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

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56 views

Video is not playing on any of browsers

When I am trying to open Google Material Design Spec and click on play button nothing happens. Checked on Chrome, Opera, Firefox. When I am trying to open video url directly, first time - it ...
2
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0answers
197 views

FFmpeg “ass” filter not working

I'm haveing a bit of a problem when trying to use FFmpeg. I've mostly been using it to extract clips from videos and such. However, I've been trying to get some subtitles embedded (hardsubs) into the ...
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1answer
70 views

FFmpeg error when doing first pass of WebM encoding: Unrecognized option 'auto-alt-ref'

I'm using OS X Mavericks (10.9.4) and installed ffmpeg from homebrew. When executing this command (assuming input file exists): ffmpeg -i ololo.wmv -vf scale=500:-1 -auto-alt-ref 1 -lag-in-frames 20 ...
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0answers
46 views

VLC media player renders WEBMs with random start time

I am rendering two video types out for HTML5 video playback... one is a webm and the other is mp4. The mp4 is showing a start time of 00:00:00 seconds (like you'd expect). But the webm is getting a ...
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0answers
470 views

Why is FFMpeg not giving my webm file webvtt subtitles?

Okay, so I tried this command >ffmpeg -i ../swc.webm -i ../subs.vtt -scodec WebVTT -loglevel verbose subtitl ed.webm And got this error: ffmpeg version N-62235-ga7a82f2 Copyright (c) ...
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0answers
154 views

Why does FFmpeg segment_times create webm files with incorrect duration and start times?

I have a MOV file that I want to split into several smaller files (at certain timestamps in a comma-separated list). I'm simultaneously compressing the video into WEBM files. The command I'm using ...
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0answers
92 views

error while merging videos with ffmpeg

I am trying to concat videos with different resolutions using ffmpeg and I am encountering this error shown below while that the video resizes when playing the videos I merge them using ffmpeg with ...
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546 views

How do I split a WebM file without re-encoding?

I have this WebM file that I need to split, but I'd like to do it without re-encoding. Putting it in an MKV container doesn't work, because the point where I need to split it is not a keyframe, so it ...
2
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1answer
712 views

Merge segments from different videos ffmpeg

Could I use ffmpeg to make one video which takes different segments from different videos? 1.webm, 2.webm, 3.webm, 4.webm Those are my 4 video files. I want the 10 seconds from each video. The ...
3
votes
1answer
557 views

How do you combine multiple ffserver streams into a grid in real time?

I'm trying to set up a CCTV system with ffmpeg/ffserver/zoneminder and want a nice looking 4x4 grid without all the Java applet borders and window dongles on it, just a full screen 4x4 grid. I've ...
11
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1answer
9k views

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% ...
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2answers
1k views

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 ...
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vote
1answer
143 views

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 ...
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2answers
392 views

Seek Issues in WebM (VP8 IVF/OGG) File

I have a file downloaded from the web this is the media below. General Format : WebM Format version : Version 2 File size ...
4
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1answer
2k views

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 ...
2
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1answer
1k views

Transcode videos to webm with lossless compression

I am using GNU/Linux(Arch Linux), and i need to transcode some videos from .avi/.mov to .webm. I don't have the original file for most videos, only the "very compressed" .avi, and i can't loose any ...
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1answer
204 views

How to make YouTube search results to be of webm format in Firefox?

In Google Chrome there is an extension that add &webm=1 in all YouTube search URIs. I did not find an alternative add-on in Firefox, any alternative methods? Thanks.
2
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1answer
2k views

mkvmerge error “formats do not match” when appending oga files

we're using mkvmerge to concat user uploaded audio into a single file (this is all done from code in a django website). The command line looks like mkvmerge -o /path/to/output.webm -w ...
7
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1answer
2k views

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 ...
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2answers
1k views

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 ...
9
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2answers
4k views

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?
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0answers
94 views

Encoding to WebM and OggVorbis without changing original dimensions?

Trying to convert original Quicktime.movs to both WEbM and OggVorbis-Theora formats. Was using the free Miro video converter but when it converts it always uses preset sizes. Is there any way of ...
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1answer
969 views

Why are my WebM files larger than OGG and MP4 versions?

I have some OGG and MP4 files and I am converting them WebM for use on my website. I have used VLC to convert to WebM. What I have noticed is the WebM file is 8MB while the MP4 and OGG are around ...
4
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1answer
1k views

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.
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2answers
3k views

Working FFMPEG settings for converting to WebM format?

Can anyone give me working settings for converting video to WebM with ffmpeg? I am on Windows 7 with the FFmpeg git-67f5650 64-bit Static (Latest) build from http://ffmpeg.zeranoe.com/builds/ I've ...