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21st June 2010, 23:01 | #1 | Link |
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really interlaced?
I'm testing videos from sony nex camera, when I open in virtualdub mts file from other camera I see interlacing in 1 second... with this file, that mediainfo say interlaced TFF, I cannot see any kind of interlacing...
Here an example http://www.vimeo.com/download/video:...c28ed177e47e70 |
21st June 2010, 23:07 | #3 | Link | |
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I cannot access you file:
Quote:
Progressive footage can be encoded as interlaced. It's unnecessary and it hurts compression for no benefit, but it is possible. And it's not unusual at all in reality, i.e. in television broadcast. Therefore the only reliable way to check whether the the video is interlaced or not is looking at the unprocessed/unscaled content with your own eyes...
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21st June 2010, 23:19 | #6 | Link | |
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http://i48.tinypic.com/2qv4gw1.jpg Explanation already given in my previous post.
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21st June 2010, 23:26 | #8 | Link |
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Because it's more "safe", if you are uncertain about the nature of the content you are encoding.
Encoding progressive footage as interlaced works okay. It's not as efficient as it could be, but it certainly isn't a huge problem either. Doing it the other way around, encoding interlaced footage as progressive, is an absolute no-go! It would destroy the interlacing and thus screw up the content. Also: If your footage was encoded by a hand-held camera, I assume the hardware encoder chip they use simply is "hardwired" to interlaced encoding Maybe your camera even has different capturing/encoding modes, like 1080i60 -vs- 1080p30 ???
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21st June 2010, 23:27 | #9 | Link |
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Who or what encoded it? A video camera? If so, you have to ask the manufacturer. Maybe the hardware encoder chip they use only does field encoding. Or the manufacturer decided to do it that way for some reason. There's no good reason to encode *known* progressive content with fields that I know of. If you don't know the content, however, ...
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21st June 2010, 23:36 | #10 | Link | |
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nex3 (720 30p) nex5 (1080 50i) but now we have seen that it's impossible to ricreate very 50p with some boobber from this source file....I think that it's better nex3 now.... I For ""deinterlacing"" what I've to write in avs file? assume TFF() FieldDeinterlace() ? |
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21st June 2010, 23:39 | #11 | Link |
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Well, as the footage you posted was 1920x1080 at 29.97 fps and clearly is progressive, the "1080 50i" mode turned out to be a "1080 30p" mode
(But if the camera really did offer progressive and interlaced capturing modes, it indeed would make sense to have the encoder chip work interlaced in order to handle both cases) If the footage is progressive, then there is nothing to deinterlace. Hence you don't have to write anything. Yes, it's that simple (Applying a deinterlacer on progressive content would destroy detail for zero benefit!)
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22nd June 2010, 08:43 | #14 | Link | |
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Quote:
http://www.imaging-resource.com/PROD.../NEX5VIDEO.HTM |
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22nd June 2010, 09:05 | #15 | Link | ||
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Quote:
What the heck are they talking about? Given that the "AVCHD" sample file really came directly from that camera and also given they didn't process (e.g. deinterlace) the file after exporting it from the camera, they could have easily found out that the content obviously is not interlaced! It's 1080p30, encoded as interlaced (progressive segmented frame). Why are they speculating about "motion smoothness" when the facts are that clear? The sample clip contains 29.97 full frames per second there's no doubt about that. And hence there is no way to get more than ~30 "snapshots" per second of temporal resolution out of that...
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22nd June 2010, 10:37 | #17 | Link |
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My assumption would be that the "reviewers" used a televsion screen with built-in deinterlacer rather than a PC screen.
Thus it's hard (if not impossible) for them to decide between interlaced and progressive content, as you always get to the see the progressive/deinterlaced version, no matter what the source content was. Things get even messier if they use one of those fancy "100 Hz" or "200 Hz" television screens that will add artificial intermediate images to the actual content...
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22nd June 2010, 10:53 | #19 | Link |
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So the situation is quite clear
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22nd June 2010, 11:18 | #20 | Link | |
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