|
|||||||||
|
Thread Tools | Search this Thread |
July 7th, 2011, 10:56 PM | #31 |
Major Player
Join Date: Oct 2009
Location: Reno, NV
Posts: 553
|
Re: Canon Vixia HF G10 Sample videos
Broadcast sports is generally 60i or 60p. When shooting with the HFG10 for web delivery, the need or lack of need for slow motion replay determines whether to shoot in 60i or 30p. If you need slow motion, shoot 60i.
|
July 10th, 2011, 05:02 AM | #32 |
Regular Crew
Join Date: Sep 2009
Location: Zürich Switzerland
Posts: 81
|
Re: Canon Vixia HF G10 Sample videos
|
July 10th, 2011, 07:40 AM | #33 |
Regular Crew
Join Date: Oct 2009
Location: helsinki
Posts: 104
|
Re: Canon Vixia HF G10 Sample videos
Because 60 is better than 30?
|
July 10th, 2011, 09:37 AM | #34 |
Regular Crew
Join Date: Sep 2009
Location: Zürich Switzerland
Posts: 81
|
Re: Canon Vixia HF G10 Sample videos
|
July 11th, 2011, 06:27 PM | #35 |
Major Player
Join Date: Oct 2009
Location: Reno, NV
Posts: 553
|
Re: Canon Vixia HF G10 Sample videos
60i can be deinterlaced to 60p and 60p can slowed to 30p to obtain smooth 1/2-speed slow motion. If you start with 30p and slow it down to 1/2 speed you end up with 15p which isn't very smooth. It is possible to smooth 15p out using motion estimation, however this type of processing works best for smoothing out large scale movement and slow motion in sports needs to reveal quick small scale movements to be interesting. Thus, shooting 60i or 60p is necessary for slow motion. Over cranking to 120p would be even better and could be used to obtain smooth 1/4-speed slow motion at 30p, but this is not an option on the HFG10.
Last edited by Eric Olson; July 12th, 2011 at 10:47 AM. |
July 12th, 2011, 06:47 PM | #36 |
Regular Crew
Join Date: Oct 2009
Location: helsinki
Posts: 104
|
Re: Canon Vixia HF G10 Sample videos
Maybe you should learn the difference between 60 and 30? Yes, 60 is interlaced, but that is still 2x more temporal information. Eric has it right.
|
July 18th, 2011, 02:22 PM | #37 |
Regular Crew
Join Date: Sep 2009
Location: Zürich Switzerland
Posts: 81
|
Re: Canon Vixia HF G10 Sample videos
|
July 18th, 2011, 02:28 PM | #38 | |
Regular Crew
Join Date: Sep 2009
Location: Zürich Switzerland
Posts: 81
|
Re: Canon Vixia HF G10 Sample videos
Quote:
But just to be clear: when you say "temporal information", you mean the two parts of the same frame, torn apart and separated by time in half resolution fields? |
|
July 19th, 2011, 10:39 PM | #39 |
Major Player
Join Date: Oct 2009
Location: Reno, NV
Posts: 553
|
Re: Canon Vixia HF G10 Sample videos
A detailed explanation of how to deinterlace 60i to obtain 60p is at
Eugenia's Rants and Thoughts Blog Archive Butter-smooth slow motion You can find similar articles by searching this forum and elsewhere. |
July 21st, 2011, 03:13 AM | #40 | |
Regular Crew
Join Date: Sep 2009
Location: Zürich Switzerland
Posts: 81
|
Re: Canon Vixia HF G10 Sample videos
Quote:
But please tell me that you realize that you cannot "obtain" 60 progressive frames out of 60 interlaced fields. Please acknowledge this!! What you CAN do, using more or less sophisticated software, is to BLEND frames. It has been available in After Effects for quite some time: By studying two successive frames and the pixel motion, the software can inject new frames, synthesized out of thin air (i.e. create new frames and pixel data not previously there). The results may vary from very good to quite poor, depending on source footage and how much you're trying to push it. This way I could create a 300p file from 30p footage. But... this is not what this discussion was/is about. 60i makes for 30p. And for each of those "p" frames, two "i" fields are used. Those two "i" fields are separated by time if you shoot in a "i" format. And there is nothing that will or can change this 'after the fact'. IF you KNOW that you will do frame blending via pixel motion, it might be interesting to to shoot 60i due to the fact that you get twice as many "half resolution frames" that the software can use when synthesizing new pixels. I haven't seen this tested, but it would be interesting to see how it compares to pixel motion from 30p footage. But let's not for an instant assume that this is a "normal" workflow, or that this is what is happening behind the scenes in a normal video editing suite when your 60i footage is being deinterlaced. I hope this helps and that we are now all clear on what is what. |
|
July 21st, 2011, 12:15 PM | #41 |
Major Player
Join Date: Oct 2009
Location: Reno, NV
Posts: 553
|
Re: Canon Vixia HF G10 Sample videos
Starting with 60 fields per second just rescale the fields into frames to get 60 frames per second. In the context of slow motion for sports, rescaling the fields in 60i to 60p and slowing this down to 30p looks far better than starting with 30p and slowing that down to 15p. However, if you do not want slow motion, film in 30p for web delivery.
|
July 21st, 2011, 12:47 PM | #42 |
Major Player
Join Date: Jul 2010
Location: Southport, United Kingdom
Posts: 723
|
Re: Canon Vixia HF G10 Sample videos
Any opinions here as to how good the camera is as I'm thinking of buying one?
Ron |
July 22nd, 2011, 11:59 AM | #43 | ||||
Regular Crew
Join Date: Oct 2009
Location: helsinki
Posts: 104
|
Re: Canon Vixia HF G10 Sample videos
Quote:
Quote:
Quote:
Quote:
|
||||
July 22nd, 2011, 05:40 PM | #44 | |
Trustee
Join Date: Mar 2005
Location: Coronado Island
Posts: 1,472
|
Re: Canon Vixia HF G10 Sample videos
Quote:
Here is a massively detailed review of the camera: Canon Vixia HF G10 Camcorder Review - CamcorderInfo.com
__________________
Bob |
|
July 24th, 2011, 08:13 AM | #45 |
Regular Crew
Join Date: Sep 2009
Location: Zürich Switzerland
Posts: 81
|
Re: Canon Vixia HF G10 Sample videos
See! I knew we could get there if I only held my breath long enough!!
If you want to read up on Bob Deinterlacing, here's a small snippet from Wikipedia: "Simple doublers (Bob and Linear) display only one half-picture at a time. Nevertheless, the quick alternating display produces a convincing illusion of full vertical resolution while playback is running." |
| ||||||
|
Thread Tools | Search this Thread |
|