[SOLVED] Extract every 250th frame from video?

cord-factor · 31st August 2010, 16:42

Subj. How can I do that?
I have 1 hour video and I have to do "Time-lapse" clip from it. Video is HDV (progressive, 25fps).
Which software can extract every 250th frame?
Next, the frame-sequence will be converted to video by mencoder (like this)

Code:

mencoder "mf://*.jpg" -mf fps=25 -o output.avi -ovc lavc -lavcopts vcodec=mpeg4

Guest · 31st August 2010, 18:13

Avisynth:

SelectEvery(250,0)

kypec · 31st August 2010, 18:51

Is Avisynth working in Linux???

cord-factor · 31st August 2010, 19:04

No, linux only solution. And, I don't use wine.

However, ffmpeg seems to can do that:

Code:

ffmpeg -i 02.m2t -y -an -sameq -s 1920x1080 -f image2 -r 1/10 nome%03d.png

it creates some PNG's, but I am not sure, is it correct frames...

nm · 31st August 2010, 19:25

How about encoding directly with MEncoder? This avoids unnecessary colorspace conversion (YUV->RGB->YUV) and writing temporary image files on disk:

Code:

mencoder -nosound -ovc lavc -lavcopts vcodec=mpeg4:vqscale=3 -vf framestep=250 -fps 6250 -ofps 25 input.m2t -o output.avi

Note the relation of framestep, ofps and fps: 250*25=6250. If you meant to encode every 10th frame (10x speedup instead of 250x), it would be -vf framestep=10 -fps 250 -ofps 25.

cord-factor · 1st September 2010, 16:14

Quote:

Originally Posted by nm

How about encoding directly with MEncoder? This avoids unnecessary colorspace conversion (YUV->RGB->YUV) and writing temporary image files on disk:

Code:

mencoder -nosound -ovc lavc -lavcopts vcodec=mpeg4:vqscale=3 -vf framestep=250 -fps 6250 -ofps 25 input.m2t -o output.avi

Note the relation of framestep, ofps and fps: 250*25=6250. If you meant to encode every 10th frame (10x speedup instead of 250x), it would be -vf framestep=10 -fps 250 -ofps 25.

Thx, It works

31st August 2010, 16:42	#1 \| Link
cord-factor Registered User Join Date: Jan 2008 Location: Kharkov, UA Posts: 105	[SOLVED] Extract every 250th frame from video? Subj. How can I do that? I have 1 hour video and I have to do "Time-lapse" clip from it. Video is HDV (progressive, 25fps). Which software can extract every 250th frame? Next, the frame-sequence will be converted to video by mencoder (like this) Code: mencoder "mf://.jpg" -mf fps=25 -o output.avi -ovc lavc -lavcopts vcodec=mpeg4 __________________ Gentoo linux Last edited by cord-factor; 1st September 2010 at 16:15.*

31st August 2010, 19:04	#4 \| Link
cord-factor Registered User Join Date: Jan 2008 Location: Kharkov, UA Posts: 105	No, linux only solution. And, I don't use wine. However, ffmpeg seems to can do that: Code: ffmpeg -i 02.m2t -y -an -sameq -s 1920x1080 -f image2 -r 1/10 nome%03d.png it creates some PNG's, but I am not sure, is it correct frames... __________________ Gentoo linux

31st August 2010, 19:25	#5 \| Link
nm Registered User Join Date: Mar 2005 Location: Finland Posts: 2,641	How about encoding directly with MEncoder? This avoids unnecessary colorspace conversion (YUV->RGB->YUV) and writing temporary image files on disk: Code: mencoder -nosound -ovc lavc -lavcopts vcodec=mpeg4:vqscale=3 -vf framestep=250 -fps 6250 -ofps 25 input.m2t -o output.avi Note the relation of framestep, ofps and fps: 25025=6250. If you meant to encode every 10th frame (10x speedup instead of 250x), it would be -vf framestep=10 -fps 250 -ofps 25*.

31st August 2010, 18:13	#2 \| Link
Guest Guest Join Date: Jan 2002 Posts: 21,901	Avisynth: SelectEvery(250,0)

31st August 2010, 18:51	#3 \| Link
kypec User of free A/V tools Join Date: Jul 2006 Location: SK Posts: 826	Is Avisynth working in Linux???