Convert XviD to ALAC — Free Online Converter

XviD, the open-source MPEG-4 Part 2 codec born from reverse-engineering DivX, became the backbone of internet video distribution during the CD-R era. Scene groups encoded DVD-quality video into 700 MB AVI files using XviD, pairing the video with MP3 audio at 128-192 kbps. These files circulated across peer-to-peer networks and became the de facto standard for sharing movies online before H.264 and modern streaming took over.

ALAC (Apple Lossless Audio Codec) provides bit-perfect audio compression at roughly half the size of uncompressed PCM, with native playback on every Apple device. Converting XviD to ALAC extracts the audio track, decodes it from MP3 or AC3, and encodes it losslessly for integration with iTunes, Apple Music, iPhone, iPad, and HomePod.

ALAC is the optimal format for preserving XviD audio within Apple's ecosystem. It plays natively on every Apple device without third-party apps, syncs efficiently through iTunes and iCloud, and maintains bit-perfect quality from the decoded source audio. Unlike AAC (which introduces another generation of lossy compression) or AIFF (which is uncompressed and enormous), ALAC provides the ideal balance of quality and practicality.

For anyone migrating a large XviD collection to Apple devices, ALAC extraction creates master audio files from which you can later transcode to any lossy format without the quality penalty of double compression. The lossless preservation means your extracted audio library never degrades, regardless of how many times you re-encode it for different devices.

FFmpeg demuxes the XviD AVI container to extract the audio stream — typically MP3 at 128-192 kbps in scene releases, or AC3 in DVD rips. The audio is decoded to raw PCM samples, then encoded using Apple's ALAC codec with its adaptive linear prediction and entropy coding algorithms. Output is wrapped in an M4A container with iTunes-compatible metadata atoms. ALAC achieves approximately 50% compression compared to the raw PCM, with zero quality loss.