[FFmpeg-devel] [PATCH] libavcodec/videotoolboxenc.c: add option to hevc encoder to prioritize speed.

[Simone Karin Lehmann]

Somehow it seems, that this patch never got onto the mailing list. So may I kindly ask you to review it. 

--
Stay hungry, stay foolish 

> Am 26.01.2022 um 17:31 schrieb Simone Karin Lehmann <simone at lisanet.de>:
> 
> 
> The patch adds an option to the hevc_videotoolbox encoder to prioritize speed for Macs with Apple Silicon CPU.
> 
> This speeds up encodings up to 50% - 70%. In conjunction with the qcale option -q, visible quality will be unchanged. The increase in file size is very moderate, although still depending on the source material.
> 
> 
> Signed-off-by: Simone Karin Lehmann <simone at lisanet.de>
> ---
> libavcodec/videotoolboxenc.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
> 
> diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
> index 418ff00b8d..ab0dad6cbc 100644
> --- a/libavcodec/videotoolboxenc.c
> +++ b/libavcodec/videotoolboxenc.c
> @@ -236,6 +236,7 @@ typedef struct VTEncContext {
>     int allow_sw;
>     int require_sw;
>     double alpha_quality;
> +    int64_t prio_speed;
> 
>     bool flushing;
>     int has_b_frames;
> @@ -1145,6 +1146,17 @@ static int vtenc_create_encoder(AVCodecContext   *avctx,
>         return AVERROR_EXTERNAL;
>     }
> 
> +    // prioritize speed over quality
> +    if (vtctx->prio_speed) {
> +        status = VTSessionSetProperty(vtctx->session,
> +                                      kVTCompressionPropertyKey_PrioritizeEncodingSpeedOverQuality,
> +                                      kCFBooleanTrue);
> +        if (status) {
> +            av_log(avctx, AV_LOG_ERROR, "Error setting PrioritizeEncodingSpeedOverQuality property: %d\n", status);
> +            return AVERROR_EXTERNAL;
> +        }
> +    }
> +
>     if ((vtctx->codec_id == AV_CODEC_ID_H264 || vtctx->codec_id == AV_CODEC_ID_HEVC)
>             && max_rate > 0) {
>         bytes_per_second_value = max_rate >> 3;
> @@ -2744,6 +2756,7 @@ static const AVOption hevc_options[] = {
>     { "main10",   "Main10 Profile",   0, AV_OPT_TYPE_CONST, { .i64 = HEVC_PROF_MAIN10 }, INT_MIN, INT_MAX, VE, "profile" },
> 
>     { "alpha_quality", "Compression quality for the alpha channel", OFFSET(alpha_quality), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, 0.0, 1.0, VE },
> +    { "prio_speed", "prioritize encoding speed", OFFSET(prio_speed), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
> 
>     COMMON_OPTIONS
>     { NULL },
> -- 
> 2.32.0 (Apple Git-132)