[SOLVED] Blank render past frame 250 - set for 360

My disappointment isn’t the point of this post but I’m going to vent in a minute. Real trouble is Output to H.264 with mp3 encoding for audio was all great until frame 251 of a 360 frame animation. Other than the “Dimensions” section for Frame Range, where the heck else is this controlled?

I’m already at the edge of my understanding but FOR FUN! This is the first time I’m using an audio file to drive Shape Keys to move a mouth and the Animation Screen Layout and the …

Solved already this minute in the middle of typing the question. The Video Editing Layout. In my haste to do new things I didn’t know that the Sequencer had to be told when the Scene changed size or number of Frames - 250 when I first loaded it as a strip, to 361 to match the audio. Why??? isn’t it dynamic enough to f… Nevermind.

So is it the case that changes to Scene length require X delete strip and Add Strip Scene > Scene? That’s what I had to do.