ffmpeg
ffmpeg -i 20191223_165517.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb 20191223_165517.h264
ffmpeg -i 20191223_173017.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb 20191223_173017.h264
ffmpeg -i 20191224_084432.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb 20191224_084432.h264
ffmpeg -i 20191224_090932.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb 20191224_090932.h264
ffmpeg -i 20191224_093932.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb 20191224_093932.h264
ffmpeg -i 20191223_173017.mp4 -vf scale=640:480,setdar=4:3 20191223_173017_640x480.mp4 -hide_banner
ffmpeg -i 20191223_173017.mp4 -vf scale=640:480 20191223_173017_640x480.mp4
ffmpeg -i 20191223_173017_640x480.mp4 -an -vcodec copy -bsf:v h264_mp4toannexb 20191223_173017_640x480.h264
ffmpeg -i 20191223_173017_640x480.mp4 -an -vcodec libx264 -bsf:v h264_mp4toannexb 20191223_173017_640x480.h264
#ffmpeg -vcodec copy -acodec copy -i 20180904_124644.mp4 -f flv 20180904_124644.flv
#ffmpeg -vcodec copy -acodec copy -i 20191223_165517.mp4 -f flv 20191223_165517.flv
#ffmpeg -vcodec copy -acodec copy -i 20191223_173017.mp4 -f flv 20191223_173017.flv
#ffmpeg -i <video file> -vcodec copy -i <audio file> -acodec copy test.flv
#ffmpeg -i <video file> -vcodec copy -i <audio file> -acodec copy test.flv
#ffmpeg -i <video file> -vcodec copy -i <audio file> -acodec copy test.flv
#ffmpeg -i 20180904_124644.h264 -vcodec copy 20180904_124644.flv
#ffmpeg -i 20191223_165517.h264 -vcodec copy 20191223_165517.flv
#ffmpeg -i 20191223_173017.h264 -vcodec copy 20191223_173017.flv