[FFmpeg-devel] [PATCH] libavcodec/mpeg12: Remove "fast" mode

[Kieran Kunhya]

On Mon, 30 Oct 2023 at 06:41, Matthias Dressel <lists.ffmpeg at deadcode.eu>
wrote:

> On 29.10.23 16:43, Kieran Kunhya wrote:
> > $subj as discussed at VDD
> >
> > Kieran
>
> IMHO the commit message should have contained some reason as to *why*
> this was removed.
> Now, someone looking at the log needs to find this patch on the ML, then
> follow the reference to find VDD meeting notes where they finally
> find... nothing. Because all the notes say is:
>
>  > We should remove it
>
> Unfortunately, I'm too late and it's pushed now, but maybe you can at
> least give a short explanation here on the ML?
>

"Fast" mode did some kind of out-of-spec VLC reading and dequant of MPEG-2
to allow faster decoding. This isn't really relevant in 2023 as MPEG-2
decoding is very fast in the official spec-compliant mode.

Kieran