> From: ffmpeg-devel [mailto:ffmpeg-devel-boun...@ffmpeg.org] On Behalf
> Of Linjie Fu
> Sent: Tuesday, March 26, 2019 1:51 PM
> To: ffmpeg-devel@ffmpeg.org
> Cc: Fu, Linjie
> Subject: [FFmpeg-devel] [PATCH, v2] lavc/qsvenc: expose low_power option
> in H264 QSV
>
> Always exposes low_power option for h264 qsv, and reports a warning if
> VDENC is not supported with current version of MSDK.
>
> Signed-off-by: Linjie Fu
> ---
> [v2]: repalce "VDENC" with "low_power" to be more understandable.
>
> libavcodec/qsvenc.c | 11 ++-
> libavcodec/qsvenc_h264.c | 2 --
> 2 files changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c index
> 5aa020d47b..8264d0a413 100644
> --- a/libavcodec/qsvenc.c
> +++ b/libavcodec/qsvenc.c
> @@ -495,9 +495,18 @@ static int init_video_param(AVCodecContext *avctx,
> QSVEncContext *q)
> }
> }
>
> +if (q->low_power) {
> #if QSV_HAVE_VDENC
> -q->param.mfx.LowPower = q->low_power ?
> MFX_CODINGOPTION_ON : MFX_CODINGOPTION_OFF;
> +q->param.mfx.LowPower = MFX_CODINGOPTION_ON; #else
> +av_log(avctx, AV_LOG_WARNING, "The low_power option is "
> +"not supported with this MSDK
> version.\n");
> +q->low_power = 0;
> +q->param.mfx.LowPower = MFX_CODINGOPTION_OFF;
> #endif
> +} else
> +q->param.mfx.LowPower = MFX_CODINGOPTION_OFF;
> +
> q->param.mfx.CodecProfile = q->profile;
> q->param.mfx.TargetUsage= avctx->compression_level;
> q->param.mfx.GopPicSize = FFMAX(0, avctx->gop_size);
> diff --git a/libavcodec/qsvenc_h264.c b/libavcodec/qsvenc_h264.c index
> f458137848..93044a58c9 100644
> --- a/libavcodec/qsvenc_h264.c
> +++ b/libavcodec/qsvenc_h264.c
> @@ -154,9 +154,7 @@ static const AVOption options[] = {
> { "auto" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 =
> MFX_MF_AUTO }, INT_MIN, INT_MAX, VE, "mfmode" },
> #endif
>
> -#if QSV_HAVE_VDENC
> { "low_power", "enable low power mode(experimental: many
> limitations by mfx version, BRC modes, etc.)", OFFSET(qsv.low_power),
> AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE}, -#endif
>
> { "repeat_pps", "repeat pps for every frame", OFFSET(qsv.repeat_pps),
> AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
How about move this h264 private option to qsvenc.h to make it a common option
for all codecs?
Though it is not supported for all codecs, but IMHO this not a big problem
since we will check it at runtime:
https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/qsvenc.c#L389
It will be aligned with ffmpeg-vaapi, and avoid extra effort if other codecs
add low_power support.
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