I have some DV footage, both 4:3 and 16:9 that I need to mix in a project. What would you do - make a 4:3 project and let black bars come on top and buttom of the 16:9 clips or something else?
I think that's what I'd do (a 4:3 project), it's kind of what analog TV broadcasters have got us used to -- of course that will change when it goes all digital . . .
To me, a letterboxed 16:9 in a 4:3 project looks better than a pillarboxed 4:3 in a widescreen project, but that's just what I've gotten used to seeing.
I would either crop the 4:3 to match 16:9 and do the whole project in 16:9 or I would pillarbox the 4:3 on a nice animated 16:9 background like the HD News casts do and do the whole project in 16:9. Either way I would deliver 16:9 to do justice to the 16:9 footage that you have.
I am going to slightly disagree with some folks here, I don't think you should chose one or the other based on how much footage you have, I think you should use 16:9. Why you ask?
Well, if some of your customers have a 16:9 TV, they will benefit from watching your footage in 16:9. If you letterbox it in a 4:3 project, you remove scan lines from the 16:9 footage and it will not benefit from a 16:9 TV.
On the other hand, someone with a 4:3 TV will lose nothing. He will see the same whether it is 16:9 or letter-boxed 4:3.
So, this is what you end up with:
4:3 project 4:3 TV best possible picture 16:9 TV loses scan lines
16:9 project 4:3 TV best possible picture 16:9 TV best possible picture
So, 16:9 is the obvious choice.
Let me elaborate just a little... assuming NTSC, adjust for PAL
4:3 footage in a16:9 project - lines = 480, on both TVs
16:9 footage in a 16:9 project - lines = 480 lines on 16:9 TV, 270 lines on 4:3 TV
4:3 footage in 4:3 project - 480 lines on both TVs
16:9 footage letterboxed in a 4:3 project - 270 lines on both TVs.
Even if the user zooms on the 16:9 TV to remove letterboxing, you have still delivered the footage with a maximum of 270 lines, which is sub-optimal. You should (IMHO) deliver the footage with as high quality as possible. If you know for sure there is nobody watching this on a 16:9 TV; then it doesn't matter.