[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 7:20 AM
> To: Eoff, Ullysses A <ullysses.a.eoff at intel.com>
> Cc: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH] avfilter: add rawdump filter
> 
> On 7/10/19, Eoff, Ullysses A <ullysses.a.eoff at intel.com> wrote:
> >> -----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.
> 
> Please provide examples of filtergraph where you are supposed to use
> this "filter".
> 

ffmpeg -v verbose -hwaccel vaapi -vaapi_device /dev/dri/renderD128 \
  -i input.h264 -vf 'format=nv12,rawdump=file=./ffdump.yuv' -f null -

> >
> > Could you point me to an example of using split to achieve this?
> 
> See documentation of split filter.

Thanks.  I will take a look and experiment with it.

> 
> >
> > 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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> >> >
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> >