AVI broken or missing Index

[cbc1973]

Broken/missing index... This happens for me with every AVI file. I try to play and AVI with VLC on my iMac- "Broken or missing AVI index". I wait for it to build the index, then it will play but I cannot forward or control the video. When I try to search why this is happening all I get is a bunch of ads for video converters, no solution or reason for all the AVI files being broken.