[FFmpeg-devel] [PATCH] avfilter: add rawdump filter

[Eoff, Ullysses A]

> -----Original Message-----
> From: Paul B Mahol [mailto:onemda at gmail.com]
> Sent: Wednesday, July 10, 2019 3:25 AM
> To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Cc: Eoff, Ullysses A <ullysses.a.eoff at intel.com>
> Subject: Re: [FFmpeg-devel] [PATCH] avfilter: add rawdump filter
> 
> On 7/10/19, Fu, Linjie <linjie.fu at intel.com> wrote:
> >> -----Original Message-----
> >> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf
> >> Of Paul B Mahol
> >> Sent: Wednesday, July 10, 2019 15:55
> >> To: FFmpeg development discussions and patches <ffmpeg-
> >> devel at ffmpeg.org>
> >> Cc: Eoff, Ullysses A <ullysses.a.eoff at intel.com>
> >> Subject: Re: [FFmpeg-devel] [PATCH] avfilter: add rawdump filter
> >>
> >> On 7/10/19, U. Artie Eoff <ullysses.a.eoff at intel.com> wrote:
> >> > This filter enables raw frames to be dumped to a
> >> > file before they are sent through the auto-inserted
> >> > scaler filter and useful when you want unscaled
> >> > raw frames in an output file.
> >> >
> >>
> >> Why?
> >>
> >> -f rawvideo doesn't work for you?
> >
> > unscaled raw video could be dumped through this filter in resolution
> > changing cases.
> >
> 
> Maybe, I still fail how this filter is useful, when user can use split
> filter to dump video
> at any point in graph.
> 

If there are already other ways to achieve the same result without this
filter then that's great!  Essentially, I'm trying to achieve exactly what
Linjie stated so we can compare raw results across different decoder
solutions.  And the forced insertion of the auto scaler in ffmpeg makes
that difficult for multi-resolution cases.

Could you point me to an example of using split to achieve this?

U. Artie

> 
> > IMHO, it will be great if there are some options available to disable/enable
> > the auto scaling filter
> > in pipeline, thus the whole stream doesn't need to be scaled into the same
> > size of the first frame.
> > The difference in scale algorithms will make it hard to compare the output
> > with other decoder.
> >
> > - linjie
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