webm | 易学教程

html 的一些标签

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HTML 5 <section> 标签定义文档中的节（section、区段）。比如章节、页眉、页脚或文档中的其他部分。 <section> hello world! </section> <video> 标签 <video> 是 HTML 5 中的新标签。 <video> 标签的作用是在 HTML 页面中嵌入视频元素。以下 HTML 片段会显示一段嵌入网页的 ogg、mp4 或 webm 格式的视频：最好的 HTML 解决方法 HTML 5 + <object> + <embed> <video width="320" height="240" controls="controls"> <source src="movie.mp4" type="video/mp4" /> <source src="movie.ogg" type="video/ogg" /> <source src="movie.webm" type="video/webm" /> <object data="movie.mp4" width="320" height="240"> <embed src="movie.swf" width="320" height="240" /> </object> </video> 上例中使用了 4 中不同的视频格式。HTML 5 <video> 元素会尝试播放以 mp4

not all webm files are playing in firefox

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问题 I have coded webm videos with Miro Video Converter and also with FreeMakeVideo Converter with the same result: some webm videos play in Firefox while others won't when embedded with the html5 video tag. In Chrome they ALL play correctly. In my Apache configuration I have added: AddType video/webm .webm I have also added a .htaccess file with the same: AddType video/webm .webm Doesn't make any difference. Some of the webm files play fine, while others don't play at all. If I open the webm

FFMPEG slow VP8 encoding

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问题 I am trying to encode video from my webcam into a VP8 stream. Sending a WebRTC stream from my webcam using Chrome looks pretty good and doesn't use a lot of CPU power. When I try to transcode my webcam stream to VP8 (webm) using FFMPEG then it's very, very slow. On OS X I use the following FFMPEG options to generate a VP8 webm file. The source is a 720p Facetime webcam. It drains my CPU usage (late 2011 core i7 MBP) and the quality isn't very good: ffmpeg -f avfoundation -i 'default' -y -qmin

VLC stream to MP4 WEBM and Flash

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I am trying to stream video from a IP Cam to my my Wordpress site. I would like my stream to be available via common devices Windows, Mac, Android and IOS. Currently I am using VLC to stream,but I can only get a flash stream to work but I would like to do FLV, MP4 and webm. What player should I use to display the MP4 and webm video on the site? Also I don't think the calls to VLC are correct cause I can't open the MP4 and webm stream in VLC on another computer, but I can open the flv stream. VLC Script: cd "C:\Program Files (x86)\VideoLAN\VLC" vlc -vvv -I dummy http://IP/cgi/mjpg/mjpg.cgi

Media Source Extensions appendBuffer of WebM stream in random order

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问题 I am trying to achieve video downloading in parallel from multiple sources. However MSE appendBuffer method always fails when not following sequence order of video file. I would like to append parts in random order and play video "as soon as possible". I was exploring SourceBuffer mode property as well as timestampOffset. None of those were helpful. I am wondering if source webm file i have could be in "not supported format" for such a task (sequential approach works fine). source video file

How to? Creating a webm video from kinect data for three.js example webgl_kinect

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问题 http://mrdoob.github.com/three.js/examples/webgl_kinect.html How one creates a kinect webm movie to play in the above example, specifically, how one does it from an kinect oni file or a kinect point cloud? Approach, language, os are not important. Thanks. 回答1: Alongside kinect.webm you'll find kinect.nfo where I wrote some notes with links on how it was recorded. 来源： https://stackoverflow.com/questions/15457765/how-to-creating-a-webm-video-from-kinect-data-for-three-js-example-webgl-kinect

Combining implementation of autobahn websockets, gstreamers and html5 mediaSource API

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I am running a websocket server using autobahn|python. on the server side, I also have a gstreamer pipeline running which I am using to capture webm frames using "appsink". The gstreamer pipeline that is implemented is: gst-launch-1.0 v4l2src ! video/x-raw,width=640,height=480 ! videoconvert ! vp8enc ! webmmux ! appsink name="sink" Everytime, I receive a buffer in the appsink, I send it over a websocket as a binary "message" using sendMessage. def on_new_buffer(appsink): global once gstsample = appsink.emit('pull-sample') gstbuffer = gstsample.get_buffer() frame_data = gstbuffer.extract_dup(0

How to create a MPD file of MPEG-DASH to play a webm video?

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问题 I'm following this demo which uses mediaSource API and MPEG DASH standard to play a .webm video. This is the MPD file used: <?xml version="1.0" encoding="UTF-8"?> <MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:mpeg:DASH:schema:MPD:2011" xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011" type="static" mediaPresentationDuration="PT888.05S" minBufferTime="PT1S" profiles="urn:webm:dash:profile:webm-on-demand:2012"> <Period id="0" start="PT0S" duration="PT888.05S" >

Playing webm chunks as standalone video

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I've built some code that will get the MediaRecorder API to capture audio and video, and then use the ondataavailable function to send the corresponding webm file blobs up to a server via websockets. The server then sends those blobs to a client via websockets which puts the video together in a buffer using the Media Source Extension API. This works well, except that if I want to start a stream partway through, I can't just send the latest blob because the blob by itself is unplayable. Also, if I send the blobs out of order the browsers usually complain that the audio encoding doesn't match up

MP4视频格式如何快速转换成WEBM格式

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现在网络上都有很多查找视频资源的网站和工具，而且大部分网站和工具都是提供MKV视频格式和MP4视频格式的。网上还会出现一种一种视频格式，WEBM视频格式。这个WEBM格式画面清晰而且比特率也比较低。也就是说同样参数的视频文件，可能WEBM格式的视频会占用更小的内存。所以今天教大家如何把MP4视频格式快速转换成WEBM视频。下面使用两种方法转换视频格式：第一种：修改后缀名 1、最简单的方法就是直接修改名称。但是这个方法并不是所以的格式都可以这么做，有些修改后会打不开。选择MP4视频然后右键重命名将MP4格式改成WEBM格式即可。第二种：专业的视频转换器 1、在使用专业的视频转换器之前还是需要先安装软件的。在迅捷视频官网中把迅捷视频转换器的安装文件下载到本地，然后需要设置安装的位置，然后就可以点击立即安装了。不然就会安装到C:\Program Files (x86)\videconverter路径中。 2、然后就是打开软件进行下一步的操作了。可以看到有很多的功能提供给我们使用和操作的。不过这里需要转换视频的格式，所以直接点击视频转换，然后进入其对应的转换页面中。至于其他的功能之后可以使用的。 3、然后就可以看到空白一片的操作界面，现在就需要把MP4视频添加到软件中了。点击添加文件按钮然后选择下载完成的MP4视频导入其中。或者使用添加文件夹的方法以及拖拽视频也能够完美导入视频文件。