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screenshots: add option to disable JPEG 4:4:4 output 

That's what it's usually about.
This commit is contained in:
wm4 2015-04-29 21:01:08 +02:00
parent 38114b6a36
commit f07c9b16f9
3 changed files with 11 additions and 2 deletions
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4
DOCS/man/options.rst
View File

@ -2654,6 +2654,10 @@ Screenshot
``--screenshot-jpeg-quality=<0-100>`` ``--screenshot-jpeg-quality=<0-100>``
Set the JPEG quality level. Higher means better quality. The default is 90. Set the JPEG quality level. Higher means better quality. The default is 90.
``--screenshot-jpeg-source-chroma=<yes|no>``
Write JPEG files with the same chroma subsampling as the video
(default: yes). If disabled, the libjpeg default is used.
``--screenshot-png-compression=<0-9>`` ``--screenshot-png-compression=<0-9>``
Set the PNG compression level. Higher means better compression. This will Set the PNG compression level. Higher means better compression. This will
affect the file size of the written screenshot file and the time it takes affect the file size of the written screenshot file and the time it takes

8
video/image_writer.c
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@ -48,6 +48,7 @@ const struct image_writer_opts image_writer_opts_defaults = {
.jpeg_optimize = 100, .jpeg_optimize = 100,
.jpeg_smooth = 0, .jpeg_smooth = 0,
.jpeg_baseline = 1, .jpeg_baseline = 1,
.jpeg_source_chroma = 1,
.tag_csp = 1, .tag_csp = 1,
}; };
@ -59,6 +60,7 @@ const struct m_sub_options image_writer_conf = {
OPT_INTRANGE("jpeg-optimize", jpeg_optimize, 0, 0, 100), OPT_INTRANGE("jpeg-optimize", jpeg_optimize, 0, 0, 100),
OPT_INTRANGE("jpeg-smooth", jpeg_smooth, 0, 0, 100), OPT_INTRANGE("jpeg-smooth", jpeg_smooth, 0, 0, 100),
OPT_FLAG("jpeg-baseline", jpeg_baseline, 0), OPT_FLAG("jpeg-baseline", jpeg_baseline, 0),
OPT_FLAG("jpeg-source-chroma", jpeg_source_chroma, 0),
OPT_INTRANGE("png-compression", png_compression, 0, 0, 9), OPT_INTRANGE("png-compression", png_compression, 0, 0, 9),
OPT_INTRANGE("png-filter", png_filter, 0, 0, 5), OPT_INTRANGE("png-filter", png_filter, 0, 0, 5),
OPT_STRING("format", format, 0), OPT_STRING("format", format, 0),
@ -193,8 +195,10 @@ static bool write_jpeg(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp
cinfo.optimize_coding = ctx->opts->jpeg_optimize; cinfo.optimize_coding = ctx->opts->jpeg_optimize;
cinfo.smoothing_factor = ctx->opts->jpeg_smooth; cinfo.smoothing_factor = ctx->opts->jpeg_smooth;
cinfo.comp_info[0].h_samp_factor = 1 << ctx->original_format.chroma_xs; if (ctx->opts->jpeg_source_chroma) {
cinfo.comp_info[0].v_samp_factor = 1 << ctx->original_format.chroma_ys; cinfo.comp_info[0].h_samp_factor = 1 << ctx->original_format.chroma_xs;
cinfo.comp_info[0].v_samp_factor = 1 << ctx->original_format.chroma_ys;
}
jpeg_start_compress(&cinfo, TRUE); jpeg_start_compress(&cinfo, TRUE);

1
video/image_writer.h
View File

@ -28,6 +28,7 @@ struct image_writer_opts {
int jpeg_dpi; int jpeg_dpi;
int jpeg_progressive; int jpeg_progressive;
int jpeg_baseline; int jpeg_baseline;
int jpeg_source_chroma;
int tag_csp; int tag_csp;
}; };