Super User Stack Exchange
Super User Stack Exchange

Questions tagged [webm]

Sponsored by Google, WebM is a new protocol used to convert audio/video files to HTML 5 compliant feeds.

The WebM audio/video format is one of the latest file formats announced for HTML 5 video conversion and feed compliance. To help remove the reliance on Flash based video feeds, Google, and other companies, have sponsored the development of WebM in the hopes it will become one of the new defacto standards for HTML5.

Browser that natively support WebM include:

  • FireFox 4 +
  • Opera 10.6 +
  • Google Chrome (native)

Safari on MacOSX, unfortunately does not fully support WebM, as it uses QuickTime to convert and encode/play audio/video files on the Macintosh.

71 questions
69
votes
2 answers

What does Matroska have which WebM doesn't, that made the differentiation necessary?

I've read that WebM is essentially a subset of the Matroska format. What does Matroska support that WebM doesn't, which necessitated "christening" a new format rather than just saying "WebM = Matroska with a restricted set of codecs used"? I'm…
einpoklum
  • 8,783
  • 20
  • 84
  • 153
35
votes
4 answers

Lossless extraction of streams from WebM

I would like to extract streams from WebM video files without converting them (re-compression), can somebody recommend any software that can allow this?
Karolinger
  • 961
  • 4
  • 19
  • 26
27
votes
3 answers

What's the easiest way to save a GIFV as a simple GIF?

Usually I open the context menu right clicking on the image. Now theres no option for "save image as", just options for the WEBM/MP4 format.
Herr_Schwabullek
  • 455
  • 1
  • 6
  • 13
21
votes
2 answers

How do I convert webm to mp4 for MacOSX?

I'm on MacOSX Lion and would like a method for converting webm to mp4 (or another iTunes compatible format). ffmpeg seems like a possibility but the documentation is a bit obtuse for me; step-by-step directions would be appreciated.
Son of the Wai-Pan
  • 2,359
  • 4
  • 21
  • 30
19
votes
1 answer

Converting video to WebM with ffmpeg/avconv

While trying to optimize the size of my home videos I converted some of them to WebM as a test, using Pitivi on Xubuntu. The size difference is significant. The resulting webm-file is only around 10% of the original file, while the picture quality…
jeroen
  • 455
  • 1
  • 5
  • 11
16
votes
0 answers

Extracting Opus from WebM losslessly with FFmpeg or MKVToolNix

I have come across a strange problem when remuxing Opus audio stream from WebM to another container like ogg or opus. Running the output files through a spectrum analyzer clearly shows that there is loss/change in the data. I'm not sure if the…
alexitx
  • 191
  • 1
  • 6
14
votes
1 answer

What bunch of ffmpeg scripts do I need to get HTML5-compatible "Video for everybody"?

What list of commands should I do in ffmpeg/mencoder/some_other_CLI_app to get a video in all the right formats to use Video for Everybody? i.e. Is there a subtlety that prevents there being a mechanical tutorial that…
John Baber-Lucero
  • 809
  • 3
  • 10
  • 16
13
votes
1 answer

Does WebM have its own delivery method? How does it relate to RTMP and HTTP Live Streaming?

When I read up on streaming media formats and packaging methods, I am confused by the way WebM is described as mutually exclusive to RTMP and HTTP Live Streaming. From my understanding, WebM is a video format, like a way of encoding a video file,…
Colin Brogan
  • 249
  • 1
  • 2
  • 5
9
votes
3 answers

Joining webm videos under Linux

How can I concatenate several .webm files (e.g. downloaded from youtube) into a single file? I've tried a simple cat followed by "mencoder -forceidx -oac copy -ovc copy ..." - didn't work. I'm using Linux.
eug
  • 874
  • 8
  • 12
9
votes
1 answer

FFmpeg - convert WebM/Opus to WAV or FLAC in single step?

I want to create WAV and FLAC audio files from WebM files with Opus audio streams, and I want to do so without further degrading the audio. I am currently using a 2-step process as follows (WAV example show): ffmpeg -i "file.webm" -vn -acodec copy…
bryman79
  • 201
  • 1
  • 2
  • 4
9
votes
1 answer

Is it ok to rename webm (audio-only) files to .opus?

For .webm files obtained with youtube-dl -f bestaudio containing no video stream, is it preferable to run ffmpeg -i input.webm -vn -c:a copy output.opus or can one simply rename the source file, changing the extension? I mean, the audio stream is…
Marc.2377
  • 1,457
  • 4
  • 23
  • 51
8
votes
1 answer

IE will not seek audio/webm file

I'm trying to create a WebM audio file that will play back and seek in all browsers using the HTML5
bunkowm
  • 81
  • 2
8
votes
2 answers

WebM on Mac OS X

What options are there for playing WebM video files on Mac OS X other than VLC? A plugin to Quicktime Player would be perfect.
Daniel Beck
  • 109,300
  • 14
  • 287
  • 334
6
votes
2 answers

In which format to store home made videos

TL;DR: my home videos are taking up too much space and are impractical to backup on Dropbox. Which format do you advice to convert them to? Long version: One year ago I bought a new compact camera (Canon SX230HS), so I could make nicer pictures and…
jeroen
  • 455
  • 1
  • 5
  • 11
5
votes
3 answers

Conversion from WebM to MP4 in Ubuntu is slow and bad quality

I have used the command ffmpeg -i input.webm -q:v 10 -c:a copy out.mp4 I also tried using avconv instead of ffmpeg. The conversion is successful but the quality is bad. Also it takes a lot of time. It also does not play with Windows Media Player.…
dfordevy
  • 137
  • 1
  • 2
  • 9
1
2 3 4 5