Stack Overflow
Stack Overflow

Questions tagged [webm]

WebM is an open video encoding standard by Google. It consists of video streams compressed with the VP8 or VP9 video codec, audio streams compressed with the Vorbis or Opus audio codecs, and WebVTT text tracks. It may contain alpha planes for transparency.

For the purposes of the video tag introduced by HTML5, there was a need for an open (royalty-free) video codec which could be incorporated into free open source projects. WebM is Google's answer to this challange. An other possibility is Theora (also royalty-free).

Other vendors are voting for H.264 (mostly Apple and Microsoft), for which they already bought the licenses to incorporate into their web browsers.

633 questions
0
votes
1 answer

format unknown error with ffmpeg

I'm trying to convert .webm to .mp4 using : ffmpeg -fflags +genpts -i 1.webm -r 24 1.mp4 it doesn't work , this is what I get : C:\Users\mahmoud\Desktop\ffmpeg>ffmpeg -fflags +genpts -i v.webm -r 24 1.mp4 FFmpeg version SVN-r18639, Copyright (c)…
Rambo Actionha
  • 115
  • 7
0
votes
0 answers

How convert webm to mp4?

I am unable to convert a webm file created through webcam recording to mp4. I am using below command. ffmpeg -fflags +genpts -i uploads/2586913190845018.webm -r 24 uploads/abc.mp4 2>&1 The output of above command is Array ( [0] => FFmpeg…
Ravi Shankar
  • 1,559
  • 1
  • 11
  • 15
0
votes
1 answer

Is it possible to record a .webm file using gstreamer?

I'd like to record a .webm file beside my main .mkv file to serve, that .webm file, to a video object on html page to read from (kind of simple streaming just to see what it's recording) I'm using pipeline below (with tee for this purpose) to record…
Sina Sh
  • 1,177
  • 3
  • 15
  • 24
0
votes
1 answer

Can I programmatically insert audio from a Webm file into another Webm file?

I have two WebM files, both have video and audio. I want to insert the audio from one WebM file into the other so that the final WebM file has two audio "streams" playing simultaneously with the video. Is it possible to achieve this programatically?…
andy
  • 8,775
  • 13
  • 77
  • 122
0
votes
0 answers

C# Directshow Stream Filter

I'm using DirectShow .NET to capture WebM Videos. The Graph looks like this: My question is, how can i use the "preview" pin from VP8 encoder to stream a preview video? Is there any (free) DirectShow filter available for this job? Or is the…
infler
  • 41
  • 4
0
votes
1 answer

ffmpeg how to calculate size from webm to mp3 without conversion

Im using the Linux command "ffmpeg", and i was wondering if there is a solution to calculate theoretically (simulate the conversion) the size without making the conversion from .webm file into .mp3 160k. Is there a formula or something like that,…
Youssef
  • 401
  • 1
  • 5
  • 23
0
votes
1 answer

Read contents of Initialization range and SegmentBase indexRange in a DASH stream

I have been trying to understand how DASH works, mainly the MPD and how a remote client boots-up to play a stream. Of many parameters in the MPD, the Initialization range and SegmentBase indexRange seems to be of much interest. If I understand it…
jamie
  • 89
  • 4
  • 11
0
votes
1 answer

Webm (VP8 / Opus) file read and write back

I am trying to develop a webrtc simulator in C/C++. For media handling, I plan to use libav. I am thinking of below steps to realize media exchange between two webrtc simulator. Say I have two webrtc simulators A and B. Read media at A from a input…
Austin
  • 1,709
  • 20
  • 40
0
votes
1 answer

FFMpeg Compress WebM - VP9 with alpha channel

I'm looking for a way compress a quicktime .mov in animation format with alpha to VP9. I've tried the following: ffmpeg -i Elephant_01.mov -vcodec libvpx-vp9 -pix_fmt yuva444p output3.webm but I get an incompatible pixel format... error. any…
Britton Peddie
  • 39
  • 1
  • 5
0
votes
1 answer

Ffmpeg performance issue when transcoding to webm

I have recently updated ffmpeg from version 2.0.2 to the most recent release 2.7. I installed it using the same building configuration as the old version and the same codecs version (libvpx and h264). When I tried to transcode an mp4 video to webm,…
Algold
  • 953
  • 8
  • 10
0
votes
1 answer

how to convert mp4 to webm file using ffmpeg in php on centos

i have done installation. after then i have using following code to convert mp4 to webm using ffmpeg on centos. but it does not convert and also didn't throw any error.what is wrong with my code else am i forgot anythink in installation. Thanks…
intrepid web
  • 1
  • 3
0
votes
0 answers

What is the support of transparent HTML5 videos in browsers?

I need to use this for a project. I don't intend to support any old browser, but this is quite a feature and I have a close-to-the-same fallback for it, so I would like to know in which browsers I should apply this.
User
  • 51
  • 3
0
votes
0 answers

FFserver error: sample rate not set

I'm trying to stream video with FFmpeg over FFserver to a webbrowser. FFmpeg is running on Windows and FFserver on Ubuntu. The streaming from FFmpeg to FFserver is working, but I get the following error when accessing the stream from a…
Mese
  • 69
  • 1
  • 7
0
votes
1 answer

Can WebM contain FLAC audio?

So can a WebM video contain FLAC audio?
Brandon
  • 259
  • 1
  • 3
  • 12
0
votes
1 answer

Recording Webm format in android mediarecorder settings or camprofile tweaking?

It may seem a dumb question, I have been working on this all night and could not get a webm video recorded from my mobile. mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); …
Chetan
  • 56
  • 6
1 2 3
…
42 43