Free online STR to MP3 converter

PlayStation game videos often contain soundtracks that standard music players, phones, and audio editors cannot read from the original STR stream. Converting the audio to MP3 provides a smaller, widely compatible file for playback or editing.

What the STR format is

In the Video category, STR usually identifies a Sony PlayStation video-stream file extracted from a game disc, disc image, emulator data, or development tools. It is a console-specific stream rather than a general-purpose container such as MP4.

A PlayStation STR stream commonly contains MDEC-compressed video and compressed game audio, often PlayStation XA ADPCM. Some STR files contain video only, and some related files use variants that current media software cannot decode.

What the MP3 format is

MP3 is a lossy audio format supported by phones, media players, browsers, portable devices, and most audio editors. Its perceptual compression produces much smaller files than uncompressed audio, but it discards information during encoding.

MP3 cannot recover audio missing from the STR source. Re-encoding PlayStation ADPCM as MP3 adds another lossy-compression stage, so keep the original STR if preservation matters.

How to convert STR to MP3 with FFmpeg

FFmpeg is the most controllable desktop option when the installed build supports the PlayStation STR demuxer, MDEC video decoder, and XA audio decoder.

1. Install a current FFmpeg build with MP3 encoding support through libmp3lame.
2. Inspect the file and confirm that it contains an audio stream:

ffprobe -hide_banner input.str

Look for an audio stream in the output. If none is listed, the file is video-only, stores audio separately, or uses an unsupported STR variant.

3. Extract the first audio stream and encode it as a high-quality variable-bitrate MP3:

ffmpeg -i input.str -map 0:a:0 -vn -c:a libmp3lame -q:a 2 output.mp3

-map 0:a:0 selects the first audio stream, and -vn excludes the video. For a fixed bitrate, replace -q:a 2 with -b:a 192k. Use a different audio-stream index, such as 0:a:1, when the file contains multiple audio streams.

Using the 101convert converter

You can convert the file on 101convert.com for free without installing software. Upload the STR file, choose MP3 as the output format, start the conversion, and download the result. The conversion succeeds only when the particular STR variant is recognized and contains a decodable audio stream.

Quality and compatibility limits

PlayStation game audio may use a low sample rate, limited bandwidth, or ADPCM compression. Increasing the MP3 bitrate cannot restore detail removed by the original game encoding; it only limits additional MP3 loss.

If FFmpeg cannot identify the file, verify that it is the PlayStation video-stream format rather than another file type using the same .str extension. Specialized PlayStation STR extraction software may be required for unsupported variants or files whose video and audio are stored separately.

For editing or preservation, extract to WAV or FLAC when possible and create MP3 only for distribution or device compatibility. Neither format can restore audio that was never present in the STR stream.