webm

Convert mov with Alpha to VP9 Webm with Alpha Using ffmpeg

由 谁说胖子不能爱 提交于 2019-11-28 00:16:23
I am trying to convert a mov with alpha transparency to webm with alpha transparency, as seen here . I followed the steps explained here to no avail. From this answer I was able to remove all the black in the video, thus making it transparent but this is not what I need as I already have a transparent mov and would like to convert that to transparent webm format. ffmpeg -i input.mp4 -c:v libvpx -vf "colorkey=0x000000:0.1:0.1,format=yuva420p" out.webm This is the ffprobe output of the video I would like to convert to webm with transparency. built with Apple LLVM version 7.0.2 (clang-700.1.81)

Is it possible to merge multiple webm blobs/clips into one sequential video clientside?

由 北战南征 提交于 2019-11-27 14:13:14
问题 I already looked at this question - Concatenate parts of two or more webm video blobs And tried the sample code here - https://developer.mozilla.org/en-US/docs/Web/API/MediaSource -- (without modifications) in hopes of transforming the blobs into arraybuffers and appending those to a sourcebuffer for the MediaSource WebAPI, but even the sample code wasn't working on my chrome browser for which it is said to be compatible. The crux of my problem is that I can't combine multiple blob webm clips

webm to mp4 conversion using ffmpeg

由 六眼飞鱼酱① 提交于 2019-11-27 09:21:21
问题 When I try to convert a webm file to mp4 the output is very very choppy and it appears as if many frames have been dropped by ffmpeg I used the following commands to convert ffmpeg -i movie.webm movie.mp4 ffmpeg -i movie.webm -vcodec libx264 movie.mp4 ffmpeg -i movie.webm -vcodec libx264 -qscale 0 movie.mp4 All of them have the same problem. When I use ffprobe it seems to show the frames more or less properly. UPDATE: built on Jun 14 2013 14:31:50 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)

Encoding FFMPEG to MPEG-DASH – or WebM with Keyframe Clusters – for MediaSource API

由 荒凉一梦 提交于 2019-11-27 00:30:51
问题 I'm currently sending a video stream to Chrome, to play via the MediaSource API. As I understand it, MediaSource only supports MP4 files encoded with MPEG-DASH, or WebM files that have clusters beginning with keyframes (otherwise it raises the error: Media segment did not begin with keyframe). Is there any way to encode in MPEG-DASH or keyframed WebM formats with FFMPEG in real-time? Edit: I just tried it with ffmpeg ... -f webm -vcodec vp8 -g 1 so that every frame is a keyframe. Not the

Convert mov with Alpha to VP9 Webm with Alpha Using ffmpeg

由 孤街浪徒 提交于 2019-11-26 21:40:28
问题 I am trying to convert a mov with alpha transparency to webm with alpha transparency, as seen here. I followed the steps explained here to no avail. From this answer I was able to remove all the black in the video, thus making it transparent but this is not what I need as I already have a transparent mov and would like to convert that to transparent webm format. ffmpeg -i input.mp4 -c:v libvpx -vf "colorkey=0x000000:0.1:0.1,format=yuva420p" out.webm This is the ffprobe output of the video I
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