do not check ffmpeg if conf.convertAjpgToFormat is not set
do not check ffmpeg if conf.convertAjpgToFormat is not set

koichirok/sji-android-screen-capture,koichirok/sji-android-screen-capture,Suwmlee/sji-android-screen-capture,koichirok/sji-android-screen-capture,Suwmlee/sji-android-screen-capture,Suwmlee/sji-android-screen-capture,koichirok/sji-android-screen-capture,Suwmlee/sji-android-screen-capture,koichirok/sji-android-screen-capture,Suwmlee/sji-android-screen-capture,Suwmlee/sji-android-screen-capture