[FFmpeg-user] 371MB Output file for 6:50 min?
s.helbig at mailbox.org
Sun Jun 27 18:03:43 EEST 2021
Yes, the output now varies as I played with the '-segment_time' and left
out the '-timelimit' option.
I did not specify a codec, but there is only video, no audio so I left
it out for now. May refine this later.
First I'd like to get a loop recording working, returning a set amount
of output (segment files if possible) so I can estimate the size for
e.g. a 24hr loop to adjust storage accordingly.
> Several issues
> -timelimit uses CPU time in seconds, so whenever ffmpeg has used 1800
> seconds CPU time on your system. This is not related to the actual
> duration of the video, but how much time ffmpeg needs to execute on your
> CPU, which is on a modern system a fraction of a second for every second
> of video.
> Use -t 1800 if you want you recording to stop after an actual duration
> of 1800 seconds.
> You dit not specify a codec for your output, could be that ffmpeg is
> just writing raw (uncrompressed) video in there, which will grow to huge
> size very fast.
> On 26-06-2021 20:16, S. Helbig via ffmpeg-user wrote:
>> FFMPEG is creating an ever growing output file from a recorded IP cam
>> But the acual video is only about 7min.
>> My input command was:
>> ffmpeg -loglevel debug -timelimit 1.800 -hide_banner -i
>> 'http://192.168.1.234:567/videostream.cgi?user=USER&pwd=PWD' -y
>> -segment_time 1.800 /path/to/destination/stream.mp4
>> There are a few issues with this:
>> FFMPEG doesn't exit after 1800sec/30min. '-timelimit 1.800' seems to be
>> ignored (I also tried '1800', same result.)
>> The video time in the output file does not correspond to 1800sec/30min
>> despite its size (371 MB this time). This may be due to the
>> segmentation, so when stopped manually, it may not have completed a
>> But why is the output file growing then? '-segment_time' should limit
>> the size of this file = segment.
>> 1800 seconds of .mp4 should correspond to a fixed maximum size...or not?
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