> Perian is a free, open source QuickTime component that adds native
> support for many popular video formats.
>
> Perian enables QuickTime application support for additional media:
>
> File formats: AVI, DIVX, FLV, MKV, GVI, VP6, and VFW
>
> Video types: MS-MPEG4 v1 & v2, DivX, 3ivx, H.264, Sorenson H.263,
> FLV/Sorenson Spark, FSV1, VP6, H263i, VP3, HuffYUV, FFVHuff, MPEG1 &
> MPEG2 Video, Fraps, Snow, NuppelVideo, Techsmith Screen Capture,
> DosBox Capture
>
> Audio types: Windows Media Audio v1 & v2, Flash ADPCM, Xiph Vorbis
> (in Matroska), and MPEG Layer I & II Audio, True Audio, DTS Coherent
> Acoustics, Nellymoser ASAO
>
> AVI support for AAC, AC3 Audio, H.264, MPEG4, VBR MP3 and more
>
> Subtitle support for SSA/ASS, SRT, SAMI
>
> #2 Download Earlier release suitable for G3 Macs which are known to
> have issues with later versions.

<https://www.perian.org/>

Compatibility
Architecture: PPC x86 (Intel:Mac)

Mac OS X 10.4.7+