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Old 28th September 2019, 21:17   #1  |  Link
kromak
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Join Date: Sep 2019
Posts: 1
ffmpeg takes too long to start reencoding

Hello. I am trying to reencode a certain video file while also splitting it in two, cutting off the first one hour and fourty minutes. Here is the command I use:

Quote:
ffmpeg -y -i input.mp4 -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -ss 1:40:00 -t 800000 -pass 1 -an -f avi /dev/null && ffmpeg -i input.mp4 -c:a libmp3lame -b:a 48k -ac 1 -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -ss 1:40:00 -t 80000 -pass 2 /media/C10B-34F3/output.avi
however ffmpeg is stuck on this in the last half hour or so:

Quote:
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=0.0 size= 6kB time=00:00:00.00 bitrate=N/A speed= 0x
So my questions are:

1) It will ever be stuck there or at some moment it will start to reencode for real ?
2) If 1) is true, is there anything I can do to speed-up the process?

Thanks for the help.
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Old 5th October 2019, 23:14   #2  |  Link
sneaker_ger
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Join Date: Dec 2002
Posts: 5,505
Try to put the -ss before the -i parameter to enable input seeking. If seeking is what takes long then that should speed things up.

https://trac.ffmpeg.org/wiki/Seeking
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