1 00:00:00,640 --> 00:00:05,190 Aftereffects we do a lot of effects on videos obviously. 2 00:00:05,490 --> 00:00:10,140 And one of the very useful effect is changing time. 3 00:00:10,290 --> 00:00:18,770 It means playing the movie faster or slower or mixing fast and slow and making some time in the video. 4 00:00:18,780 --> 00:00:20,740 That's very fast or very slow. 5 00:00:20,940 --> 00:00:28,640 And so on you know mixing all this time games we want to learn how to use the frames per second and 6 00:00:28,640 --> 00:00:31,160 understand what these frames per second for the video. 7 00:00:31,640 --> 00:00:38,270 And also for the composition after effects it's all the same concept and the same understanding how 8 00:00:38,270 --> 00:00:40,470 to use the frames per second. 9 00:00:40,640 --> 00:00:43,490 I have created a composition here this composition. 10 00:00:43,490 --> 00:00:51,170 If I come to composition setting you know do this very well I hope I have used 12 80 by 720 25 frames 11 00:00:51,170 --> 00:00:55,290 per second and the duration of the composition is 25 seconds. 12 00:00:55,310 --> 00:01:01,460 There is a layer here which is if you click on the video here you will see that we do is A.D. by 720 13 00:01:01,700 --> 00:01:03,530 It is 12 seconds and 12 frames. 14 00:01:03,530 --> 00:01:05,830 And also it is 25 frames per second. 15 00:01:05,840 --> 00:01:13,460 Now if you have a video that you want to put in a composition you should always try to match the frames 16 00:01:13,460 --> 00:01:18,770 per second of the video and the frames per second of your composition to do that. 17 00:01:18,800 --> 00:01:24,260 You don't have to come and create a compere a new camp and put the parameters that are there. 18 00:01:24,350 --> 00:01:30,070 The easiest way to create it is to click on the video derogate and put it on the. 19 00:01:30,380 --> 00:01:33,670 I can hear that represents the camps and letting go. 20 00:01:33,920 --> 00:01:41,630 So immediately ill create a new composition for you where it places the video player and also it uses 21 00:01:41,630 --> 00:01:46,140 the same parameters or the same settings as the video itself. 22 00:01:46,190 --> 00:01:46,700 Fine. 23 00:01:46,940 --> 00:01:49,410 I will delete this one we don't need it just to show you. 24 00:01:49,690 --> 00:01:53,410 This is the best way if you have a single video within your composition. 25 00:01:53,490 --> 00:01:59,240 So this is the video I'm going to play it is a simple video is around 12 seconds like we said and we 26 00:01:59,240 --> 00:02:03,650 are going to decide OK I want to make that video faster. 27 00:02:03,650 --> 00:02:06,290 The first option I have and there are similar options. 28 00:02:06,320 --> 00:02:14,060 The first option I have is to change the frames per second for the video the original footage that I 29 00:02:14,060 --> 00:02:14,520 have. 30 00:02:14,570 --> 00:02:16,010 What is frames per second. 31 00:02:16,010 --> 00:02:17,290 Lets look at it. 32 00:02:17,360 --> 00:02:25,570 If I stretch to the maximum I notice that have zero one frame 0 2 frames 0 3 0 4 or 5 video is usually 33 00:02:25,580 --> 00:02:30,970 shot through a camera and this camera settings could be 25 frames per second. 34 00:02:30,980 --> 00:02:38,060 It means every second there will be 25 frames and if you put them all together and play them through 35 00:02:38,060 --> 00:02:40,340 one second it will make a certain movement. 36 00:02:40,340 --> 00:02:43,780 Of course I'm sure you know all already that you can shoot also. 37 00:02:43,860 --> 00:02:47,180 Up to 60 frames per second in a normal camera. 38 00:02:47,330 --> 00:02:52,170 So for here I have 25 frames for every second. 39 00:02:52,460 --> 00:02:59,840 Now if I make it 50 frames per second what will happen is if I take this same movie and make it 50 frames 40 00:02:59,840 --> 00:03:05,130 per second of course it will look like it is a bit faster. 41 00:03:05,390 --> 00:03:08,480 Lets try to change the speed of our footage. 42 00:03:08,600 --> 00:03:13,140 You select your footage here and come to the into Prete footage. 43 00:03:13,190 --> 00:03:22,110 Just the I can hear it click on it and it will open a dialog box that it is about to beat ceiling. 44 00:03:22,190 --> 00:03:23,870 Thats the name of the video of course. 45 00:03:23,870 --> 00:03:26,010 So you have main option and color management. 46 00:03:26,090 --> 00:03:28,730 We care about the frame rate only. 47 00:03:28,730 --> 00:03:30,940 So this is 25 frames per second. 48 00:03:30,950 --> 00:03:38,970 What happens if I make it 50 frames per second you know exactly that had the duration of your video 49 00:03:38,970 --> 00:03:41,790 is cut by have already doubled the frame rates. 50 00:03:41,790 --> 00:03:43,310 Remember it was 12. 51 00:03:43,320 --> 00:03:47,930 Now it is or it is six seconds 50 frames per second. 52 00:03:48,060 --> 00:03:54,420 If I click OK or press ENTER NOW THE VIDEO IS NO MORE 12 seconds is only six. 53 00:03:54,570 --> 00:03:56,000 If I play it here you are. 54 00:03:56,010 --> 00:04:00,210 It looks much faster and its you know quite funny is jumping fine. 55 00:04:00,210 --> 00:04:01,920 So what did aftereffects do. 56 00:04:01,920 --> 00:04:08,520 Let's zoom in and you notice now it has deleted or it has merged Actually it has deleted certain frames 57 00:04:09,030 --> 00:04:16,020 and compressed them maybe to make it look like it's faster so I don't have any more 25 frames per second. 58 00:04:16,020 --> 00:04:18,450 I have 50 frames per second. 59 00:04:18,570 --> 00:04:21,270 And now the video is shortened in time. 60 00:04:21,290 --> 00:04:22,380 Now that's very nice. 61 00:04:22,380 --> 00:04:26,010 Let's go back to our we select our selling video. 62 00:04:26,160 --> 00:04:32,650 We click on into each footage and we bring it back to let's see 12. 63 00:04:32,670 --> 00:04:37,990 Now if I put 12 frames per second the duration of the video is going to become 26. 64 00:04:38,020 --> 00:04:40,000 Notice I'm changing the footage here. 65 00:04:40,260 --> 00:04:42,980 I'm not changing the movie on my storage device. 66 00:04:43,020 --> 00:04:44,650 I'm enjoying it just yet. 67 00:04:45,030 --> 00:04:49,130 So I have 12 frames per second and now it's 26 seconds. 68 00:04:49,170 --> 00:04:52,340 Press Enter now the video is quite long. 69 00:04:52,530 --> 00:04:58,560 It's even longer than the compositionally can star come here and adjust the time you make it for example 70 00:04:58,560 --> 00:05:02,980 40 seconds and the period. 71 00:05:03,050 --> 00:05:04,290 So now it's quite ok. 72 00:05:04,310 --> 00:05:12,140 I can see it here if I play my footage now you got this it's quite slow of course it's almost half the 73 00:05:12,140 --> 00:05:13,370 time even more. 74 00:05:13,580 --> 00:05:17,720 So where did these extra frames come from. 75 00:05:17,730 --> 00:05:19,420 That's a good question to ask. 76 00:05:19,430 --> 00:05:19,820 OK. 77 00:05:19,820 --> 00:05:21,920 I had 25 frames. 78 00:05:21,920 --> 00:05:24,080 Now I have 12 per second. 79 00:05:24,080 --> 00:05:25,390 Where do they come from. 80 00:05:25,640 --> 00:05:30,680 Let's zoom in and see exactly what the after effects that this is my first frame. 81 00:05:30,680 --> 00:05:32,000 Nothing is happening. 82 00:05:32,000 --> 00:05:33,470 Another one nothing is happening. 83 00:05:33,470 --> 00:05:37,960 And so on until the number five. 84 00:05:37,970 --> 00:05:41,840 So four five frames it was still the same frame. 85 00:05:41,930 --> 00:05:48,140 So I said if X had duplicated these frames one after the other then if I come to six nothing happens 86 00:05:48,230 --> 00:05:57,650 and so on until the next frame it's almost at 8 here nine a bit more and nothing happens so actually 87 00:05:57,980 --> 00:06:04,760 actually these are what after effects has done is to duplicate the frames are deflected the shots if 88 00:06:04,760 --> 00:06:05,390 you want. 89 00:06:05,390 --> 00:06:08,900 So now for the first five frames is the same one. 90 00:06:08,900 --> 00:06:11,930 Now you get the movement here or you get the animation. 91 00:06:11,930 --> 00:06:13,250 That is not very smooth. 92 00:06:13,250 --> 00:06:15,640 You know it's like jumping a bit. 93 00:06:15,650 --> 00:06:18,070 So now let's look exactly what happened here. 94 00:06:18,110 --> 00:06:22,930 I come to this frame zoom in and look at it carefully. 95 00:06:23,270 --> 00:06:24,460 That is one frame. 96 00:06:24,470 --> 00:06:26,610 OK it has moved from here to here. 97 00:06:26,780 --> 00:06:28,000 Then it moves in nothing. 98 00:06:28,010 --> 00:06:32,680 And here and here and here you notice how the movement is jumping. 99 00:06:32,810 --> 00:06:39,260 The I can't see that because now I can discern between these frames there is time enough for me to see 100 00:06:39,260 --> 00:06:42,210 that it is jumping even on normal speed. 101 00:06:42,230 --> 00:06:46,350 You can see how I see jumpgate fact how to remedy that. 102 00:06:46,430 --> 00:06:50,590 The first option you have is enable frame blending. 103 00:06:50,630 --> 00:06:55,840 It means after are going to blend two frames together to create your missing frame. 104 00:06:55,850 --> 00:06:57,830 That's one way to do it to do that. 105 00:06:57,830 --> 00:07:00,730 First of all you enable frame blending here. 106 00:07:00,890 --> 00:07:07,010 This is for the preview to be able to preview and then you put the frame blending on this small. 107 00:07:07,010 --> 00:07:12,980 I can here click just once when you click once it start blending the frames. 108 00:07:12,980 --> 00:07:17,530 Now notice what's happening before I have this position of the mast. 109 00:07:17,840 --> 00:07:21,640 And then one more I have like two mass here. 110 00:07:21,640 --> 00:07:23,460 There is kind of shadow. 111 00:07:23,800 --> 00:07:24,280 OK. 112 00:07:24,290 --> 00:07:25,310 So let's come back here. 113 00:07:25,310 --> 00:07:26,890 This is the first one. 114 00:07:26,960 --> 00:07:31,310 This is the same one than this one and this one. 115 00:07:31,310 --> 00:07:38,650 So after if they had taken this frame and this frame and blend them to have the flame in between. 116 00:07:38,690 --> 00:07:44,520 So now you have like a ghost here or you know it kind of shadow we call that many ghosts. 117 00:07:44,570 --> 00:07:50,770 So let's look at the movies sometimes some movies videos can be you know rendered very nicely here and 118 00:07:50,790 --> 00:07:51,840 look very small. 119 00:07:52,040 --> 00:07:55,110 But now in this one we see the ghost a bit. 120 00:07:55,220 --> 00:08:00,350 It's not much if you're just uploading this to Facebook and so on is OK but if you're doing a professional 121 00:08:00,350 --> 00:08:02,720 job there will be a really big problem. 122 00:08:02,960 --> 00:08:05,050 Let's go back what other options we have. 123 00:08:05,240 --> 00:08:10,190 If I click once again now this is a frame blending. 124 00:08:10,240 --> 00:08:14,240 If I click once again I will be mixing boxes. 125 00:08:14,270 --> 00:08:16,080 It means that let's zoom in 126 00:08:18,620 --> 00:08:23,900 aftereffect is going to try to guess what is the next position of that box. 127 00:08:23,920 --> 00:08:28,720 So if you come here than here over here now there is no more boasting. 128 00:08:28,930 --> 00:08:30,400 What happens is after effects. 129 00:08:30,460 --> 00:08:37,440 Looked at this frame and looked at the frame after for example this frame and the frame after that and 130 00:08:37,440 --> 00:08:41,110 they decide OK this is where the pixels are. 131 00:08:41,110 --> 00:08:43,490 And this is where the pixel will be. 132 00:08:43,510 --> 00:08:50,090 So in between I'm going to invent a new you know position for the pixels. 133 00:08:50,170 --> 00:08:54,500 So actually not using frames but it's using movement of boxes. 134 00:08:54,520 --> 00:09:00,240 And that's why is pixel motion you are motioning or you are moving the pixels. 135 00:09:00,250 --> 00:09:02,170 This is a very important concept. 136 00:09:02,170 --> 00:09:08,590 The difference between blending frames creating an in-between frame that is the blend of the one that's 137 00:09:08,590 --> 00:09:10,700 before and the one that's after. 138 00:09:10,830 --> 00:09:19,210 And the big set motion where after effects try to guess or try to understand the frame before or the 139 00:09:19,210 --> 00:09:26,520 position of the as before and the position of the pixels after and to create one in between. 140 00:09:26,560 --> 00:09:28,870 To give you a smooth motion. 141 00:09:28,930 --> 00:09:35,170 Now this is very important when you become a real pro you you're not is that many of these techniques 142 00:09:35,620 --> 00:09:40,000 are not very conducive when you're doing commercial high quality work. 143 00:09:40,000 --> 00:09:42,080 But for now it's OK. 144 00:09:42,220 --> 00:09:43,650 You can start learning from that. 145 00:09:43,660 --> 00:09:46,270 And then we go to maybe in this course. 146 00:09:46,270 --> 00:09:53,050 I hope so to go to more advanced Plug-In that you will help you're doing you know more the better merging 147 00:09:53,080 --> 00:09:54,880 and better slow motion. 148 00:09:54,940 --> 00:10:00,200 Now let's play our movie put it back at 100 percent and I think this is OK. 149 00:10:00,370 --> 00:10:01,830 We have stretched the time. 150 00:10:01,840 --> 00:10:10,000 It has become a very slow and we have used books in motion here to be able to have its most movement. 151 00:10:10,000 --> 00:10:12,360 Now there are few things you have to look at. 152 00:10:12,370 --> 00:10:14,550 We have changed the footage. 153 00:10:14,830 --> 00:10:19,330 So if I come here and create a new composition with the same footage. 154 00:10:19,690 --> 00:10:26,040 Of course the layer here is going to use this footage which is the modified footage here. 155 00:10:26,320 --> 00:10:33,550 So by changing the footage by changing the interpretation of the footage you are exactly changing the 156 00:10:33,550 --> 00:10:39,960 footage in your whole project not only in the composition but sometimes you don't want to do this. 157 00:10:39,960 --> 00:10:41,500 Or delete this one. 158 00:10:41,980 --> 00:10:49,300 And what you want to do is just to change the layer speed or you know working only on this they are 159 00:10:49,300 --> 00:10:50,730 not playing with the footage. 160 00:10:50,900 --> 00:10:52,610 We see that in the next lecture.