Good morning
I have one question, if somebody could help, that will be nice.
In starting point of timeline editor in Blender I’ve got message: R_02 with little icon of stop.
What that’s mean? And how I can handle with that?
This is more inconvenient because I can’t end My render in that blend. Cycles work half way and stop.
I first time meet with this kind of situation.
So I humbly ask for some help.
Best regards
Show us waht you are talking about
Supply a demo .blend file for review
I’m guessing you’re meaning that you’re trying to render to a video file, and you get this error when starting the render. If that’s the case, try another codec/container preset, as not all the items listed there are necessarily usable (and not in particular combinations, for certain aspect ratios/resolutions, etc.). FFMPEG is dodgy like that 
Is ffmpeg built into Blender?
@Anthony: Yes - That’s what we use for all the video + audio input/output formats (apart from AVI JPEG, IIRC)