Merge multiple video files using ffmpeg by adding multiple compress options

Question

I would like to merge multiple video files, performing in the same time complex compressing options.

How can I do that? The following ffmpeg command resulting this error:

 Filtergraph 'scale=1280:720,setpts=0.20*PTS' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph.
-vf/-af/-filter and -filter_complex cannot be used together for the same stream.

The ffmpeg command that i used:

ffmpeg -i GOPR0003.MP4 -i GOPR0004.MP4 -i GOPR0005.MP4 -i GOPR0005.MP4 -i GOPR0006.MP4 -i GOPR0007.MP4 -i GOPR0007.MP4 -i GOPR0008.MP4 -i GOPR0009.MP4 -i GOPR0010.MP4 -i GOPR0012.MP4 -i GOPR0013.MP4 -i GOPR0015.MP4 \
   -filter_complex "[0:v] [1:v] [2:v] [3:v] [4:v] [5:v] [6:v] [7:v] [8:v]  [9:v]  [10:v] concat=n=11:v=1 [v]" \
    -r 24 -crf 18  -vcodec libx264 -vb 20M -vf "scale=1280:720,setpts=0.20*PTS"  -an   -map "[v]"   video_output_01.avi

Answer 1

All filtering should be performed in the same filtergraph. Each -filter_complex or -vf defines a different filtergraph. You can use

-filter_complex "[0:v] [1:v] [2:v] [3:v] [4:v] [5:v] [6:v] [7:v] [8:v]  [9:v]  [10:v] concat=n=11:v=1,scale=1280:720,setpts=0.20*PTS [v]"

Answer 2

Finally, I used that command that resulted to compress multiple video files, while in the same time setting a range of compressing options in ffmpeg:

VIDEOFILES.txt contains a list of the videos that are to merged in a specific way:

ffmpeg -f concat -safe 0 -i VIDEOFILES.txt -r 32 -crf 14  -vcodec libx264 -vb 20M -vf "scale=1280:720,setpts=0.20*PTS" -fflags +genpts  -an   video_output.avi