This is sample code for reference
HW support for decode+scaling in a single HW command (VDBOX+SFC).
The primary target usage is video analytics, but can be used playback,
transcoding, etc.
For VAAPI -
https://github.com/intel/libva
basically, it allows multiple outputs (in different resolutions) using the
decode context in a single call (you can search for “additional_outputs” in
va.h).
VAAPI sample code -
https://github.com/intel/libva-utils/commit/957a269f02b00760b7e807643c821ee26abc529b
---
fftools/ffmpeg_opt.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 53d688b764..c0dc376541 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -111,6 +111,10 @@ int filter_nbthreads = 0;
int filter_complex_nbthreads = 0;
int vstats_version = 2;
+int thumbnail_flags = 0;
+int thumbnail_width = 0;
+int thumbnail_height = 0;
+char *thumbnail_format;
static int intra_only = 0;
static int file_overwrite = 0;
@@ -1100,6 +1104,13 @@ static int open_input_file(OptionsContext *o, const char
*filename)
av_dict_set(&o->g->format_opts, "scan_all_pmts", "1",
AV_DICT_DONT_OVERWRITE);
scan_all_pmts_set = 1;
}
+
+ //thumbnail opt
+ av_dict_set_int(&o->g->codec_opts, "thumbnail_flags", thumbnail_flags,
AV_DICT_DONT_OVERWRITE);
+ av_dict_set_int(&o->g->codec_opts, "thumbnail_width", thumbnail_width,
AV_DICT_DONT_OVERWRITE);
+ av_dict_set_int(&o->g->codec_opts, "thumbnail_height", thumbnail_height,
AV_DICT_DONT_OVERWRITE);
+ av_dict_set(&o->g->codec_opts, "thumbnail_format", thumbnail_format,
AV_DICT_DONT_OVERWRITE);
+
/* open the input file with generic avformat function */
err = avformat_open_input(&ic, filename, file_iformat,
&o->g->format_opts);
if (err < 0) {
@@ -2898,6 +2909,13 @@ static int opt_vstats_file(void *optctx, const char
*opt, const char *arg)
return 0;
}
+static int opt_thumbnail_format(void *optctx, const char *opt, const char *arg)
+{
+ av_free (thumbnail_format);
+ thumbnail_format = av_strdup (arg);
+ return 0;
+}
+
static int opt_vstats(void *optctx, const char *opt, const char *arg)
{
char filename[40];
@@ -3746,5 +3764,15 @@ const OptionDef options[] = {
{ "filter_hw_device", HAS_ARG | OPT_EXPERT, { .func_arg =
opt_filter_hw_device },
"set hardware device used when filtering", "device" },
+ //thumbnail opt
+ { "thumbnail_flags", OPT_VIDEO | HAS_ARG | OPT_INT | OPT_INPUT, {
&thumbnail_flags },
+ "set thumbnail flags", "thumbnail" },
+ { "thumbnail_width", OPT_VIDEO | HAS_ARG | OPT_INT | OPT_INPUT, {
&thumbnail_width },
+ "set thumbnail width", "thumbnail" },
+ { "thumbnail_height", OPT_VIDEO | HAS_ARG | OPT_INT | OPT_INPUT, {
&thumbnail_height },
+ "set thumbnail height", "thumbnail" },
+ { "thumbnail_format", OPT_VIDEO | HAS_ARG | OPT_EXPERT , { .func_arg =
opt_thumbnail_format },
+ "set thumbnail format", "thumbnail" },
+
{ NULL, },
};
--
2.17.1
