How to Convert a VBR to a CBR
Variable bit rate (VBR) audio encoding allows for variation in the amount of output data in a file. This results in a higher bit rate and more memory being allocated to more complex segments of the file, with a lower bit rate and less memory being used for less complex segments. VBR files are of slightly better quality than constant bit rate (CBR) files, which apply one inflexible bit rate to the entire file. However, many DVD players and DVD production programs have difficulties reading VBR files. As such, it may be necessary to convert your video's audio to CBR.
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Things You'll Need
- VirtualDub (any version)
- Windows 98 or newer
- Zip Utility Software (e.g., IZArc, WinZip)
Instructions
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Download VirtualDub from Sourceforge. Make sure that you download the 64-bit version only if you have a 64-bit operating system. Unzip the downloaded file and open "VirtualDub.exe."
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Under the "File" menu, select "Open video file..." and select the video for which you'd like to change the audio. Under the "Audio" menu, click on "Full processing mode."
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Open the "Audio" menu again, then select "Compression." Make sure that "<No compression (PCM)>" is highlighted, then click on the "OK" button.
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Under the "File" menu, select "Save WAV." Choose the name and location for your WAV file, then click "OK."
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Open the "Audio" menu and select "Audio from other file." Select the WAV file that you created, then click on the "OK" button.
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Return to the "Audio" menu and select "Compression..." again. Change the compression format to "MPEG Layer-3," then select your desired bit rate.
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To ensure that your video is untouched, open the "Video" menu and select "Direct stream copy." Open the "Audio" menu to check that "Full processing mode" is still selected. Open the "File" menu and save a copy of your video. When opened, this new file will automatically play with CBR audio.
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References
- Photo Credit dvd image by dinostock from Fotolia.com
