[FFmpeg-devel] [PATCH 1/3][RFC] avutil/frame: add AV_FRAME_FLAG_DISPOSABLE

[Michael Niedermayer]

On Mon, Aug 26, 2019 at 01:17:25PM -0300, James Almer wrote:
> Used to signal frames that can be safely discarded without losing
> any picture data, side data, or metadata other than timing info.
> 
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
> This implements the "disposable frame" solution to allow library
> users to drop duplicate frames before further processing if desired,
> instead of forcing decoders to output vfr content when cfr is coded
> in the bitstream.
> 
>  doc/APIchanges      | 3 +++
>  libavutil/frame.h   | 5 +++++
>  libavutil/version.h | 2 +-
>  3 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/APIchanges b/doc/APIchanges
> index 682b67aa25..b28d702bae 100644
> --- a/doc/APIchanges
> +++ b/doc/APIchanges
> @@ -15,6 +15,9 @@ libavutil:     2017-10-21
>  
>  API changes, most recent first:
>  
> +2019-08-xx - xxxxxxxxxx - lavu 58.34.100 - avframe.h
> +  Add AV_FRAME_FLAG_DISPOSABLE
> +
>  2019-08-xx - xxxxxxxxxx - lavf 58.31.101 - avio.h
>    4K limit removed from avio_printf.
>  
> diff --git a/libavutil/frame.h b/libavutil/frame.h
> index 5d3231e7bb..e1bf8795d2 100644
> --- a/libavutil/frame.h
> +++ b/libavutil/frame.h
> @@ -522,6 +522,11 @@ typedef struct AVFrame {
>   * A flag to mark the frames which need to be decoded, but shouldn't be output.
>   */
>  #define AV_FRAME_FLAG_DISCARD   (1 << 2)
> +/**
> + * A flag to indicate frames that can be discarded by the encoder. I.e. frames
> + * that are an exact duplicate of the previous one.
> + */

... exact duplicate of the previous one, except its timestamp and duration.

maybe AV_FRAME_FLAG_DUPLICATE or AV_FRAME_FLAG_REPEATED would be clearer ?

thx

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Does the universe only have a finite lifespan? No, its going to go on
forever, its just that you wont like living in it. -- Hiranya Peiri
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