Workflow to convert rendered images to video I have had recommendations to render images, rather than animation, so if an error occurs I do not need to rerender the entire sequence. I like the idea, but have had issues with high quality conversion of images into video. I have tried: ffmpeg, timelapseassembler, iMovie, Blender VSE. These can all do a decent job, but I find a lose quality in the images, relative to just rendering the straight workflow. 

So to reword the question: "What is your workflow from rendered images to high quality video?"
The only tool I've ever needed is ffmpeg. Here is my standard "recipe" for command-line conversion:

To convert default Blender sequenced PNGs at 24fps to a lossless 24fps YUV420p colorspace, x264 format video:

ffmpeg -r 24 -i %04d.png -c:v libx264 -r 24 -pix_fmt yuv420p -qp 0 output.mp4


The quality is determined by "-qp", with 0 best (lossless) quality, 51 worst. Also, know that the first "-r" determines how long each PNG will be shown, while the second "-r" determines the actual framerate of the output video. 

As an example using that same command above, but starting from 0100.png, with each image viewable for 5 seconds in a video with a framerate of 30fps, plus a forced-rescale to 1920x1080 thrown in too:

ffmpeg -r 1/5 -start_number 100 -i %04d.png -c:v libx264 -r 30 -s 1920x1080 -pix_fmt yuv420p -qp 0 output.mp4