interlaced or progressive

[maxwell3]

Can someone please clarify this for me ,my undersatnding is caps from tv are interlaced and copies of dvds etc are progressive . Is this correct . What about satellite tv and digital cable . Thanks

[avih]

it all depends on the source (not the medium).

if the source was a film then it was originally progressive 24fps.
if the source was live TV (sports, live events etc) it's interlaced.
if the source is DV recording then it's usually interlaced.
music video clips are sometimes interlaced, sometimes progressive.

if the source was progressive, you may STILL have to capture it interlaced since many progressive sources are converted, telecined, frame shifted, etc. so if the source was progressive usually you SHOULD be able to turn it into back progressive before encoding. however, if it has gone through bad/many format conversions then the task might be a tough one.

when you enable 'interlaced' in the codec while capturing it usually doesn't change the compression itself, it just copes better with interlaced source, since the codec has the prior knowledge about one more aspect of the material (interlaced), hence, it will compress interlaced content better when 'interlaced' is checked.

cheers

[maxwell3]

Thanks . so If I understand correctly . If I use vdub to apply filters I should change it to progressive then (If the source is progressive ) or should I wait and do it (if I can )in CCE or is there a better way

[avih]

i don't use CCE so i can't comment on this one. usually though, you capture with a lossless codec, or nearly lossless (mjpeg), and then use avisynth for format conversions if needed, and then encode.

please go through the relevant guides in the guides section before your seek more clarifications. that's what the guides are for afterall.

[maxwell3]

. The guides are helpfull but after reading alot it gets a bit confusing.... Thanks for your patience and understanding

[avih]

Originally posted by maxwell3
. The guides are helpfull but after reading alot it gets a bit confusing.... Thanks for your patience and understanding they indeed contain a lot of material. the best way to learn is read, experiment, read more, experiment more, read more, [maybe ask some questions], read more, experiment, [maybe read some replies], read more, experiment, etc, etc etc ;)

good lock ;)