duplicate sout 到 display, 並使用硬體解碼

const char *const vlc_args[] = {
"-I=dummy",
"--vout=dummy",
"--network-caching=5000",
"--sout=#duplicate{dst=display{avcodec-hw=dxva2},dst=rtp{sdp=rtsp://:8554/ch1}}", "--sout-all", "--sout-keep",
"--verbose=2",
"--file-logging", logFile,
};
int vlc_argc = sizeof(vlc_args) / sizeof(vlc_args[0]);
vlcInstance = libvlc_new(vlc_argc, vlc_args);
const char *psz_mrl = "rtsp://169.254.1.168:554/live2.sdp";
media = libvlc_media_new_location(vlcInstance, psz_mrl);
mp = libvlc_media_player_new_from_media(media);

libvlc_media_release(media);
libvlc_media_player_play(mp);

---

vi ../modules/stream_out/display.c 

#define HW_TEXT N_("Hardware decoding")

#define HW_LONGTEXT N_("This allows hardware decoding when available.")

    add_string( SOUT_CFG_PREFIX "avcodec-hw", NULL, HW_TEXT,

              HW_LONGTEXT, true )

static const char *const ppsz_sout_options[] = {

    "audio", "video", "delay", "avcodec-hw", NULL

};

static int Open( vlc_object_t *p_this )

{

    config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,

                   p_stream->p_cfg );

    char *pAvcodecHw = var_GetString(p_stream, SOUT_CFG_PREFIX"avcodec-hw");

    if (pAvcodecHw) {

        var_Create(p_stream, "avcodec-hw", VLC_VAR_STRING);

        var_SetString(p_stream, "avcodec-hw", pAvcodecHw);

    }

}