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 ...
- 397
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 ...
- 32.6k
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 ...
- 32.6k
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
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 ...
- 32.6k
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 ...
- 32.6k
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 ...
- 32.6k
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 ...
- 13.7k
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
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
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
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 -...
- 32.6k
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
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 ...
- 5,412
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.
- 32.6k
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 ...
- 32.6k
2
votes
Accepted
software for frame images to video with changing framerate?
This is a really late response but I just stumbled onto the question.
The software you're looking for is Adobe After Effects.
Inside After Effects, you'll end up using the effect called "Time ...
- 36
2
votes
Accepted
How to fix a 24fps shot that looks jerky when rendered at 30fps frame rate?
If you change the frame rate of everything to 60fps you'll get an even frame blend every 2.5 (60fps) frames. If you change the frame rate to 120fps you can eliminate the stutter completely, as 30 fps ...
- 4,730
2
votes
Accepted
60fps and 30fps clips exported into one file?
Export to 30p. 29.97 to be exact if there is the option. Exporting at 60fps is only going to bloat the file size (twice as many frames) per second-- if it's 60p and not 60i of data to encode.
...
- 2,477
2
votes
Improve video quality by lowering framerate
Theoretically it IS possible, and there are working, practical, proof-of-concept research on the subject.
A couple of examples:
Learning to Extract Flawless Slow Motion from Blurry Videos
Blurry ...
- 121
2
votes
Why is Olympic slow motion footage sharp with little motion blur?
The official local broadcast equipment supplier is Panasonic. Most countries take the local broadcast partner's feed of the games. Looking at footage of athletics, swimming, rowing and team sports I ...
- 308
2
votes
Accepted
Bit rate reduction when converting 60fps footage into 30fps?
In theory, if the number of keyframes and their placement were about the same, as decided by the encoder, then yes, you can reduce the bitrate to half and retain the same quality. In practice, the ...
- 32.6k
2
votes
How to get smooth motion when changing clip speed?
There is a substantial body of literature explaining how frame rate and shutter speed relate to achieve desirable perceptions of motion. In general, a shutter speed that is 1/2 of the frame rate (1/...
- 4,730
2
votes
Accepted
Can duplicate frames from an h264 stream be dropped without encoding?
Almost all encoded frames depend on the surrounding frames, so it's virtually impossible to delete anything from the encoded output without negatively affecting the video. Short answer: no, you can't ...
- 4,674
Only top scored, non community-wiki answers of a minimum length are eligible