[FFmpeg-devel] [PATCH]Warn if cbr and threads > 1 is used for jpeg encoding

Carl Eugen Hoyos cehoyos at ag.or.at
Wed Dec 18 00:37:38 CET 2013

Michael Niedermayer <michaelni <at> gmx.at> writes:

> > +            av_log(avctx, AV_LOG_WARNING, "JPEG CBR encoding 
> > works badly with more than one thread, "
> > +                   "consider using -threads 1 or a constant 
> > quantiser\n");
> it should work with slice threads, 

Yes, it does.

> just frame threads maybe dont work

It fails badly;-(

> also disabling frame threads in case no explicit 
> threads is specified might be nice

How would that work?
The default for thread_type is frame + slice, 
so how can libavcodec detect if it was explicitely 
specified or not?

Carl Eugen

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