ffmpeg dropping frames?

Question

I'm running this command

C:\>ffmpeg -i file.flv -sameq file.mp4

It may take an hour, it says drop=27, and of course it's counting, increasing, that's after 4min. Now 35 drops after 19500 frames.

Does this mean output will be significantly worse quality than input?

Should I add a switch?

aking1012 · Answer 1 · 2011-05-05 23:47:01Z

up vote 0 down vote accepted

35 of 19500 is less than .18% ... I would say don't worry about it(the human eye can only perceive so many frames per second after all).

answered May 5 '11 at 23:47

aking1012
4,7911312

	hmm, 13sec in 2 hours . say 12sec in 2h. That could be visible. and could even effect the talking in the video. losing some perhaps? Is there a switch to stop it dropping frames? – barlop May 6 '11 at 0:56
	the frames should be relatively evenly dispersed. usually drops on occasion are okay. if you must then try adjusting your fps and it might fix some things for you... – aking1012 May 6 '11 at 1:19
	I said it -could- affect the talking. I know if it's evenly dispersed and it probably is, then it might not affect the talking and probably won't perhaps noticeably affect it. But it could. More fps might I suppose drop more and less fps might I suppose lose the name amount of talking but by dropping less frames. – barlop May 6 '11 at 8:29
	acodec copy so it doesn't re-encode will make sure you have an exact copy of the audio. man ffmpeg – aking1012 May 6 '11 at 13:31
	my ffmpeg install drops a similar number of frames for re-encoding video. check the recent videos at vimeo.com/user2243209/videos . The earlier ones I was still fiddling with the ffmpeg settings. any artifacts are due to compiz during capture not frame rate or dropped frames. – aking1012 May 6 '11 at 13:46

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