Concat two mp4 video files

concat.bash

# 
# How to use
# ./concat main_video.mp4 prefix_video.mp4 output.mp4
#
#

rm -rf $3

SILENT="-loglevel panic"
SILENT=""

# get video size
eval $(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width $1)
size=${streams_stream_0_width}:${streams_stream_0_height}

# get video fps
eval $(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=r_frame_rate $1)
fps=${streams_stream_0_r_frame_rate}
#fps=$(($fps))

# adjust prefix fps and resolution to original video fps and size
ffmpeg  $SILENT -r $fps -i $2  -vf scale=$size -acodec copy tmp-$2
#ffmpeg -f lavfi -i aevalsrc=0 -r $fps -i $2 -vf scale=$size -shortest -c:a aac -strict experimental -flags global_header tmp-$2

# convert original video to ts
ffmpeg $SILENT -i $1 -map 0 -c copy -bsf h264_mp4toannexb -f mpegts $1.ts

# convert prefix to ts
ffmpeg $SILENT -i tmp-$2 -map 0 -c copy -bsf h264_mp4toannexb -f mpegts $2.ts

#concat
ffmpeg $SILENT -i "concat:$2.ts|$1.ts" -c copy -bsf:a aac_adtstoasc $3
#ffmpeg $SILENT  -i "concat:$2.ts|$1.ts" -c:v copy -c:a copy -map 0:0 -bsf:a aac_adtstoasc  $3

rm -rf $1.ts
rm -rf $2.ts
rm -rf tmp-$2