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Questions tagged [keyframes]

Keyframes are points in time at which parameters should have certain values. In keyframe animation, the animation or editing software will then blend between these values over time.

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How to change the font and color on multiple keyframes at once | Adobe After Effects

Hey there i ran into a small problem creating a video and I haven't used any video editing software before so i am lost right now and i have no idea on how to solve my problem which problem goes like ...
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FFmpeg: Cutting 3 seconds at the beginning of a video leaves 5 seconds blank

I have an MKV video, and want to cut the first 3 seconds. I tried with FFmpeg: ffmpeg -i /input.mkv -ss 00:00:3.0 -c copy -t 00:09:58.0 output.mkv But the result (when played in VLC) is that there ...
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Security video missing time and frames

Why does a DVR or CCTV system randomly drop time or frames? I am viewing footage that says it is 12fps but, it is scanning at 10fps. These files were exported as AVI. Thanks
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Upscale the key frames while decoding!

I would like to apply some kind of super-resolution (SR) to the keyframes in an H.264 video. The SR process should target the keyframes and upscale them by a factor of 2. For the past few days, I've ...
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Frame capture from videos: I-frame vs P-frames

I'm trying to capture various frames within a x264-encoded video files into png files (in python), and then compare the quality of them: cap = cv2.VideoCapture(filename); //get frame_number for ...
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29 views

Premiere Pro shifting keyframes during an insert edit

During an insert edit all clips (video and audio) shift right except the keyframes (track volume) themselves on the audio tracks. Similar if I select all and move, keyframes are not included. How can ...
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Applying identical keyframes to identical objects w/variation

I have the following animation, in which a ball goes from the flashlight to the end of the frame. However, how do I create multiple iterations of this animation, except with the ball following the ...
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1answer
47 views

What is algebraic effect of transforms in Adobe After Effects Keyframe Data file?

I want to write software which peforms a pan, zoom, rotate, and resample on a 3840x2160 input video, yielding a 960x540 output video. I have an keyframe data file, exported from Adobe After Effects, ...
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Video: What are I-frames and why do they affect the size of the video?

Videos usually are described by a set of parameters including: bit rate, frame rate, width & height. But I came to realize that there are more parameters including B-frames and I frames (or I ...
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592 views

concat files with ffmpeg and preserve exact frame timestamps

I'm doing this to add a keyframe at 00:00:14.0000 1. ffmpeg -i trailer.mp4 -to 13.92 -copyts -c copy first-bun.mp4 2. ffmpeg -ss 14 -i trailer.mp4 -to 15 -video_track_timescale 90000 -copyts bun.mp4 ...
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384 views

How do I make this object orbit around the center without making it turn

I have this atom that I want to animate in after effects (yes I know you have more than one electron in carbon, but that's not the point). I want this electron to orbit around the middle of the atom. ...
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FFMPEG dropping the first two frames of segments generated through seeking

I'm trying to script-cut a 24 fps video and it gets close to the right thing, except for two missing frames at the beginning of every segment I cut with seeking. I've found out that index-frames (...
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1answer
60 views

Stop motion animation and audio keyframes in AE

so I'm completely new to After Effects (normally work with premiere or stop motion animation) so if I've not given enough/or the right information, just let me know what you need to know. I have a ...
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571 views

Why are there two ways to keyframe-animate geometric transformations?

In DaVinci Resolve 14, there seem to be two ways to use keyframe animations with geometric transformations. One is on the Edit page, using the Inspector. Here it seems to be possible to smoothen out ...
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2answers
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Custom formula for keyframe automation - Adobe Premiere Pro

Is it possible to enter custom math/scripting formulas for keyframe animation inside Premiere Pro?
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83 views

Dealing with dropped frames in background plate when doing keyframe animation in After Effects

I am working on a video which includes some dropped frames ever so often. When a frame dropped, it repeated the previous frame sometimes 2 or 3 times. I am overlaying many objects on this video, and ...
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1k views

Why does Adobe Premiere CC change my “Ease Out” keyframe interpolation to “Bezier”?

In Adobe Premiere CC, I keep trying to set my position keyframe's temporal interpolation to "Ease Out". After I set it, I recheck the context menus immediately, and it has reverted to "Bezier". Why ...
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659 views

How does the h.264 encoder determine where to put i-frames?

I'm reading a bit on I-frames and their counterparts, P-frames and B-frames. I understand the usage. I-frames are the key to the compression and following P and B-frames can use the data in I-frames ...
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3k views

How to identify i-frame from idr-frame in the ffprobe show frames output?

The ffprobe show frames output shows the following details: [FRAME] media_type=video key_frame=1 pkt_pts=42 pkt_pts_time=0:00:00.042000 pkt_dts=42 pkt_dts_time=0:00:00.042000 pkt_duration=N/A ...
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1answer
1k views

After Effects : shortcut for next keyframe on current layer?

I know about the J and K shortcuts for the previous/next (visible) keyframe on the timeline. I was wondering if there was something similar to reach the previous/next keyframe on the current layer. ...
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1answer
163 views

How to compromise between byte rate, resolution and fps

I want to stream a video on a device full screen (therefore, the dimensions of the display are fixed) What should I focus on to offer the best experience for a given bandwidth? Should I have other ...
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1k views

How to select multiple keyframes in Premiere?

I had accidentally created numerous wrong keyframes, trying to tune volume. Now I would like to delete them. Unfortunately, I can't select multiple keyframes by mouse: When I release mouse, all ...
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Transposing keyframes or recursive keyframing in AE

I want to embed a clip inside of itself inside of itself inside of itself. I have a clip of a person using a tablet, and I want the same clip displayed on the tablet. I have tracked the motion of the ...
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2answers
2k views

Moving keyframes with duration change

I have a still image with four opacity keyframes which look like this: When I change the duration my keyframes stay at the same place (which is normal). Is there a way to move the keyframes ...
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How can I set the first frame of a video to an I-frame and the rest to P-frames (preferably with ffmpeg)?

I'd like to try to do some datamoshing like this tutorial. But I'd like to be able to do it programatically, so instead of vdub and avidemux, I'd like to figure out how to do as many parts of this ...
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1answer
1k views

Frames with pict_type=I yet key_frame=0

I am trying to exrtact key frame information from a mp4 video using ffprobe with the command: ffprobe -select_streams v -show_frames FILE_NAME 2>/dev/null I am getting the list of all frames. ...
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2answers
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Is there such thing as an unlimited point matte in Premiere?

Basically my problem is I have footage which I need to manually key. I need something like an unlimited point matte which would allow me to cut an actor out of a background by hand with no limits on ...
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2answers
2k views

How can I achieve the Ken Burn Effect with greater control or in other software?

I am using the Ken Burns effect in Final Cut Pro X, however it does not allow me enough control over how it behaves. I end up having to cut the video in to multiple clips in order to get the effect ...