Thread: Parsing time values for video trimming
i'm capturing video hi8 tapes sony gv-d200 dv files. video analog, , sony deck records whole tape including blank sections. these blank sections show neutral, solid gray color in video. generally, videos in set have average of 7 seconds blank, 25 minutes of actual footage, , rest of video blank (up 95 minutes).
ffmpeg blackframe filter can output frames potentially blank. 2 values filter "% of frame black:threshold (or how dark is)":
a condensed version of output:code:$ ffmpeg -threads 8 -i input.dv -vf blackframe=100:84 -an -f null -
i'd values marked in bold red. these values can have ffmpeg automatically trim blank frames skipping first 6.773433 seconds , creating output duration of 1948.880267-6.773433=~1942 seconds. think awk tool use here these 2 values, that's far got. ideas?code:[blackframe @ 0x20ad8e0] frame:1 pblack:100 pos:120000 pts:33367 t:0.033367 [blackframe @ 0x20ad8e0] frame:2 pblack:100 pos:240000 pts:66733 t:0.066733 [blackframe @ 0x20ad8e0] frame:3 pblack:100 pos:360000 pts:100100 t:0.100100 [blackframe @ 0x20ad8e0] frame:201 pblack:100 pos:24120000 pts:6706700 t:6.706700 [blackframe @ 0x20ad8e0] frame:202 pblack:100 pos:24240000 pts:6740067 t:6.740067 [blackframe @ 0x20ad8e0] frame:203 pblack:100 pos:24360000 pts:6773433 t:6.773433 frame= 451 fps= 0 q=0.0 size= -0kb time=00:00:14.97 bitrate= -0.0kbits/s frame= 878 fps=874 q=0.0 size= -0kb time=00:00:29.22 bitrate= -0.0kbits/s frame= 1292 fps=858 q=0.0 size= -0kb time=00:00:43.03 bitrate= -0.0kbits/s frame=57319 fps=800 q=0.0 size= -0kb time=00:31:52.38 bitrate= -0.0kbits/s frame=57722 fps=800 q=0.0 size= -0kb time=00:32:05.83 bitrate= -0.0kbits/s frame=58130 fps=800 q=0.0 size= -0kb time=00:32:19.44 bitrate= -0.0kbits/s [blackframe @ 0x20ad8e0] frame:58408 pblack:100 pos:7008960000 pts:1948880267 t:1948.880267 [blackframe @ 0x20ad8e0] frame:58409 pblack:100 pos:7009080000 pts:1948913633 t:1948.913633 [blackframe @ 0x20ad8e0] frame:58410 pblack:100 pos:7009200000 pts:1948947000 t:1948.947000 [blackframe @ 0x20ad8e0] frame:58411 pblack:100 pos:7009320000 pts:1948980367 t:1948.980367 [blackframe @ 0x20ad8e0] frame:58412 pblack:100 pos:7009440000 pts:1949013733 t:1949.013733 [blackframe @ 0x20ad8e0] frame:58413 pblack:100 pos:7009560000 pts:1949047100 t:1949.047100 [blackframe @ 0x20ad8e0] frame:58414 pblack:100 pos:7009680000 pts:1949080467 t:1949.080467 [blackframe @ 0x20ad8e0] frame:58415 pblack:100 pos:7009800000 pts:1949113833 t:1949.113833 [blackframe @ 0x20ad8e0] frame:58416 pblack:100 pos:7009920000 pts:1949147200 t:1949.147200 [blackframe @ 0x20ad8e0] frame:58417 pblack:100 pos:7010040000 pts:1949180567 t:1949.180567 [blackframe @ 0x20ad8e0] frame:58573 pblack:100 pos:7028760000 pts:1954385767 t:1954.385767 [blackframe @ 0x20ad8e0] frame:58574 pblack:100 pos:7028880000 pts:1954419133 t:1954.419133 frame=58575 fps=801 q=0.0 size= -0kb time=00:32:34.29 bitrate= -0.0kbits/s [blackframe @ 0x20ad8e0] frame:58575 pblack:100 pos:7029000000 pts:1954452500 t:1954.452500 [blackframe @ 0x20ad8e0] frame:58576 pblack:100 pos:7029120000 pts:1954485867 t:1954.485867 [blackframe @ 0x20ad8e0] frame:58577 pblack:100 pos:7029240000 pts:1954519233 t:1954.519233 [blackframe @ 0x20ad8e0] frame:58578 pblack:100 pos:7029360000 pts:1954552600 t:1954.552600 [blackframe @ 0x20ad8e0] frame:58579 pblack:100 pos:7029480000 pts:1954585967 t:1954.585967 [blackframe @ 0x20ad8e0] frame:59121 pblack:100 pos:7094520000 pts:1972670700 t:1972.670700 [blackframe @ 0x20ad8e0] frame:59122 pblack:100 pos:7094640000 pts:1972704067 t:1972.704067 frame=59123 fps=803 q=0.0 size= -0kb time=00:32:52.57 bitrate= -0.0kbits/s [blackframe @ 0x20ad8e0] frame:59123 pblack:100 pos:7094760000 pts:1972737433 t:1972.737433 [blackframe @ 0x20ad8e0] frame:59124 pblack:100 pos:7094880000 pts:1972770800 t:1972.770800 [blackframe @ 0x20ad8e0] frame:59125 pblack:100 pos:7095000000 pts:1972804167 t:1972.804167 [blackframe @ 0x20ad8e0] frame:59126 pblack:100 pos:7095120000 pts:1972837533 t:1972.837533 [blackframe @ 0x20ad8e0] frame:59127 pblack:100 pos:7095240000 pts:1972870900 t:1972.870900 [blackframe @ 0x20ad8e0] frame:59128 pblack:100 pos:7095360000 pts:1972904267 t:1972.904267
also, second value important. can live without first if makes things more realistic achieve.
i find python useful kind of thing. want?posted fakeoutdoorsman
i'm capturing video hi8 tapes sony gv-d200 dv files. video analog, , sony deck records whole tape including blank sections. these blank sections show neutral, solid gray color in video. generally, videos in set have average of 7 seconds blank, 25 minutes of actual footage, , rest of video blank (up 95 minutes).
ffmpeg blackframe filter can output frames potentially blank. 2 values filter "% of frame black:threshold (or how dark is)":
a condensed version of output:code:$ ffmpeg -threads 8 -i input.dv -vf blackframe=100:84 -an -f null -
i'd values marked in bold red. these values can have ffmpeg automatically trim blank frames skipping first 6.773433 seconds , creating output duration of 1948.880267-6.773433=~1942 seconds. think awk tool use here these 2 values, that's far got. ideas?code:[blackframe @ 0x20ad8e0] frame:1 pblack:100 pos:120000 pts:33367 t:0.033367 [blackframe @ 0x20ad8e0] frame:2 pblack:100 pos:240000 pts:66733 t:0.066733 [blackframe @ 0x20ad8e0] frame:3 pblack:100 pos:360000 pts:100100 t:0.100100 [blackframe @ 0x20ad8e0] frame:201 pblack:100 pos:24120000 pts:6706700 t:6.706700 [blackframe @ 0x20ad8e0] frame:202 pblack:100 pos:24240000 pts:6740067 t:6.740067 [blackframe @ 0x20ad8e0] frame:203 pblack:100 pos:24360000 pts:6773433 t:6.773433 frame= 451 fps= 0 q=0.0 size= -0kb time=00:00:14.97 bitrate= -0.0kbits/s frame= 878 fps=874 q=0.0 size= -0kb time=00:00:29.22 bitrate= -0.0kbits/s frame= 1292 fps=858 q=0.0 size= -0kb time=00:00:43.03 bitrate= -0.0kbits/s frame=57319 fps=800 q=0.0 size= -0kb time=00:31:52.38 bitrate= -0.0kbits/s frame=57722 fps=800 q=0.0 size= -0kb time=00:32:05.83 bitrate= -0.0kbits/s frame=58130 fps=800 q=0.0 size= -0kb time=00:32:19.44 bitrate= -0.0kbits/s [blackframe @ 0x20ad8e0] frame:58408 pblack:100 pos:7008960000 pts:1948880267 t:1948.880267 [blackframe @ 0x20ad8e0] frame:58409 pblack:100 pos:7009080000 pts:1948913633 t:1948.913633 [blackframe @ 0x20ad8e0] frame:58410 pblack:100 pos:7009200000 pts:1948947000 t:1948.947000 [blackframe @ 0x20ad8e0] frame:58411 pblack:100 pos:7009320000 pts:1948980367 t:1948.980367 [blackframe @ 0x20ad8e0] frame:58412 pblack:100 pos:7009440000 pts:1949013733 t:1949.013733 [blackframe @ 0x20ad8e0] frame:58413 pblack:100 pos:7009560000 pts:1949047100 t:1949.047100 [blackframe @ 0x20ad8e0] frame:58414 pblack:100 pos:7009680000 pts:1949080467 t:1949.080467 [blackframe @ 0x20ad8e0] frame:58415 pblack:100 pos:7009800000 pts:1949113833 t:1949.113833 [blackframe @ 0x20ad8e0] frame:58416 pblack:100 pos:7009920000 pts:1949147200 t:1949.147200 [blackframe @ 0x20ad8e0] frame:58417 pblack:100 pos:7010040000 pts:1949180567 t:1949.180567 [blackframe @ 0x20ad8e0] frame:58573 pblack:100 pos:7028760000 pts:1954385767 t:1954.385767 [blackframe @ 0x20ad8e0] frame:58574 pblack:100 pos:7028880000 pts:1954419133 t:1954.419133 frame=58575 fps=801 q=0.0 size= -0kb time=00:32:34.29 bitrate= -0.0kbits/s [blackframe @ 0x20ad8e0] frame:58575 pblack:100 pos:7029000000 pts:1954452500 t:1954.452500 [blackframe @ 0x20ad8e0] frame:58576 pblack:100 pos:7029120000 pts:1954485867 t:1954.485867 [blackframe @ 0x20ad8e0] frame:58577 pblack:100 pos:7029240000 pts:1954519233 t:1954.519233 [blackframe @ 0x20ad8e0] frame:58578 pblack:100 pos:7029360000 pts:1954552600 t:1954.552600 [blackframe @ 0x20ad8e0] frame:58579 pblack:100 pos:7029480000 pts:1954585967 t:1954.585967 [blackframe @ 0x20ad8e0] frame:59121 pblack:100 pos:7094520000 pts:1972670700 t:1972.670700 [blackframe @ 0x20ad8e0] frame:59122 pblack:100 pos:7094640000 pts:1972704067 t:1972.704067 frame=59123 fps=803 q=0.0 size= -0kb time=00:32:52.57 bitrate= -0.0kbits/s [blackframe @ 0x20ad8e0] frame:59123 pblack:100 pos:7094760000 pts:1972737433 t:1972.737433 [blackframe @ 0x20ad8e0] frame:59124 pblack:100 pos:7094880000 pts:1972770800 t:1972.770800 [blackframe @ 0x20ad8e0] frame:59125 pblack:100 pos:7095000000 pts:1972804167 t:1972.804167 [blackframe @ 0x20ad8e0] frame:59126 pblack:100 pos:7095120000 pts:1972837533 t:1972.837533 [blackframe @ 0x20ad8e0] frame:59127 pblack:100 pos:7095240000 pts:1972870900 t:1972.870900 [blackframe @ 0x20ad8e0] frame:59128 pblack:100 pos:7095360000 pts:1972904267 t:1972.904267
also, second value important. can live without first if makes things more realistic achieve.
data (which put in mpeg.dat):
mpeg.py:code:$ python mpeg.py <mpeg.dat 6.773433 1948.880267 1942.106834
code:import sys import re frameseen = false line in sys.stdin: m = re.search("^frame=", line) if m: frameseen = true continue m = re.search(" t:([0-9.]+)$", line) if m: if not frameseen: t0 = float(m.group(1)) else: t1 = float(m.group(1)) print "%f %f %f" % (t0, t1, t1-t0) sys.exit(0)
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