frame-rate

Generate a 2-fps mp4 from images using FFMPEG

倖福魔咒の 提交于 2019-12-02 20:46:01
问题 Need to create a video from a series of images. The video needs to have a low frame rate. This is the command I use to create the video. ffmpeg.exe -r 2 -i images/%3d.jpg -vcodec libx264 -pix_fmt yuvj420p output.mp4 The problem is that, while the video works just fine when played through a HTML5 video, it doesn't really work when the file is downloaded locally and played through either the Windows 10 default video player or even VLC (weirdly, the default video player works better). Can anyone

Is it possible to read webcam frames in parallel?

为君一笑 提交于 2019-12-02 18:36:15
问题 I have a simple Python script that captures a webcam using OpenCV. My webcam has the potential to stream 30 FPS, but since my Raspberry Pi isn't powerful enough, I can only read ~ 20 FPS. When running the script, one core of my CPU is maxed to 100%, but the the rest of the cores are untouched, so I am trying to split up the reading into the most threads I can in order to use my CPU to it's maximum potential and easily reach 30 FPS. So is it possible to read webcam frames in parallel? This is

Regulating the number of executions per second using JavaFX

核能气质少年 提交于 2019-12-02 18:07:10
问题 So as of right now I'm implementing Conway's Game of Life using JavaFX. In a nutshell, in my class extending AnimationTimer, within the handle() method, it traverses through every cell in a 2D array and updates each position, then draws to the canvas using the information in the 2D array. This works completely fine but the problem is it runs far too fast. You can't really see what's going on on the canvas. On the window I have the canvas as well as a few buttons. I added a Thread.sleep(1000)

Linux: Screen desktop video capture over network, and VNC framerate

徘徊边缘 提交于 2019-12-02 17:07:20
Sorry for the wall of text - TL;DR: What is the framerate of VNC connection (in frames/sec) - or rather, who determines it: client or server? Any other suggestions for desktop screen capture - but "correctly timecoded"/ with unjittered framerate (with a stable period); and with possibility to obtain it as uncompressed (or lossless) image sequence? Briefly - I have a typical problem that I am faced with: I sometimes develop hardware, and want to record a video that shows both commands entered on the PC ('desktop capture'), and responses of the hardware ('live video'). A chunk of an intro

Android 2d canvas game: FPS Jitter problem

Deadly 提交于 2019-12-02 16:26:38
I based my game off of the lunar lander demo, although heavily modified, and I can get around 40-50fps but the problem is it fluctuates between 40-50fps so much that it causes the moving graphics to jitter! Its very annoying and makes my game look really shitty when in fact its running at a good frame rate. I tried setting the thread priority higher but that just made it worse... now it will fluctuate between 40-60fps... I was thinking of limiting the FPS to about 30 so that it will be constant. Is this a good idea and does anyone else have experience or a different solution? Thanks! This is

Generate a 2-fps mp4 from images using FFMPEG

社会主义新天地 提交于 2019-12-02 12:48:07
Need to create a video from a series of images. The video needs to have a low frame rate. This is the command I use to create the video. ffmpeg.exe -r 2 -i images/%3d.jpg -vcodec libx264 -pix_fmt yuvj420p output.mp4 The problem is that, while the video works just fine when played through a HTML5 video, it doesn't really work when the file is downloaded locally and played through either the Windows 10 default video player or even VLC (weirdly, the default video player works better). Can anyone explain why this is happening and possibly how to fix the issue? Some players, like VLC, don't like

Is it possible to read webcam frames in parallel?

百般思念 提交于 2019-12-02 11:29:32
I have a simple Python script that captures a webcam using OpenCV . My webcam has the potential to stream 30 FPS, but since my Raspberry Pi isn't powerful enough, I can only read ~ 20 FPS. When running the script, one core of my CPU is maxed to 100%, but the the rest of the cores are untouched, so I am trying to split up the reading into the most threads I can in order to use my CPU to it's maximum potential and easily reach 30 FPS. So is it possible to read webcam frames in parallel? This is my attempt: import numpy as np import cv2 import time from threading import Thread CV_CAP_PROP_FPS = 5

Regulating the number of executions per second using JavaFX

寵の児 提交于 2019-12-02 09:36:31
So as of right now I'm implementing Conway's Game of Life using JavaFX. In a nutshell, in my class extending AnimationTimer, within the handle() method, it traverses through every cell in a 2D array and updates each position, then draws to the canvas using the information in the 2D array. This works completely fine but the problem is it runs far too fast. You can't really see what's going on on the canvas. On the window I have the canvas as well as a few buttons. I added a Thread.sleep(1000) to try to regulate a generation/frame per second, but doing this causes the window to not detect the

Verifying sent packets on real time network using SFML

孤者浪人 提交于 2019-12-02 04:03:47
问题 I am building a networkable program that transfers graphical changes on a 2D screen with SFML UDP libraries. I want to run close to all of the processing on the host server, and only send the graphic updates and command return values to the client. I want to make a verify condition before the data is sent to the screens on both sides of the connection. I was thinking about sending a single byte as either 0 or 1 to represent successful reception of the data and to synchronize. (see diagram)

Verifying sent packets on real time network using SFML

。_饼干妹妹 提交于 2019-12-02 02:42:55
I am building a networkable program that transfers graphical changes on a 2D screen with SFML UDP libraries. I want to run close to all of the processing on the host server, and only send the graphic updates and command return values to the client. I want to make a verify condition before the data is sent to the screens on both sides of the connection. I was thinking about sending a single byte as either 0 or 1 to represent successful reception of the data and to synchronize. (see diagram) Server-------( updates )----->Client | | ( wait for )<---( 1 or 0 )-----Send Byte | | ( if 1 ) ( if byte