On 8/7/2018 3:25 PM, Carl Eugen Hoyos wrote:
> Hi!
>
> Attached patch allows monochrome encoding with libx264, supported in
> master since a few hours.
>
> Please comment, Carl Eugen
>
>
> 0001-lavc-libx264-Support-monochrome-encoding.patch
>
>
> From a26245de63bdc9afc6b21ea6e97b95a2a7e1e765 Mon Sep 17 00:00:00 2001
> From: Carl Eugen Hoyos <ceffm...@gmail.com>
> Date: Tue, 7 Aug 2018 20:23:06 +0200
> Subject: [PATCH] lavc/libx264: Support monochrome encoding.
>
> ---
> libavcodec/libx264.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
> index 12379ff..cc9e5c8 100644
> --- a/libavcodec/libx264.c
> +++ b/libavcodec/libx264.c
> @@ -443,6 +443,10 @@ static int convert_pix_fmt(enum AVPixelFormat pix_fmt)
> #ifdef X264_CSP_NV21
> case AV_PIX_FMT_NV21: return X264_CSP_NV21;
> #endif
> +#ifdef X264_CSP_I400
> + case AV_PIX_FMT_GRAY8:
> + case AV_PIX_FMT_GRAY10: return X264_CSP_I400;
> +#endif
> };
> return 0;
> }
> @@ -855,6 +859,9 @@ static const enum AVPixelFormat pix_fmts_8bit[] = {
> #ifdef X264_CSP_NV21
> AV_PIX_FMT_NV21,
> #endif
> +#ifdef X264_CSP_I400
> + AV_PIX_FMT_GRAY8,
> +#endif
Unneeded. This array is only used with old x264 builds.
> AV_PIX_FMT_NONE
> };
> static const enum AVPixelFormat pix_fmts_9bit[] = {
> @@ -867,6 +874,9 @@ static const enum AVPixelFormat pix_fmts_10bit[] = {
> AV_PIX_FMT_YUV422P10,
> AV_PIX_FMT_YUV444P10,
> AV_PIX_FMT_NV20,
> +#ifdef X264_CSP_I400
> + AV_PIX_FMT_GRAY10,
> +#endif
> AV_PIX_FMT_NONE
> };
Same.
> static const enum AVPixelFormat pix_fmts_all[] = {
> @@ -885,6 +895,10 @@ static const enum AVPixelFormat pix_fmts_all[] = {
> AV_PIX_FMT_YUV422P10,
> AV_PIX_FMT_YUV444P10,
> AV_PIX_FMT_NV20,
> +#ifdef X264_CSP_I400
> + AV_PIX_FMT_GRAY8,
> + AV_PIX_FMT_GRAY10,
> +#endif
> AV_PIX_FMT_NONE
> };
> #if CONFIG_LIBX264RGB_ENCODER
> -- 1.7.10.4
I think you need to add these two pixfmts to avfmt2_num_planes() as
well, so they may return 1 instead of the default 3.
It seems to work, so should be ok otherwise.
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