Hi. Thanks for hint, 2 quick questions:
1) I need to set some other flags to change from VBR to CBR (as seems to be in this case?)? 2) Any idea, how much it would be 80% in 1 - 100 scale? If we convert from 100 to 31, it should be ~6, is it right? Thanks! 2009/4/2 Edwin van der Horst <[email protected]> > Clive, Stas, > > Without looking at the source you provided, > you can specify the quality of outgoing JPEG 'stream' with qmin and > qmax params: > > encContext->qmin = 1; // best quality > encContext->qmax = 1; > > The lower, the better. > > Edwin > > On Thu, Apr 2, 2009 at 12:38 AM, Clive Taylor <[email protected]> wrote: > > Thanks, Stas. > > > > This is more than I hoped for. > > > > Clive > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Stas Oskin > > Sent: 01 April 2009 19:31 > > To: Libav* user questions and discussions > > Subject: Re: [libav-user] Writing single frames to JPEG > > > > Hi. > > > > This code worked pretty well for me: > > http://readlist.com/lists/mplayerhq.hu/ffmpeg-user/1/8128.html > > > > The only issue I had is that I'm unable to specify the outgoing quality. > > > > Can anyone comment on this? > > > > Regards. > > > > 2009/3/31 Clive Taylor <[email protected]> > > > >> Thank you, Edwin. I will give it a try. > >> > >> Clive > >> > >> -----Original Message----- > >> From: [email protected] > >> [mailto:[email protected]] On Behalf Of Edwin van der > >> Horst > >> Sent: 31 March 2009 09:01 > >> To: Libav* user questions and discussions > >> Subject: Re: [libav-user] Writing single frames to JPEG > >> > >> Clive, > >> > >> I still think using the MJPEG codec might work for you, as you can > >> encode just a single frame using the codec, > >> which essentially just works as an JPEG encoder, it only uses p-frames > >> (in other words, full JPEG files frames as output > >> decode the correct frame you wish to encode to jpeg, set the encoder > >> parameters, and call the encode function. > >> > >> Good luck, > >> > >> Edwin > >> > >> > >> On Tue, Mar 31, 2009 at 1:54 AM, Mark Heath <[email protected]> > >> wrote: > >> > > >> > On 31/03/2009, at 10:47 AM, Clive Taylor wrote: > >> >> > >> > > >> >> That's my new task. I'm already using libavformat, etc in my code > > to > >> >> read the frames, and I've adapted the frame accurate seek library > >> code, > >> >> too. The whole lot is running under Windows, but Linux and OS/X > >> versions > >> >> are needed. > >> >> > >> >> I thought the really hard part was solved until I tried to work out > >> how > >> >> to save a single frame as a JPEG. > >> > > >> > Maybe look at the jpeg library. > >> > > >> > http://www.ijg.org/ > >> > > >> > Mark > >> > _______________________________________________ > >> > libav-user mailing list > >> > [email protected] > >> > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > >> > > >> _______________________________________________ > >> libav-user mailing list > >> [email protected] > >> https://lists.mplayerhq.hu/mailman/listinfo/libav-user > >> > >> > >> _______________________________________________ > >> libav-user mailing list > >> [email protected] > >> https://lists.mplayerhq.hu/mailman/listinfo/libav-user > >> > > _______________________________________________ > > libav-user mailing list > > [email protected] > > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > > > > > > _______________________________________________ > > libav-user mailing list > > [email protected] > > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > > > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
