AVI vs MP4 — Legacy Format vs Modern Standard

AVI (Audio Video Interleave) was Microsoft's answer to video storage in 1992. MP4 was standardised by MPEG in 2001. Technically, MP4 wins in nearly every category — but millions of AVI files exist in personal archives.

Features:

• AVI: Single video track, one audio track. No chapters, no subtitles, no streaming support.
• MP4: Multiple tracks, chapters, streaming metadata, and wide codec support.

Compression efficiency: AVI with DivX/Xvid was the 2000s standard. H.264 MP4 achieves the same visual quality at 40–60% smaller file sizes.

Compatibility: AVI with DivX/Xvid plays on most devices with VLC. Native Windows Media Player support requires codec packs. Many streaming devices and smart TVs have limited AVI support.

Quality: The container does not affect quality. DivX/Xvid AVI files have lower quality potential than H.264 MP4 because the codec is older. Re-encoding AVI to MP4 with H.264 does not recover the quality lost during DivX encoding.

Should you convert your AVI files to MP4?

• Yes, if you need to play them on devices with limited AVI support (Apple TV, iPhone, smart TV)
• Yes, if you want to reduce storage space (DivX/Xvid → H.264 saves 30–50%)
• Not necessary, if you only play them with VLC on a computer

Converting: HandBrake converts AVI to H.264 MP4 with presets optimised for Apple TV, web, or storage.