CODEWITHSUNDEEP
videoffmpegcommandmp4frame-rate
des_r_clarke
des_r_clarke

Reputation: 33

How to avoid ffmpeg filter_complex overriding the fps of a file?

I'm fairly new to ffmpeg so apologies if this is a simple problem.

I'm trying to tile four 60 fps videos using the script below. It works, but the output is at 25 fps. When I try to use -r to force it back to 60, it looks like 25 fps upsampled to 60, counting duplicated frames when rendering.

How can I preserve the original files?

ffmpeg -i vln1.mp4 -i vln2.mp4 -i vla.mp4 -i cello.mp4 -filter_complex \
  "nullsrc=size=2800x2400 [base]; \
   [0:v] setpts=PTS-STARTPTS, scale=2800x600 [A]; \
   [1:v] setpts=PTS-STARTPTS, scale=2800x600 [B]; \
   [2:v] setpts=PTS-STARTPTS, scale=2800x600 [C]; \
   [3:v] setpts=PTS-STARTPTS, scale=2800x600 [D]; \
   [base] [A] overlay=shortest=0 [tmp1]; \
   [tmp1][B] overlay=shortest=0:y=600 [tmp2]; \
   [tmp2][C] overlay=shortest=0:y=1200 [tmp3]; \
   [tmp3][D] overlay=shortest=0:y=1800" \
  -c:v libx264 quartetscore.mp4

Upvotes: 3

Views: 3314

Answers (1)

llogan
llogan

Reputation: 134003

Set the frame rate for the nullsrc filter (default is 25 fps):

ffmpeg -i vln1.mp4 -i vln2.mp4 -i vla.mp4 -i cello.mp4 -filter_complex \
  "nullsrc=size=2800x2400:rate=60 [base]; \
   [0:v] setpts=PTS-STARTPTS, scale=2800x600 [A]; \
   [1:v] setpts=PTS-STARTPTS, scale=2800x600 [B]; \
   [2:v] setpts=PTS-STARTPTS, scale=2800x600 [C]; \
   [3:v] setpts=PTS-STARTPTS, scale=2800x600 [D]; \
   [base] [A] overlay=shortest=0 [tmp1]; \
   [tmp1][B] overlay=shortest=0:y=600 [tmp2]; \
   [tmp2][C] overlay=shortest=0:y=1200 [tmp3]; \
   [tmp3][D] overlay=shortest=0:y=1800" \ 
  -c:v libx264 quartetscore.mp4

Or if you want to stack just use the hstack filter instead of nullsrc and multiple overlay:

ffmpeg -i vln1.mp4 -i vln2.mp4 -i vla.mp4 -i cello.mp4 -filter_complex \ 
  "[0:v] setpts=PTS-STARTPTS, scale=2800x600 [A]; \
   [1:v] setpts=PTS-STARTPTS, scale=2800x600 [B]; \
   [2:v] setpts=PTS-STARTPTS, scale=2800x600 [C]; \
   [3:v] setpts=PTS-STARTPTS, scale=2800x600 [D]; \
   [A][B][C][D]hstack=inputs=4" \
  -c:v libx264 quartetscore.mp4

See Vertically or horizontally stack (mosaic) several videos using ffmpeg? for many more examples.

Upvotes: 1

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