Free online AVR to OPUS converter

What the AVR format is

AVR is an Audio Visual Research digital-audio format associated with older recording and editing software. You may encounter it in archived recordings, exported samples, or files produced by legacy Audio Visual Research applications rather than by current consumer audio programs.

AVR is not a common interchange format, so many modern players and editors do not open it directly. Its exact audio properties depend on the file, including sample rate, bit depth, channel count, and whether the source is speech or music.

What the OPUS format is

OPUS is a lossy audio codec normally stored in an Ogg container and saved with the .opus extension. It is designed for both speech and general audio, with low latency and good quality at relatively low bitrates.

OPUS is useful for web playback, voice recordings, calls, messaging, and compact archives. Typical targets are 32–64 kbps for speech and 64–128 kbps for music, although the appropriate setting depends on the source and intended use.

How to actually convert AVR to OPUS

FFmpeg is the most practical desktop option when its build includes the AVR demuxer and the libopus encoder.

1. Install FFmpeg from a current desktop package or distribution repository.
2. Check that the input is readable and inspect its properties with ffprobe "input.avr".
3. Convert the file with:

ffmpeg -i "input.avr" -c:a libopus -b:a 96k -f ogg "output.opus"

The command decodes the AVR audio, encodes it as Opus at 96 kbps, and writes a standards-compatible Ogg Opus file. Use 48k or 64k for speech, or raise the bitrate for music that contains dense high-frequency material.

If FFmpeg reports an unsupported input format, first open the AVR file in the legacy application that created it and export it as WAV or AIFF. Then convert the intermediate file:

ffmpeg -i "intermediate.wav" -c:a libopus -b:a 96k -f ogg "output.opus"

For a browser-based conversion, upload the file to 101convert.com, select OPUS as the output format, start the conversion, and download the result without installing software.

Quality and compatibility considerations

OPUS encoding is lossy, so the conversion cannot preserve more detail than the selected bitrate allows. Keep the original AVR file if it is an archival source; do not repeatedly convert between lossy formats.

FFmpeg may resample AVR audio automatically because Opus supports standardized internal rates up to 48 kHz. This is normally harmless, but inspect the output with ffprobe "output.opus" if a particular application requires a fixed sample rate or channel layout.

Some older players recognize the Opus codec only when it is inside an Ogg container. The explicit -f ogg option ensures that the resulting .opus file uses the usual Ogg Opus packaging.