cutler

Write declarative recipes to render/cut/stitch/transform video and audio: yet another builder for ffmpeg filters, tailored to a specific usecase.

cutler is declarative

• define recipes in nickel
• each recipe defines one or more jobs that are rendered with ffmpeg
• jobs are composed of filter chains
• the first filter in each chain may have any number of inputs. All other filters must have 1 input.

cutler is powerful

• custom filter generators like concat_xfade that run ffprobe on their inputs, calculate transition offsets correctly and construct the proper ffmpeg filter chain
• instruct the recipe to run arbitrary scripts that generate input videos

cutler is lazy

• only runs commands if the final output depends on them being run

cutler is eagerly parallel

• all command runs are handled asynchronously
• all processes like ffmpegs, ffprobes, input generators are queued in the same pool: cutler doesn't stand around waiting

cutler likes data

• pass data from CSV or json to cutler recipes
• emit an ffmpeg job for every CSV line, or do a single stitched render that reads its inputs from CSV in one pass