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

[Paul B Mahol]

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".

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

See documentation of split filter.

>
> 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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>