video quality
if preferred video quality isn't available, next best is picked instead.
youtube codec and container
h264: best compatibility, average quality. max quality is 1080p.
av1: best quality and efficiency. supports 8k & HDR.
vp9: same quality as av1, but file is ~2x bigger. supports 4k & HDR.
av1 and vp9 aren't widely supported, you might have to use additional software to play/edit them. cobalt picks next best codec if preferred one isn't available.
youtube hls formats
beta
only h264 and vp9 codecs are available in this mode. original audio codec is aac, it's re-encoded for compatibility, audio quality may be slightly worse than the non-HLS counterpart.
this option is experimental, it may go away or change in the future.
high efficiency video codec
allows downloading videos from platforms like tiktok and xiaohongshu in higher quality at cost of compatibility.
twitter/x
GIF conversion is inefficient, converted file may be obnoxiously big and low quality.