On Mon, Apr 13, 2020 at 11:00 PM Carl Eugen Hoyos <ceffm...@gmail.com> wrote: > > Am Mo., 13. Apr. 2020 um 17:27 Uhr schrieb Gautam Ramakrishnan > <gautamr...@gmail.com>: > > > > On Sun, Mar 29, 2020 at 8:34 PM Carl Eugen Hoyos <ceffm...@gmail.com> wrote: > > > > > > Am So., 29. März 2020 um 16:45 Uhr schrieb Gautam Ramakrishnan > > > <gautamr...@gmail.com>: > > > > > > > > > What exactly does a parser do and how is it different from a > > > > > > decoder? > > > > > > I am unable to understand the exact use case of a parser. > > > > > > > > > > Try the following: > > > > > $ cat 1.jpg 2.jpg | ffmpeg -i -f null - > > > > > (Is expected to decode two frames as can be seen in the console > > > > > output, > > > > > also works for example with png) > > > > > > > > > > $ cat 1.j2k 2.j2k | ffmpeg -i - -f null - > > > > > Will only decode one frame because there is no parser to split the > > > > > input. > > > > > > > > > So does it basically try to find the SOC marker and EOC markers and > > > > split the streams into frames? > > > > > > Basically, yes. > > > Look at existing parsers in libavcodec/*parser* (or git grep > > > AVCodecParser), > > > especially the jpeg parser. > > > Would working on a parser be a good idea now? > > Either that or you look at ticket #4681 (no idea how difficult this is). > > Carl Eugen > _______________________________________________ > 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".
Hi, I thought I'll start with the parser first. I went through the BMP and JPEG parsers and needed some more clarification. So, each frame could either be a JPEG2000 file or a JPEG2000 codestream. The parse function must be able to find the end of the file/codestream and return the location of it. Is my understanding correct? -- ------------- Gautam | _______________________________________________ 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".
