Hi,
I am trying to use ffmpeg to apply multiple filters -single input, multiple
outputs- . In concrete, I am splitting the output in two, then applying an
overlaying patch to one of those streams, split again and select a time range.
The command I am using is:
ffmpeg \
-i ./dataset_test/videos/jz_10_huron_barstow.mkv \
-an \
-sn \
-loglevel error \
-filter_complex \
"[0:v]split=2[L_in][F_in];
[L_in]
crop=226:307:21:74,scale=200x200,setdar=200:200,split=2\
[L_in_0][L_in_1];\
color=#808080:226x307,setpts=PTS-STARTPTS[L_PATCH];\
[F_in][L_PATCH]
overlay=21:74:shortest=1,scale=200x200,setdar=200:200,split=2\
[F_in_0][F_in_1];\
[F_in_0]select='between(t\,32\,212)',select='not(mod(n\,20))',setpts=(PTS-STARTPTS)/20[F_0];\
[F_in_1]select='between(t\,213\,393)',select='not(mod(n\,20))',setpts=(PTS-STARTPTS)/20[F_1];\
[L_in_0]select='between(t\,32\,212)',select='not(mod(n\,20))',setpts=(PTS-STARTPTS)/20[L_0];\
[L_in_1]select='between(t\,213\,393)',select='not(mod(n\,20))',setpts=(PTS-STARTPTS)/20[L_1]\
"\
-map [F_0] -an -sn ./out/jz_10_huron_barstow/F/0_F.mp4\
-map [F_1] -an -sn ./out/jz_10_huron_barstow/F/1_F.mp4\
-map [L_0] -an -sn ./out/jz_10_huron_barstow/L/0_L.mp4\
-map [L_1] -an -sn ./out/jz_10_huron_barstow/L/1_L.mp4\
For some reason, 0_F.mp4 is empty and 1_F.mp4 is cropped. My intuition is that
it has something to do with applying splitting + overlaying + selecting. I
think at some point some filter before select is changing the PTS of the frames
in some way select is not properly discarding them, but I honestly don't know
how to solve it. Some insights:
1) L_0 and L_1 are fine (no overlay is used in those two)
2) If I supress L outputs everything works fine (no "split" is needed at the
beginning)
Could someone provide some light? I've beens stucked with this for two days and
I don't really know what else to try.
Many thanks,
Josep
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