[FFmpeg-user] fMP4 generation speed

Ronak ronak2121 at yahoo.com
Wed Jun 20 19:37:41 EEST 2018

Hey Carl,

That command took the following time:

real	3m19.316s
user	3m14.730s
sys	0m1.830s

I'm curious about your thoughts on this. With -codec copy, the decoder should not be involved, so it shouldn't be a bottleneck.
I'm wondering if the extra file I/O is the culprit here? Either in writing more logs or not buffering enough content in RAM to write out to disk in larger bursts.


> On Jun 20, 2018, at 12:12 PM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 2018-06-20 16:51 GMT+02:00, Ronak <ronak2121-at-yahoo.com at ffmpeg.org>:
>> Ffmpeg -I "${FILE}.mp4" -codec copy -f dash -single_file_name
>> "${FILE}_1sec.m4s" -min_seg_duration 975238.095238095 -hls_playlist 1
>> "${FILE}_1sec.mpd"
>> Here's an abbreviated dump of the logs for a 52:15:29.84 hour audio file.
>> You can find the full log here:
>> https://drive.google.com/open?id=13GyppqvUJRYQNG9XhJ0feDATjvL1FvFf
>> <https://drive.google.com/open?id=13GyppqvUJRYQNG9XhJ0feDATjvL1FvFf>
>> To note, this file took over 1 day to fragment, which is totally not
>> acceptable for our SLAs.
> Understandably.
> Please also test the following:
> $ ffmpeg -i bk_argo_001199_44_64.mp4 -f null -
> Carl Eugen
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