On Thu, May 21, 2020 at 09:42:18PM +0200, Carl Eugen Hoyos wrote: > Am Mi., 20. Mai 2020 um 22:21 Uhr schrieb Michael Niedermayer > <mich...@niedermayer.cc>: > > > > On Wed, May 20, 2020 at 08:48:41PM +0530, Gautam Ramakrishnan wrote: > > > On Tue, Apr 21, 2020 at 3:41 AM Michael Niedermayer > > > <mich...@niedermayer.cc> wrote: > > > > > > > > On Mon, Apr 20, 2020 at 04:13:44PM +0530, Gautam Ramakrishnan wrote: > > > > > On Mon, Apr 20, 2020 at 3:38 PM Michael Niedermayer > > > > > <mich...@niedermayer.cc> wrote: > > > > > > > > > > > > On Mon, Apr 20, 2020 at 01:36:47AM +0530, gautamr...@gmail.com > > > > > > wrote: > > > > > > > From: Gautam Ramakrishnan <gautamr...@gmail.com> > > > > > > > > > > > > > > I have attempted to write a JPEG2000 Parser. Need > > > > > > > help on testing the code and some tips on how to > > > > > > > > > > > > to test the code i would sugest to generate a file > > > > > > or files with many jpeg2000 images and then try to > > > > > > decode it to -f framecrc > > > > > This helps me check whether the image is correct by comparing the CRC > > > > > value? > > > > > > if that work repeat while varying the packet size > > > > > > input to the parser, a parser must work with anything > > > > > > from 1 byte per input to sizes being larger than a > > > > > > single frame. > > > > > > > > > > > So a packet to a parser is basically a smaller unit to which the > > > > > parser is fed > > > > > data to? When I tried printing buffer size during parse, it shows > > > > > 4096. > > > > > > > > > Does that mean the packet size was 4096? > > > > > > > > yes, that likely comes from > > > > libavformat/img2dec.c: size[0] = 4096; > > > From my understanding of the documentation, the -packetsize option can > > > change the > > > value from 4096 to any particular I want right? However when I try > > > setting the > > > -packetsize option, the buf_size variable still shows up as 4096. > > > > img2dec hardcodes 4096, thats something you could change of course. > > packetsize currently is listed with AV_OPT_FLAG_ENCODING_PARAM so its a > > muxer > > option. Some demuxers seem to set packet_size though instead of using it as > > input from the user > > The header does not document packet_size with any detail > > > > Its probably best to add a new AVOption to img2dec to adjust the 4096 > > Can't the image2pipe demuxer option -frame_size be used instead?
yes, indeed, that should work thanks [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB I have never wished to cater to the crowd; for what I know they do not approve, and what they approve I do not know. -- Epicurus
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