[FFmpeg-user] timebase mismatch error

[parth awasthi]

hey, ffmpeg code is showing me time base mismatch error from last 5 days. I
have not found any solution for this error on internet. My timebase got
stuck at 25 fps and no videos other than 25 fps is converting. Thank you in
advance.

This is my code -:
exec("$ffmpeg -i $target_file   -c:v libx264  -b:v 54k -pass 1   -r 15 -b:a
128k -f mp4 -y NUL && ^",$result);

exec("$ffmpeg -i $target_file   -c:v libx264  -b:v 54k -pass 2  -r 15 -b:a
128k  2>&1 $firstMp4", $result);

This is an error-:

[libx264 @ 000000ca0bd02480] timebase mismatch with 1st pass (1/15 vs 1/25)'