[FFmpeg-devel] libavcodec decoder output PIX_FMT

[SD]

Tomas,

Thank you for your reply.

I have one more question. App -> parser -> decoder -> VO -> framebuffer

Is the above possible ? Can we implement in above format ? How can we bypass
any in between decoder and VO if possible.

or App -> parser -> decoder -> libswscale -> VO -> framebuffer
if the only way we should implement ?

>>The answer to both of these questions is probably to always inspect
pix_fmt, width/height, coded_width/coded_height etc. and act
accordingly

Is not the above based on the decoder that we choose  ?

Thanks in advance,
SD.

On Mon, Oct 18, 2010 at 12:14 AM, Tomas H?rdin <tomas.hardin at codemill.se>wrote:

> On Sat, 2010-10-16 at 12:40 -0700, Srinivasa Deevi wrote:
> > Hi
> >
> > I would like to know if there are any restrictions on libavcodec decoder
> > output to be anything other than YUV type. Can that be RGB24/32 format as
> > well ?
>
> Yes. Almost all entries in the PixelFormat enum are ok (not sure about
> the hwaccel ones). You can check out AVCodec::pix_fmts if you like, but
> that's not always set. Also, the output pixel format will vary depending
> on the input, even if using the same codec. For instance, DV can be
> either 4:2:0, 4:1:1 or 4:2:2.
>
> > Also, if the decoder scales it down as well, how we inform the next level
> > like libvo . Is this possible with ffmpeg ?
>
> The decoder shouldn't do any scaling. At least I haven't come across it
> so far. It might request that the output should be cropped though, and
> the resolution may change, thus requiring scaling.
>
> The answer to both of these questions is probably to always inspect
> pix_fmt, width/height, coded_width/coded_height etc. and act
> accordingly.
>
> For specific codecs it might be possible to guarantee that for instance
> resolution doesn't change, but not in the general case.
>
> /Tomas
>
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