Convert MOD to FLV — Free Online Converter

MOD files are tracker music modules from the Commodore Amiga era (1987), containing embedded instrument samples and pattern-based sequencing data that together define a complete musical composition. The format's 4-channel architecture (extended to 8+ by later trackers) and 8-bit sample-based synthesis produced a distinctive sound that defined the demoscene, early PC gaming, and the chiptune movement. Each MOD file is a self-contained musical instrument rack plus score sheet, typically weighing just 100KB-1MB yet capable of producing minutes of complex, multi-layered music.

FLV (Flash Video) is Adobe's legacy streaming video container, once the dominant format for web video before HTML5 and the death of Flash Player in December 2020. Converting MOD to FLV produces an audio-only stream within a video container — there is no video track, only the rendered tracker audio packaged in FLV's tag-based structure. This conversion is relevant primarily for legacy Flash-based media servers, archived web content, or specific streaming infrastructure that still operates on FLV pipelines.

Despite Flash Player's official end-of-life, significant amounts of media infrastructure still operate on FLV-based pipelines. RTMP streaming servers (used by platforms like Twitch's ingest system, OBS Studio, and various IPTV solutions) use FLV as their native container format. If tracker music needs to be injected into an RTMP stream or served through legacy Flash media servers, FLV packaging is required.

Archival projects preserving early web multimedia culture sometimes need to recreate the original delivery format. Demoscene productions and retro game music that were once streamed as Flash content can be re-rendered from MOD sources into FLV to maintain format authenticity in digital preservation projects. The Wayback Machine and similar archives contain millions of FLV references that researchers may need to reconstruct.

FFmpeg first renders the MOD through its module decoder, synthesizing the tracker's pattern sequences and sample bank into stereo PCM audio. Since FLV is a video container, the output contains an audio stream with no video component. The audio is encoded as AAC or MP3 (the two codecs natively supported in FLV's specification) and muxed into FLV's tag-based binary format: a 9-byte FLV header declaring audio-only content, followed by a sequence of FLV tags each containing a timestamp, data size, and audio data packet. The FLV spec mandates specific audio format codes — 0x0A for AAC, 0x02 for MP3 — and the audio packets include codec-specific headers for proper decoder initialization.