[FFmpeg-user] Concat demux PTS discontinuity

[chanof]

Hi everyone, i try to create the encoding suitable for mpeg-dash for my
videos and concatenating them.
Unfortunately, the concat demux generates a discrepancy of the PTS between
videos concatenated:

PTS time stamp:
[...]
382.021016
384.021016
386.021016 the concat demux effect:
388.043047
390.043047
392.043047
[...]

Command line for encoding is
ffmpeg -y -i "$f" -i ../logo/logo.png -c:a aac -b:a 384k -ar 48000 -ac 2
-c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -r
$FPSC -b:v 4800k -maxrate 4800k -bufsize 3000k -profile:v main -crf 22 -t
$DUR -filter_complex
"[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1"
../buffer/${NAME}-1080.mp4

Command line for concat is
[code]ffmpeg -f concat -safe 0 -i 1080list.txt -t $TOTDUR -c copy
../output/1080set.mp4[/code]

Videos for input has regular timestamp and starts from 0s
How can I get a regular timestamp after concat demux process without
performing another encoding (to avoid a process that is too long)? 
Thanks!

Giammy



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