[FFmpeg-devel] Query regarding codec parsers

[Gautam Ramakrishnan]

On Sun, Mar 29, 2020 at 6:12 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>
> Am So., 29. März 2020 um 14:23 Uhr schrieb Gautam Ramakrishnan
> <gautamramk at gmail.com>:
>
> > I had gone through ticket #7445
>
> Better tickets are imo:
> https://trac.ffmpeg.org/ticket/4669
> https://trac.ffmpeg.org/ticket/4679
> sample in http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4679/
> https://trac.ffmpeg.org/ticket/4827
> https://trac.ffmpeg.org/ticket/5360
>
> Two of them look easy to fix, the difficulty could be to explain
> why your fix is correct (in the commit message).
>
Sure, i shall work on them then. I thought it would  be difficult to fix these.
> > and it mentions about JPEG2000 parser.
> > 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?
> Carl Eugen
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-- 
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Gautam |