Technology YouTube’s audio delay of an H.264 file is +0.1 seconds and here’s how to fix it It probably will depends on codecs and other video’s structures, but from my trial-and-error experiment the delay is +0.1 seconds (you hear audio way after the picture) for H.264 .mp4 file. (Exported from Premiere Pro with H.264 preset, then run through Handbrake)