here are further clues that may help in understanding the phenomenon:
The DVDs I refer to are NTSC. However this only occurs with some discs (most interlaced DVDs are perfect).
I have tested this with two different standalone systems, with all equipment natively NTSC compatible (I am in a PAL country but most equipment sold here is fully multisystem). Same results both times.
The problem does not seem to occur to all people who download the same DVDs, because I've never seen any complaints. I don't do any re-authoring, I download and burn so this can't be entirely my fault.
The problem is not sporadic but rather seems to come from one person using a specific hw/sw combination. However it's hard to complain to him, as apparently he doesn't see the problem.
The DVD was made like this: VHS >Hauppauge WinTV card with hacked conexant bt828 drivers>ULead Video Studio capture at DVD setting, constant bitrate of 8000, 720X480 and audio at 48kHZ>Sony Vegas 4.0 for editing and rendered down to 6500 constant bitrate>DVD Architect authoring>disc
So.. If anyone knows (a) why this happens, (b) how can I repair this problem at my end (hopefully without having to re-encode the video) and (c) what can I tell the releaser to prevent this problem in the future?
Thanks in advance!