[FFmpeg-user] Concatenation of mpg files

[Dzung Nguyen]

I concat video files using cat command:

cat *.mpg >output.mpg

And the final video is not playable. How should be the encoding of *.mpg
be? This is how I create them:

ffmpeg -f image2 -loop 1 -i input.png -q:v 0 out1.mpg