video-processing

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . later this year I'm going to have a lot of time on my hands, and I thought I'd start a "small" project for myself and release it as open source. I'd like to code my own Fraps alternative. (or continue with Taksi http://taksi.sourceforge.net ). Fraps is a video & sound recording programm, which captures the

问题 i am currently placing 2 videos side by side in FFMPEG. Here is the command: ffmpeg -i input.mov -vf "[in] scale=1280:720, pad=2*1280:720 [left]; movie=right.mov, scale=1280:720 [right]; [left][right] overlay=1280:0 [out]" -b:v 1000k -vcodec libx264 -an sidebyside.mp4 I now need to manage the audio. I keep trying to specify: -acodec libfaac -ac 2 -map 0:1 -map 0:2 to take the 2 audio channels from the first input and use them. I keep getting the error: [aformat @ 0x7febf2e01fc0] auto

问题 I am working on a video processing project and using ffmpeg for watermarking. I achieve exactly what i want but the problem is that the process is very very slow. I am using a Intel Smart 2nd gen family Core-i5 Processor with 4GB RAM on a 32 bit operating system Microsoft Windows-8 on a 64-bit CPU. I tried watermarking a video [mp4] of length 1:30 Min. size of file is 1.5GB Whole process accomplish in 3 Hrs to watermark my video file and what i noticed while process is that ffmpeg was

问题 I am concatenating two mp4 videos. The problem is that first video (intro.mp4) lasts 5 seconds, second video (output.mp4) lasts 2 seconds and video created by concatenating them lasts 9 seconds (and should last 5+2 = 7 seconds). In final.mp4 video the last frame from first video (intro.mp4) i shown for additional 2 seconds before second video (output.mp4) is played. It looks like a lag when watching video. What I am doing wrong? list.txt: file 'data/intro.mp4' file 'output.mp4' command: ./bin

问题 I have a video of a welding procedure, and for every frame I need to take all the contours of the welded area, and detect all the edges. Unfortunately, the images I got aren't the best quality, I tried to put several filters and make image enhacement and it didn't work to take the sharp edges. Image Below: I managed to make the following code, but the results were terrible. clc clear all vid = VideoReader('home/simulation/V6_008.avi'); h=ones(3,3)/9; for i=1 : mov.NumberOfFrames thisframe =

问题 Can I discover byte length of each video(I,P,B) and audio frame in MPEG2 TS file not reading frame content byte by byte (from NAL unit header for example)? 回答1: in MPEG-TS files, in the PES layer, there is a field called "PES length" which includes all the data but without the PES headers. To extract this information accurately you must understand if there is a PES header per frame or not. Alas, in video mostly, this field is often left 0, and the only true way to count the bytes per frame is

问题 I've been searching for this for a few days now, but nothing seems to quite answer or work for me, so please forgive me if I'm asking a stupid question or one that seems to have been answered elsewhere. I have an AVI file encoded using the GMP4 video codec, currently installed on my computer so I can PLAY the file in Windows Media Player for instance. What I'm trying to do is open/decode the file for editing purposes, in order to be able to stitch two video files together. I do not require it

问题 I'm looking for ways to stream data from an webgl or canvas element, being rendered on client browser, to a remote rtmp server - live. Any help would be highly appreciated. 来源： https://stackoverflow.com/questions/40830341/stream-data-to-rtmp-server-from-webgl-or-canvas

问题 Does know any python video editing/processing libraries or frameworks that work with Google App Engine? I need to pro grammatically edit video files (adding a soundtrack, layering video clips on top etc.) on my App Engine site. 回答1: With most video/audio codecs written in C for maximum portability, and any muxing libraries being written in C for speed working with large byte streams, finding these features in pure python libraries is going to be difficult. If you could tie yourself down to

问题 I have a java program that runs a webcam and capture images with the use of opencv libraries. My camera is working and eventually stops taking frames. It throws an exception. Exception in thread "Thread-11" java.lang.Exception: unknown exception at org.opencv.highgui.VideoCapture.read_0(Native Method) at org.opencv.highgui.VideoCapture.read(VideoCapture.java:341) at projectana.VideoThread.run(VideoThread.java:59) at java.lang.Thread.run(Thread.java:745) Here is my code: (VideoThread.java)