H4M file

HVQM4 (file extension: .h4m or .hvqm4) is a video format developed by Hudson Soft used in nearly all GameCube games for pre-rendered video. Pikmin 1's attract demos and ending credits are found as .h4m files in dataDir\MovieData. After two decades of people struggling to make their own decoders, Hudson Soft's own SDK for working with this format was made available here in 2020 and it works with one exception: No tool is currently able to play audio from a Nintendo produced H4M file because they are modified to use STX audio instead of whatever the default for HVQM4 is. Here is the code the game uses to play its H4M cutscenes, which should help with making a custom tool for them.

Movie	Description
cntA_S.h4m	A Pause Screen Demo That Plays When There Is Long Periods Of Inactivity.
cntB_S.h4m	A Pause Screen Demo That Plays When There Is Long Periods Of Inactivity.
cntC_S.h4m	A Pause Screen Demo That Plays When There Is Long Periods Of Inactivity.
cntD_S.h4m	A Pause Screen Demo That Plays When There Is Long Periods Of Inactivity.
sr_S.h4m	The Ending Credits Of The Game With The Normal Non 100% Ending At The End.
srhp_S.h4m	The Ending Credits Of The Game With The "Best" Ending At The End.

Credits: Minty_Meeo, foobar