Acorn Replay

Overview
Acorn Replay is an audio/video container (file type AE7, ARMovie) that was the native multimedia format on RISC OS systems.

Software

 * FFmpeg (limited support)

Sample files

 * The Datafile PD CD 4 → REPLAY/FALCONS
 * http://riscos.com/ftp_space/370/files/diversions.zip → Applause, Blues, Drum+Cym, G2, Minor, Piano, Sax3, Space, Trumpet
 * http://riscos.com/ftp_space/370/files/sound.zip → 1812, Enigma
 * http://samples.ffmpeg.org/game-formats/rpl/
 * http://samples.ffmpeg.org/archive/container/rpl/
 * https://telparia.com/fileFormatSamples/video/acornReplayVideo/
 * https://timil.com/riscos/replay/
 * https://downloads.orpheusweb.co.uk/pub/RISCOS/StuttgartFTP/riscos/graphics/replay/

Resources

 * Playing 16 bit music, samples etc - an early description of the container format
 * Re: Replay codec sources - A description of the Moving Blocks video codec used in many Replay files
 * Multimedia Formats - contains an updated version of the above document with a more comprehensive list of codecs
 * Python module and examples - really simple proof of concept code for extracting key frames and audio from certain types of Replay movies