Fork me on GitHub

icon-48

Media Capture

A handy and reliable Firefox and Opera extension to capture media

small-image

Key Features

Media Capture is a lite weight Opera and Firefox extension designed to capture media files. Some key features are as following.

  • Extract audio stream from a video file
  • Combine (mux) audio and video streams together
  • Change audio volume up-down with FFmpeg

Frequently Asked Questions

How can I convert a video to audio file?

For your media conversion needs, it is recommend to use Media Converter and Muxer extension.

Alternatively, you can download FFmpeg Audio Extractor, then run the following command:

where "%input" is the input video file and "%output.mp3" is the converted file.

ffmpeg -i %input -q:a 0 %output.mp3

How to extract audio stream from a video file?

If you have Media Converter and Muxer installed, go to tab 2 and drag the file there.

Alternatively, download FFmpeg Audio Extractor according to FAQ [1], then run the following command:

where "%input" is the input video file and "%output" is the converted audio file.

ffmpeg -i %input -acodec copy -vn %output

How can I combine (mux) audio and video streams together?

Open Media Converter and Muxer, go to tab 3 and drag both video and audio files in the window.

Alternatively, download FFmpeg Audio Extractor according to FAQ [1], then run the following command:

where "%audio" is the audio stream, %video is the video stream, and "%output" is the output video file.

ffmpeg -i %audio -i %video -acodec copy -vcodec copy %output

How can I change the audio volume up and down with FFmpeg command-line tool?

To turn the audio volume up or down, you may use FFmpeg's Audio Filter named volume, like in the following example.

If you want the volume to be half of the input volume, run the following command:

ffmpeg -i %input -af 'volume=0.5' %output

What are the recommended online services to convert media files?

Here is the list of some recommended online services:

What are the recommended media players

We recommend these three media players: VideoLAN (VLC), Media Player Classic, and Foobar2000.

Why does MP3 conversion have a variable bitrate by default?

Variable bitrate (VBR) is a term used in telecommunications and computing that relates to the bitrate (amount of data) used in sound or video encoding. Usually, the higher the bitrate, the higher the audio or video quality is. As opposed to constant bitrate (CBR), VBR files dynamically vary the amount of data so higher bitrates are used for segments with rapidly changing video/audio, and lower bitrates are used for slower-changing parts. The average of these rates can be calculated to produce an average bitrate for the file. You can change this behavior using FFmpeg's settings. For a list of available options, see: Encoding VBR (Variable Bit Rate) mp3 audio.

How can I uninstall the Media Capture extension from my Firefox?

To uninstall the extension go to Firefox -> Add-ons -> Media Capture, then press Uninstall button.

How can I uninstall Media Capture extension from my Opera?

To uninstall the extension go to Opera -> Extensions, then find Media Capture and press "Remove form Opera".