Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Miscellaneous Techniques › Is there a decent phone app for Music Video playback? › Not really an app but create
Not really an app but create a black video to the length of the song with the song as the audio. Create a large timeline indicator in it and load it to your smart phone. Pause it at the time you want and start playing it in front of the camera instead of using a clapper board. It will get you close enough.