mp4 - AVAssetWriter saved video can be played in QuickTime Player, but once you drag the time bar, the screen becomes black, but audio is still playing -


avassetwriter save aac audio , h264 video h264, output video can played in quicktime player, once drag time bar several times, screen becomes black, audio still playing.

i test other normal mp4 videos, whatever drag time bar, video displays perfectly.

the pixel buffer comes metal render view.

click downloading my sample project

video recording class:
videorecorder.swift
videowriter.swift

i don't know goes wrong, can me, many many thanks.


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