13
votes
Accepted
Are there only a few standard video frame rates?
There are several "standard" frame rates, but there are getting to be so many that supporting arbitrary framerates is easier than specifically supporting many specific ones. This is especially true ...
- 2,690
13
votes
Accepted
ffmpeg- What's the difference between "NN000/1000 fps" and "NN000/1001 fps"?
Yes, 24000/1000 is 24 fps and 24000/1001 is 23.976fps. Some refer to the X/1001 frame rates as "drop down" (as in "dropped down from the integer") but this is easy to confuse with "pull down" which ...
- 387
10
votes
Accepted
Is it meaningful to raise frame rate, if so what is the best option?
Is it meaningful to raise the frame rate?
Usually, no. Exceptions are if you need to artificially generate slow motion using a robust tool like Twixtor.
What is the mechanism of -r 60 in the above ...
- 31.4k
6
votes
ffmpeg- What's the difference between "NN000/1000 fps" and "NN000/1001 fps"?
Those are rational numbers. So, 24000/1000 = 24.000 and 24000/1001 = 23.976. These are in fact the exact representations i.e. 23.976 is an approximation but 24000 divided by 1001 isn't.
As for why ...
- 31.4k
5
votes
Accepted
Why is Olympic slow motion footage sharp with little motion blur?
The MacCAM (used in Tennis back in 2004) used a 1000 fps frame rate and had just enough resolution to capture a tennis ball hitting (or missing) a line with reasonable resolution. Today, a Phantom ...
- 4,730
5
votes
Accepted
FFmpeg encode variable input framerate
When receiving frames from a raw input i.e. one without embedded timestamps, ffmpeg will assign timestamps in serial order, thus losing the temporal relation between the incoming frames.
When the ...
- 31.4k
4
votes
Interpreting 60fps to 24fps in Premiere Pro
I figured out the problem. My shutter speed was set too low. Turns out it needs to be double the frame rate in order to achieve a smooth motion when interpreted to 24 fps. Should have thought of that ...
- 201
4
votes
Accepted
What happens to frames when you speed up a video clip?
In the simplest case, half the frames -- every second frame, or all the even (or odd) numbered original frames -- are just gone, discarded. The frame rate of the resulting video does not change, it's ...
- 4,674
4
votes
Accepted
Why is ffmpeg outputting a 600fps video from a 120fps video input?
Update: The PTS entries of the input and output for the command below are identical in version N-79630-g9ac154d. Looks like the file is falsely flagged as VFR. But this single-step command below works ...
- 31.4k
4
votes
How to change framerate with HandBrake without side effects
FFMPEG is probably a better tool for the job, if you are prepared to deal with the command line. Install ffmpeg from the packages found here. These are all ready-built and should have all the included ...
- 13.6k
4
votes
ffmpeg- What's the difference between "NN000/1000 fps" and "NN000/1001 fps"?
The original framerate for broadcast television was 60 fields (half of a frame) per second in the U.S., and timing was based on the oscillation of AC power (so, clearly, European television needed a ...
- 141
4
votes
Accepted
What is the difference between audio Sampling rate and Frame rate?
Audio samples are encapsulated into frames as well. For PCM, the framing is notional, but for DCT-based codecs, it's a basic requirement.
AAC typically bundles 1024 samples per frame, so 1 second of ...
- 31.4k
4
votes
What is the proper notation for a frame rate that is less than 1FPS?
Frame per minute is totally fine. Frame per hour, frame per day. But I am not sure you can keep going using an acronym indefinitely.
But when talking about timelapse, you normally do not talk about ...
- 1,152
3
votes
fps changes during the record
It is possible that the device is dropping frames when recording. If there are a lot of apps running or the device is running low on memory. I would try rebooting the phone then try to record video ...
- 403
3
votes
Recording and playing video with variable frame rate
I recently ran into this issue...my transcoded-into-H264 videos started coming
out with VARIABLE frame-rates, whereas in the past, they had come out as fixed
framerate.
I use VLC-cmdline to do my ...
- 131
3
votes
Matroska format's framerate is not accurate with certain values
MKV does not store a frame rate in its container. So ffmpeg/vlc looks at the default duration of a frame instead. It sees 33.333ms and does the math, which is where your weird number comes from.
For ...
3
votes
Accepted
How to double video frames without any duplicate frames
Use
ffmpeg -i in.avi -r 50 -filter:v "setpts=0.5*PTS" out.avi
or
ffmpeg -i in.avi -r 50 -filter:v "setpts=N/50/TB" out.avi
If you want to interpolate new frames, use
ffmpeg -i in.avi -r 50 -...
- 31.4k
3
votes
Accepted
Does 60 fps make sense for YouTube?
Google has supported 60fps video since 2014. YouTube has a page that talks about video formats, codecs, framerates, etc., here. It is up to the Browser and YouTube to negotiate what format, frame ...
- 4,730
3
votes
What's the difference between 29.97p and 29.97fps?
A 29.97p (p = progressive) video is 29.97fps (fps = frames per second) but not all 29.97 fps video will be progressive. Some will be interlaced, (29.97i) having 59.94 "fields" per frame.
So there may ...
- 4,674
3
votes
Accepted
How to get smooth motion when changing clip speed?
Shooting at a higher shutter speed is not an option in my opinion, as it just blurs the motion until the problem is not visible.
I don't get that part. Isn't hiding the problem until it is no longer ...
- 5,392
3
votes
Accepted
Convert variable framerate ~60 FPS to constant 60 FPS losslessly
To start with: your version of Handbrake is old. Version 1.0.3 came out very recently, it's got some improvements over that older version.
Second, CQ0 is not actually "lossless." It's aiming for "...
- 124
3
votes
Can I reduce the delay between video frames?
It can be done with ffmpeg. I ended up using following:
ffmpeg -i input-file -vf "setpts=ifnot(isnan(PREV_OUTPTS)\,PREV_OUTPTS) + min(1000\,PTS - PREV_INPTS)" -c:v libx264 -preset ultrafast -crf 0 ...
- 141
3
votes
Accepted
A Sony Pro camera's spec shows it shots in 29.97fps, does it really mean it?
29.97 is shorthand for 30000/1001. There is no 29.970000... frame rate standard. FFmpeg will keep the native framerate (usually), so no need to specify an output -r value.
- 31.4k
3
votes
Is it meaningful to raise frame rate, if so what is the best option?
No, all it will do is waste space and lower the quality of your video. In theory, it shouldn't take too much additional space as the frames will be 100% copies of the previous frame, but it still ...
- 19.3k
3
votes
Accepted
Shutter Speed or frame rate we looking at when dealing with flickering issue?
The reason you get flicker in the video is that many conventional lights don't actually stay on all the time. When running on AC power, the power actually "goes off" 100-120 times a second (depending ...
- 19.3k
3
votes
Accepted
Does increasing the framerate while not changing the content affects compression quality?
This depends on the specific encoder, and the compression standard, by itself, may not have anything to say about it.
x264, which encodes to H.264, takes frame duration, into account, in its ...
- 31.4k
2
votes
Minimal working frame rate for H264 codec
I've played around with turning a bunch of still photos into a h.264 slideshow, mostly to compare the compression efficiency of JPG vs. h.264. I got some useful replies about the technical ...
- 2,690
2
votes
Accepted
Specify a custom "Movie rec. size" on Canon Rebel
Short answer: no. The presets you get are what you are stuck with.
If you can do 1920x1080 at 30fps, it's easy enough to use a video editor or converter to go down to 1280x720 with minimal loss.
I ...
- 181
2
votes
Does filming in 30p as opposed to 60p provide a brighter video?
Yes and no. Shutter speed is what determines how long light is gathered for and is not the same as frame rate. Frame rate does place a logical limit on your shutter speed as you need at least one ...
- 19.3k
2
votes
Sharp drop in FPS while recording
Most screen capture applications are pulling video from the video card down to main memory to compress it and write it to disk. Most video games are uploading textures and geometry to the video card ...
- 2,146
Only top scored, non community-wiki answers of a minimum length are eligible