webm

PCM support in WebM, and Chrome's WebM implementation

由 家住魔仙堡 提交于 2020-07-03 07:30:25
问题 Does WebM support PCM for the audio codec? I didn't think it did, but I see on the WebM documentation page that there is support for a BitDepth field with the following comment: BitDepth - Bits per sample, mostly used for PCM. If WebM does support PCM, does Chrome's implementation? And if it does, what is the appropriate content type for use with MediaRecorder? These all return false: MediaRecorder.isTypeSupported('video/webm;codecs=h264,pcm'); MediaRecorder.isTypeSupported('video/webm;codecs

Webm file could not play when MediaRecorder on Chrome does not provide the cluster?

由 ぃ、小莉子 提交于 2020-06-29 05:15:13
问题 Background : I need to play each webm file individually which are created by MediaRecorder According to Brad’s suggestion, we need to split the data on the cluster element 0x1F43B675 , and prepend everything before the first cluster to a later cluster I have splitted the data on cluster instances, and made a webm file with header(data before first cluster) and splitted data. For this what I am doing inside the ondataavailable of MediaRecorder API, // below statements would be executed from

How can I use transparent webm for Android?

由 删除回忆录丶 提交于 2020-06-29 03:54:11
问题 I am trying to use some video resources. And I wanna get rid of the background and change the color as I want. I used VideoView for easy implementation. However, it gave black background. I don't want that. So, I am trying to use TextureVideoView. implementation 'com.sprylab.android.texturevideoview:texturevideoview:1.2.1' However, when I play the webm files, it seems it's not transparency. What's the reason??? It's weird because I also exported and played a few clips to Webm with alpha

How to play WEBM files individually which are created by MediaRecorder

由 霸气de小男生 提交于 2020-06-22 03:36:50
问题 For recording audio and video, I am creating webm files under the ondataavailable of MediaRecorder API. I have to play each created webm file individually. Mediarecorder api inserts header information into first chunk (webm file) only, so rest of the chunks do not play individually without the header information. As suggested link 1 and link 2, I have extracted the header information from first chunk, // for the most regular webm files, the header information exists // between 0 to 189 Uint8

How to play WEBM files individually which are created by MediaRecorder

由 天涯浪子 提交于 2020-06-22 03:34:25
问题 For recording audio and video, I am creating webm files under the ondataavailable of MediaRecorder API. I have to play each created webm file individually. Mediarecorder api inserts header information into first chunk (webm file) only, so rest of the chunks do not play individually without the header information. As suggested link 1 and link 2, I have extracted the header information from first chunk, // for the most regular webm files, the header information exists // between 0 to 189 Uint8

openCV - ffmpeg H264 and Webm error

由 你离开我真会死。 提交于 2020-05-28 14:22:38
问题 I have ubuntu 16.04 LTS and OpenCV 3.4.0 Installed(Intel i5 and AMD graphics card), I need to create a browser supported video, which is playable in browser. If I'm using H264 im getting OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 27 and format 'mp4 / MP4 (MPEG-4 Part 14)' OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1' [h264_nvenc @ 0x7f4e0407f5e0] Cannot load libcuda.so.1 Could not open codec 'h264_nvenc': Unspecified error if I'm using webm VP8 OpenCV: FFMPEG

openCV - ffmpeg H264 and Webm error

由 别等时光非礼了梦想. 提交于 2020-05-28 14:19:10
问题 I have ubuntu 16.04 LTS and OpenCV 3.4.0 Installed(Intel i5 and AMD graphics card), I need to create a browser supported video, which is playable in browser. If I'm using H264 im getting OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 27 and format 'mp4 / MP4 (MPEG-4 Part 14)' OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1' [h264_nvenc @ 0x7f4e0407f5e0] Cannot load libcuda.so.1 Could not open codec 'h264_nvenc': Unspecified error if I'm using webm VP8 OpenCV: FFMPEG

Create webm video blob from series of ArrayBuffer

由 ぐ巨炮叔叔 提交于 2020-05-24 05:07:48
问题 Here's my code to capture video stream and encode to webm (Using https://github.com/GoogleChromeLabs/webm-wasm): async function captureWebm() { console.log("Started webm capture") worker.postMessage("./webm-wasm.wasm"); await nextEvent(worker, "message"); console.log('webm worker loaded') worker.postMessage({ width: w, height: h, timebaseNum: 1, timebaseDen: 30, bitrate: 1500, realtime: true }); let encodeWebm = async function() { mCtx.drawImage(player, 0, 0, w, h); const imageData = mCtx

Allavsoft for Mac(视频下载工具) v3.22.5.7433

由 点点圈 提交于 2020-05-09 15:56:56
Allavsoft Mac中文破解版是mac上一款非常好用的视频下载工具，可以帮助用户快速进行视频在线下载和转换功能，支持从雅虎、YouTube、Facebook等多达100家的视频分享网站的影片下载功能。 地址： https://www.macw.com/mac/1035.html 功能特色 在Mac上下载免费视频文件 Allavsoft也是一款无所不能的Mac Video Downloader，支持从Facebook，Yahoo Video，Google Video，DailyMotion，eHow等各种视频分享网站下载视频。 下载1080p高清视频 一旦视频共享网络提供这种视频分辨率和质量，这个理想的视频下载器就可以下载具有最佳视频质量的网络视频，如下载高清1080p视频，下载4K视频和下载720p视频。 将视频下载到Apple ProRes，MP4，MOV，AVI等 这个一站式的Mac视频下载器可以从各种网站下载电影，无论原始格式是FLV，WebM，F4F，MP4，F4V，AVI，任何流行的视频格式，如下载视频到MP4，MOV，Apple ProRes，AVI， WMV，ASF，MPEG-1，MPEG-2，VOB，MKV，DV，3GP，RM，TS，SWF，FLV，OGV，WebM等。 将视频下载到Apple Lossless，M4A，WAV，MP3，AAC等

Supermap/Cesium 开发心得----本地视频接入播放

由 拈花ヽ惹草 提交于 2020-05-02 01:05:28
在三维中，为了增加现实感、给人一种带入感，我们会采取接入视频的方式来实现，那么如何接入视频呢？ 由于没有截至写文章为止，我没有视频流数据，所以只能采取本地视频文件的方式来做。 本文介绍结束视频的其中一种方法--------创建一个Entity实体作为承载视频的载体，将视频作为一种Entity的材质。 首先：在HTML中接入视频 < video id ="trailer" muted autoplay loop crossorigin controls > < source src ="LV.mp4" type ="video/mp4" > Your browser does not support the < code > video </ code > element. </ video > 这段代码中 muted标识让视频静音播放，本来这个组件设置的属性时静音、自动播放且循环，但是实际上当我把视频接入进来的时候却不自动播放，所以需要手动给他播放。 但是想要播放视频，不是所有的视频都是可以播放的，需要符合HTML5标准的视频格式和编码才能播放，我一开始也是MP4文件，但是却不能播放，后来才知道是视频编码的问题， MP4 MPEG 4文件使用 H264 视频编解码器和AAC音频编解码器 WebM WebM 文件使用 VP8 视频编解码器和 Vorbis 音频编解码器 Ogg Ogg
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