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 also improving the documentation is certainly not a bad idea Thanks [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB What does censorship reveal? It reveals fear. -- Julian Assange
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
