ffmepg use record

First, change the volume of the video

Video recording of the phone, there may be too small volume, you can use ffmpeg command to increase the volume

Reference: https://blog.programster.org/change-audio-level-in-video

command:

Increase the volume: ffmpeg -i VID_20191003_164810_1.mp4 -vcodec copy -af "volume = 10dB" VID_20191003_164810_12.mp4

Volume Down: ffmpeg -i VID_20191003_164810_1.mp4 -vcodec copy -af "volume = -10dB" VID_20191003_164810_12.mp4