@@ -2270,16 +2270,34 @@ static void print_sdp(void)

 {

     char sdp[16384];

     int i;

+    int j;

+    AVIOContext *sdp_pb;

     AVFormatContext **avc = av_malloc_array(nb_output_files, sizeof(*avc));

     if (!avc)

         exit_program(1);

-    for (i = 0; i < nb_output_files; i++)

-        avc[i] = output_files[i]->ctx;

+    for (i = 0, j = 0; i < nb_output_files; i++) {

+        if (!strcmp(output_files[i]->ctx->oformat->name, "rtp")) {

+            avc[j] = output_files[i]->ctx;

+            j++;

+        }

+    }

+

+    av_sdp_create(avc, j, sdp, sizeof(sdp));

+

+    if (!sdp_filename) {

+        printf("SDP:\n%s\n", sdp);

+        fflush(stdout);

+    } else {

+        if (avio_open2(&sdp_pb, sdp_filename, AVIO_FLAG_WRITE, &int_cb, NULL) < 0) {

+            av_log(NULL, AV_LOG_ERROR, "Failed to open sdp file '%s'\n", sdp_filename);

+        } else {

+            avio_printf(sdp_pb, "SDP:\n%s", sdp);

+            avio_close(sdp_pb);

+            av_free(sdp_filename);

+        }

+    }

-    av_sdp_create(avc, nb_output_files, sdp, sizeof(sdp));

-    printf("SDP:\n%s\n", sdp);

-    fflush(stdout);

     av_freep(&avc);

 }

@@ -3122,7 +3140,7 @@ static int transcode_init(void)

         return ret;

     }

-    if (want_sdp) {

+    if (sdp_filename || want_sdp) {

         print_sdp();

     }

@@ -470,6 +470,7 @@ extern FilterGraph **filtergraphs;

 extern int        nb_filtergraphs;

 extern char *vstats_filename;

+extern char *sdp_filename;

 extern float audio_drift_threshold;

 extern float dts_delta_threshold;

@@ -77,6 +77,7 @@ const HWAccel hwaccels[] = {

 };

 char *vstats_filename;

+char *sdp_filename;

 float audio_drift_threshold = 0.1;

 float dts_delta_threshold   = 10;

@@ -381,6 +382,13 @@ static int opt_map_channel(void *optctx, const char *opt, const char *arg)

     return 0;

 }

+static int opt_sdp_file(void *optctx, const char *opt, const char *arg)

+{

+    av_free(sdp_filename);

+    sdp_filename = av_strdup(arg);

+    return 0;

+}

+

 /**

  * Parse a metadata specifier passed as 'arg' parameter.

  * @param arg  metadata string to parse

@@ -3070,6 +3078,8 @@ const OptionDef options[] = {

         "set the initial demux-decode delay", "seconds" },

     { "override_ffserver", OPT_BOOL | OPT_EXPERT | OPT_OUTPUT, { &override_ffserver },

         "override the options from ffserver", "" },

+    { "sdp_file", HAS_ARG | OPT_EXPERT | OPT_OUTPUT, { opt_sdp_file },

+        "specify a file in which to print sdp information", "file" },

     { "bsf", HAS_ARG | OPT_STRING | OPT_SPEC | OPT_EXPERT | OPT_OUTPUT, { .off = OFFSET(bitstream_filters) },

         "A comma-separated list of bitstream filters", "bitstream_filters" },