video

问题 I'm building a website that has to achieve the AA Conformance to WCAG. We are going to provide videos and to do it right there has to be a transcript of this video, my question is, in html were is the correct order to put this transcript before, after. there is a valid tag to comply this. Thanks for your time. 回答1: Ideally, the transcript should be placed before the video. There is no tag specifically for transcripts - you will need to mark up the speech and descriptions using paragraph tags

问题 I'm building a website that has to achieve the AA Conformance to WCAG. We are going to provide videos and to do it right there has to be a transcript of this video, my question is, in html were is the correct order to put this transcript before, after. there is a valid tag to comply this. Thanks for your time. 回答1: Ideally, the transcript should be placed before the video. There is no tag specifically for transcripts - you will need to mark up the speech and descriptions using paragraph tags

问题 I need to merge multiple video files (with included audio) into a single video. I've noticed xfade has been recently released and used it but I am running into an audio sync issue. All videos are in the same format / resolution / fame and bitrate / etc both for video and audio. Here is what I am using to merge 5 videos of various durations with 0.5 crossfade transitions: ffmpeg \ -i v0.mp4 \ -i v1.mp4 \ -i v2.mp4 \ -i v3.mp4 \ -i v4.mp4 \ -filter_complex \ "[0][1]xfade=transition=fade

问题 I am needing to download a video that is sourced from an HTML5 element. The issue is that I want the download button to be more visible. <video controls disablepictureinpicture> <source src="https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4"> </video> <a href="https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4" download> Download Video (not functional) </a> This code provides two download buttons. One hidden in the button menu of

问题 Hello Stackoverflow community! I dread having to ask questions, but there seems to be no efficient way to take a single input video and apply a matrix transformation/split the video into equal sized pieces, preferably 4x4=16 segments per input. I tried using all the libraries such as ffmpeg and mencoder, but having 16 outputs can be as slow as 0.15x. The goal of my project is the split the video into 16 segments, rearrange those segments and combine back into a final video; later reversing

问题 Hello Stackoverflow community! I dread having to ask questions, but there seems to be no efficient way to take a single input video and apply a matrix transformation/split the video into equal sized pieces, preferably 4x4=16 segments per input. I tried using all the libraries such as ffmpeg and mencoder, but having 16 outputs can be as slow as 0.15x. The goal of my project is the split the video into 16 segments, rearrange those segments and combine back into a final video; later reversing

问题 Hello Stackoverflow community! I dread having to ask questions, but there seems to be no efficient way to take a single input video and apply a matrix transformation/split the video into equal sized pieces, preferably 4x4=16 segments per input. I tried using all the libraries such as ffmpeg and mencoder, but having 16 outputs can be as slow as 0.15x. The goal of my project is the split the video into 16 segments, rearrange those segments and combine back into a final video; later reversing

问题 I've been working on a c++ interface to capture images from all types of webcams via the Micrsoft Media Foundation. I've already got a bit of code that can connect with several types of webcams and is able to capture images in different resolutions and formats. I know that under WinXP it is possible to change different parameters of the webcam (like white balance, exposure time e.g.) by using the Direct Show library. Unfortunately the interface in the Direct Show library that made it possible

问题 I'm attempted to stream an already recorded video file to twitch servers using FFMPEG but I only get audio so far no video. I've tried several settings, and different files (avi,etc) but I still get audio only. Here is my FFMPEG settings: ffmpeg -re -i test.mp4 -vcodec libx264 -preset fast -crf 30 -acodec aac -ab 128k -ar 44100 -strict experimental -f flv rtmp://live-dfw.twitch.tv/app/"TWITCHKEY" Has anyone nailed this? I'm using ffmpeg 0.8.17-6:0.8.17-1 under Ubuntu. 回答1: ffmpeg -re -i ~

问题 The width=100% height="auto" scales my videos to fit the whole width of the browser window, but if the height of the window is lower than the aspect ratio the video gets cropped in height. I want the video to scale to fit either width or height so that I can always see the whole video without crop, filling the closest ratio (adding empty space to sides if window ratio is lower). I can't figure out how to do this however. First any height value, % or px, seems to be disregarded, I can't set