Attempting to build my very first Video Wall as an introductory sequence (25 clips running for 14 seconds), I note that whilst all my video is at a resolution of 1280 x 720,but my frames per second vary between 25.00 and 29.97.
Just wondering if it Is okay to mix fps clips? Any suggestions please.
George
I think I may, during the middle of the night, came up with the answer and wonder if this is a logical thought process? No doubt there is a simpler way, but what I have been doing so far is to first edit and cut up 14 second clips for later use on the Video Wall.
1) Video clips so far used are running at 29.97fps. So if my Video Wall attempt lasts for 14 seconds, that means each sequence part in the wall will have 419.58 frames (29.97fps x 14secs = 419.58 frames).
2) By comparison, if I complete my Wall by using clips that run at 25fps, these sequences will have 350 frames (25fps x 14secs = 350 frames). So if continue to edit and cut at the14 seconds mark, this means that these clips will be shorter by comparison???
So the difference between (1) and (2) is 69.58 frames (419.58 - 350). This means that movie clips that run at 25fps, in this Wall, are shorter and when first preparing will need to be cut 2.74 seconds longer??? Does that make sense? (419.58 - 350 = 69.58 frames. Divide this figure by 25fps = 2.74 seconds extra required so that all clips end at the same time????)
Probably will not be too noticeable that some clips are ending early in such a relatively short sequence but just wonder if this new logical thought process is indeed logical and that I may have got my head around the issue.
Am I right?
Will there be any issue with MEP as a result of mixing clips in one project with a different frame speed?
George
Hi George
I can see where you are coming from with this line of thought, however the frame rate is to all intents and purposes not relevant, it will be fixed when you either export the movie or created a disc, however the length of the clips is important.
A lot depends on how the individual videos in the wall are appearing - if all at once then they should all run for the length of the wall if you want to avoid repeating either in part or all of a clip.
If the clips are appearing on the wall one at a time in quick succession then the lengths can be different according to the time each clip appears.
Here is an example I did manually in MEP, however normally I would use Heroglyph to build a video wall, it has a video wall function, is quicker and can have more sophisticated effects with little effort required.
HTH
John EB
John,
An interesting example, thankyou.
My thought process for this project was that I would have 25 video clips of 14 seconds each on view at the same time.
George
Hi George
. . . . I would have 25 video clips of 14 seconds each on view at the same time . . . .
If this is full screen and you are intending to produce a DVD or BD disc, then there is one thing to be aware of and that is TV cropping.
Depending on how much cropping of the video the TV does, and not all TV's are the same, the images around the perimeter of the wall will be cropped at top, bottom, left or right depending on there position, hopefully you can see this in the 2 images below
No cropping
TV cropped
HTH
John EB
John
That is the type of screen I 'was hoping' to produce. Thankyou also, for pointing out something else to consider. Always learning!
In your examples, to produce that effect, would you have done that manually in MEP or use the 'Heroglyph program' you introduced us to in this posting? Never come across that program before and looks quite an interesting addition.
However, at first testing, I have about 8 more clips to add to my Video Wall. So, despite these clips will now be 25fps, being different fps, will that make any difference to when each clip in the Video Wall ending or can I go ahead and crop/edit exactly 14 seconds each time?
George
Hi George
I am currently working on my lap top so I cannot give an example using Heroglyph (not installed), however for the example above doing this manually is easy enough if a little repetitious.
The full screen example above was done manually and took about 10 minutes.
Once you have worked out the actual 'image' size needed, you can work out the co-ordinates for the top left corner of each clip.
If you need to allow for TV cropping then a border equal to the cropping value on all sides needs to be taken into account.
In this case 5 columns x 5 rows to fill a screen 1920 x 1080 = gives a clip width of 384 px , height is automatically taken care of if maintaining the aspect ratio and works out to 216 px.
Based on no TV cropping:
- the left values are 0, 384, 768, 1152, 1536
- and the top values are 0, 216, 432, 648, 864
Then set up the clips on the timeline and using View/animation, Size/position set each clips size, left and top values.
HTH
John EB
John
All valuable information, thankyou.
Although I say it myself, think I am not too bad at working out the values when considering Aspect Ratio and am pretty sure that for that I have to thank yourself and Terry for your help a few years back.
George
Hi George
To clarify - you do not need to worry about different fps as the "timeline" on which you edit is based on "time" and you are trimming to time, unless you are trimming to parts of second.
Strictly speaking you could lose or gain a frame here and there mixing the 2 frame rates, because (29).97 is not a whole frame but you would not notice it in the scheme of your videowall.
Peter
Peter,
Many thanks for that clarification.
George
Hi George
. . . . Although I say it myself, think I am not too bad at working out the values when considering Aspect Ratio . . . . and am pretty sure that for that I have to thank yourself and Terry for your help a few years back . . . .
Now you mentioned it, IIRC, you were wanting to make collages which does naturally involve some serious maths for size and positioning, my apologies if I repeated myself.
The 'how to work out the dimensions' etc was included so other users who read this topic, and want to do the same, have an example to work from.
Cheers
John EB