SHN Format Guide

Available Conversions

About SHN Format

SHN (Shorten) is a lossless audio compression format created by Tony Robinson at Cambridge University in 1993. It was one of the earliest practical lossless audio codecs and became the de facto standard for distributing live concert recordings during the late 1990s and early 2000s. The format uses a relatively simple linear predictive coding algorithm to compress audio data without any loss of quality. Shorten was particularly embraced by the live music trading community, especially fans of bands like the Grateful Dead, Phish, and other jam bands that allowed or encouraged audience taping. While the format has been largely superseded by FLAC for new recordings, millions of SHN files remain in circulation within live music archives and trading networks.

History of SHN

Shorten was developed by Tony Robinson at the Cambridge University Engineering Department and published in 1993 as a research project in lossless audio compression. The algorithm was originally described in his paper on lossless coding for speech and audio signals. In the mid-to-late 1990s, the format was adopted by the online live music trading community, which needed a way to share concert recordings without quality loss. Before Shorten, traders exchanged cassette tapes or uncompressed WAV files, which were impractical for internet distribution given the bandwidth limitations of the era. Shorten provided approximately 2:1 compression while preserving bit-perfect quality, making it feasible to share full concert recordings over dial-up and early broadband connections. Sites like etree.org became central hubs for SHN-format concert recordings. By the mid-2000s, FLAC began replacing SHN as the preferred lossless format due to its better compression, seeking support, and native metadata capabilities. However, the legacy of SHN in live music preservation is significant, and many archive sites still host vast collections of SHN recordings.

Key Features and Uses

Shorten uses linear predictive coding (LPC) to compress PCM audio data, typically achieving compression ratios of approximately 2:1 for CD-quality audio. The algorithm works by predicting each sample based on previous samples and encoding only the prediction error, which requires fewer bits to represent. SHN files support standard CD-quality audio (44.1 kHz, 16-bit stereo) and can also handle other sample rates and bit depths. The format does not include native metadata support, so users typically rely on accompanying text files or filenames for track information. SHN files also lack efficient seeking capabilities, meaning that jumping to a specific position within a file requires decoding from the beginning. Despite these limitations, the format's simplicity makes it fast to encode and decode, and its proven reliability has earned trust among archivists who value data integrity above all else.

Common Applications

SHN's primary application has been the preservation and distribution of live concert recordings. The format became synonymous with the live music trading community, where bands like the Grateful Dead, Phish, Widespread Panic, Dave Matthews Band, and many others allowed audience taping. Sites like etree.org, archive.org's Live Music Archive, and various band-specific trading communities hosted thousands of concerts in SHN format. Many of these recordings remain available only in SHN format, representing an important cultural archive of live music from the 1990s and 2000s. SHN files are supported by media players including foobar2000, VLC, Winamp (with plugin), and specialized tools like shntool and EAC (Exact Audio Copy). The format is commonly paired with MD5 checksum files to verify data integrity after transfer. Today, most new live music recordings are distributed in FLAC format, but SHN remains relevant for accessing historical recordings. Many users convert their SHN collections to FLAC for better metadata support and compatibility with modern devices while preserving bit-perfect audio quality.

Advantages and Disadvantages