[FFmpeg-devel] [PATCH] avutil/parseutils: only accept full us duration, do not accept mss duration

Hendrik Leppkes h.leppkes at gmail.com
Thu Mar 8 01:14:00 EET 2018

On Thu, Mar 8, 2018 at 12:05 AM, Aurelien Jacobs <aurel at gnuage.org> wrote:
> On Wed, Mar 07, 2018 at 11:45:03PM +0100, Marton Balint wrote:
>> On Wed, 7 Mar 2018, Aurelien Jacobs wrote:
>> > On Tue, Mar 06, 2018 at 01:02:48AM +0100, Marton Balint wrote:
>> > > Accepting 'u' suffix for a time specification is neither intuitive nor
>> > > consistent (now that we don't accept m).
>> >
>> > The 'm' SI prefix is still accepted in various time options, and the 'u'
>> > prefix is still accepted in those options even after your patch, so you
>> > can't really argue that this patch improve consistency.
>> > (eg. -black_min_duration 5ms is still accepted).
>> > So this will surprise nobody that I don't like this patch.
>> This really is a cursed topic, I am not sure I follow, after the patch:
>> 5ms is accepted
>> 5us is accepted
>> 5m is not accepted
>> 5u is not accepted
> That is only for AV_OPT_TYPE_DURATION.
> All other numeric options type still accept SI prefix without unit.
> This include various time options such as black_min_duration.
> So after the patch, for black_min_duration:
> 5m is accepted
> 5u is accepted

Because those use AV_OPT_TYPE_DOUBLE, a generic type without any
possiblity of a unit.
Ideally those should all be transitioned to AV_OPT_TYPE_DURATION if
they refer to a time for consistency, and not the actual time-type
bend to reflect some generic type. Why would we have the duration type
if its just a copy of the double type anyway?

- Hendrik

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