MeGUI/Tools/Bitrate Calculator
From MeWiki
The MeGUI bitrate calculator is an extremely versatile calculator. It can give video bitrates for all the video types that MeGUI produces and can take in to account differing containers, audio input container, b-frames and so on.
The calculator is divided into four logical sections: Video, Audio, Output, and Result. It's easiest to go through the calculator in that order too.
The bitrate calculator only updates when you click a button or press enter, so that it doesn't get confused by half-entered values. Because of this, if you manually insert a value, you will need to press enter or click a button (such as increasing something by one and then decreasing it) for the calculation to refresh.
Contents |
[edit] Video
The video section allows you to choose the video properties, such as time and framerate.
- Hours / Minutes / Seconds: You can use these boxes to input the length of your video. If you have an AviSynth script open in the video section of the main window the time for it will already be imported, as will be the framerate.
- Total Length in Seconds: You can also use this box to input the length of your movie.
- Framerate:The framerate of your video.
- Number of frames: If your video is variable frame rate or you will be using a non-standard framerate, you can simply enter the number of frames here instead. The bitrate calculator bases the rest of the calculations on the value in this box.
- B-frames: If your video will contain b-frames you should check this box. B-frames add a very small amount of overhead - usually it has a difference of under 1kbit/second, but it will still produce a more accurate result.
[edit] Audio
The audio section allows you to specify up to two audio streams to be accounted for in the muxing process. Both tracks work the same.
- Bitrate: If you have not yet encoded the audio you can specify the expected/nominal bitrate here as well as the format you will be using with the Type dropdown menu.
- Select: If you have already encoded your audio you can select it with this button to use the exact size of the file and get a more accurate result. This method will automatically select the correct type for you.
[edit] Output
This section deals with the output type, which is made up of video format, container and filesize.
- Codec: You can select the codec you are using here. It has no effect on calculations, but is present for mux path finding.
- Container: The container used will have a large effect on the final bitrate, different containers mixed with different audio and video formats will require different amounts of overhead. The containers present here are determined by mux path finding.
[edit] Results
The final results section will let you specify either filesize or bitrate, and have the other value calculated for you. You can switch between these two modes of operation by clicking the radio buttons.
- Output size controls: There are three methods of choosing the output size.
- Filesize (kbytes): You can specify the filesize in kilobytes.
- Filesize (mbytes): You can specify the filesize in megabytes.
- Storage Preset: Many common sizes are stored in this list. You can quickly load the correct size from this list.
- Average Bitrate: To choose the average bitrate, simple enter it into the box.
If your result is an average bitrate, you can apply it to the curren video config by clicking Apply.
Note: The calculator is still bugy. It is being worked on slowly, but use at your own risk.
