add log for apng decoder
add log for apng decoder
enhance: "Save Image" more robust. Not depends on cookie.
change: do not dump image file by default.    conf.tempImageLifeMilliseconds default 5000 -> default 0
add support: convert ajpg live stream to mp4 file
add support: view mp4 file
comment
add support: convert ajpg to webm on-fly when recording
do not check ffmpeg if conf.convertAjpgToFormat is not set
dummy