[FFmpeg-user] fMP4 generation speed

[Carl Eugen Hoyos]

2018-06-22 21:53 GMT+02:00, Ronak <ronak2121-at-yahoo.com at ffmpeg.org>:
>
>
>> On Jun 20, 2018, at 4:48 PM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>>
>> 2018-06-20 18:37 GMT+02:00, Ronak <ronak2121-at-yahoo.com at ffmpeg.org>:
>>
>>> 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.
>>
>> Yes.
>>
>>> I'm wondering if the extra file I/O is the culprit here?
>>
>> Yes.
>>
>> You can now specify "-loglevel verbose" to get some useful
>> I/O info at the end of the console output.

> [AVIOContext @ 0x23b9140] Statistics: 0 seeks, 15 writeouts
> [AVIOContext @ 0x2310e80] Statistics: 0 seeks, 2107 writeouts
> [AVIOContext @ 0x22c72c0] Statistics: 541488832 bytes read, 2 seeks

This indicates that nothing absurd with regard to seeking happens.

Try with different drives for input and output to make sure we know
the culprit.

Carl Eugen