fix #502, transcoder support snapshot.

@@ -386,6 +386,7 @@ Remark:
 
 ### History
 
+* v3.0, 2015-10-20, fix [#502][bug #502], support snapshot with http-callback or transcoder. 3.0.5
 * v3.0, 2015-09-19, support amf0 and json to convert with each other.
 * v3.0, 2015-09-19, json objects support dumps to string.
 * v3.0, 2015-09-14, fix [#459][bug #459], support dvr raw api. 3.0.4
@@ -1277,6 +1278,7 @@ Winlin
 [bug #299]: https://github.com/simple-rtmp-server/srs/issues/299
 [bug #466]: https://github.com/simple-rtmp-server/srs/issues/466
 [bug #468]: https://github.com/simple-rtmp-server/srs/issues/468
+[bug #502]: https://github.com/simple-rtmp-server/srs/issues/502
 [bug #xxxxxxx]: https://github.com/simple-rtmp-server/srs/issues/xxxxxxx
 
 [r2.0a2]: https://github.com/simple-rtmp-server/srs/releases/tag/2.0a2

@@ -1281,6 +1281,7 @@ vhost example.transcode.srs.com {
             # video encoder name, "ffmpeg -vcodec"
             # can be:
             #       libx264: use h.264(libx264) video encoder.
+            #       png: use png to snapshot thumbnail.
             #       copy: donot encoder the video stream, copy it.
             #       vn: disable video output.
             vcodec          libx264;
@@ -1354,6 +1355,7 @@ vhost example.transcode.srs.com {
             # output format, "ffmpeg -f" can be:
             #       off, do not specifies the format, ffmpeg will guess it.
             #       flv, for flv or RTMP stream.
+            #       image2, for vcodec png to snapshot thumbnail.
             #       other format, for example, mp4/aac whatever.
             # default: flv
             oformat         flv;

@@ -262,7 +262,7 @@ int SrsEncoder::initialize_ffmpeg(SrsFFMPEG* ffmpeg, SrsRequest* req, SrsConfDir
     input = "rtmp://";
     input += SRS_CONSTS_LOCALHOST;
     input += ":";
-    input += req->port;
+    input += srs_int2str(req->port);
     input += "/";
     input += req->app;
     input += "?vhost=";

@@ -47,16 +47,17 @@ using namespace std;
 
 #ifdef SRS_AUTO_FFMPEG_STUB
 
-#define SRS_RTMP_ENCODER_COPY           "copy"
-#define SRS_RTMP_ENCODER_NO_VIDEO       "vn"
-#define SRS_RTMP_ENCODER_NO_AUDIO       "an"
+#define SRS_RTMP_ENCODER_COPY "copy"
+#define SRS_RTMP_ENCODER_NO_VIDEO "vn"
+#define SRS_RTMP_ENCODER_NO_AUDIO "an"
 // only support libx264 encoder.
-#define SRS_RTMP_ENCODER_VCODEC         "libx264"
+#define SRS_RTMP_ENCODER_VCODEC_LIBX264 "libx264"
+#define SRS_RTMP_ENCODER_VCODEC_PNG "png"
 // any aac encoder is ok which contains the aac,
 // for example, libaacplus, aac, fdkaac
-#define SRS_RTMP_ENCODER_ACODEC         "aac"
-#define SRS_RTMP_ENCODER_LIBAACPLUS     "libaacplus"
-#define SRS_RTMP_ENCODER_LIBFDKAAC      "libfdk_aac"
+#define SRS_RTMP_ENCODER_ACODEC "aac"
+#define SRS_RTMP_ENCODER_LIBAACPLUS "libaacplus"
+#define SRS_RTMP_ENCODER_LIBFDKAAC "libfdk_aac"
 
 SrsFFMPEG::SrsFFMPEG(std::string ffmpeg_bin)
 {
@@ -139,11 +140,11 @@ int SrsFFMPEG::initialize_transcode(SrsConfDirective* engine)
         return ret;
     }
     
-    if (vcodec != SRS_RTMP_ENCODER_COPY && vcodec != SRS_RTMP_ENCODER_NO_VIDEO) {
-        if (vcodec != SRS_RTMP_ENCODER_VCODEC) {
+    if (vcodec != SRS_RTMP_ENCODER_COPY && vcodec != SRS_RTMP_ENCODER_NO_VIDEO && vcodec != SRS_RTMP_ENCODER_VCODEC_PNG) {
+        if (vcodec != SRS_RTMP_ENCODER_VCODEC_LIBX264) {
             ret = ERROR_ENCODER_VCODEC;
             srs_error("invalid vcodec, must be %s, actual %s, ret=%d",
-                SRS_RTMP_ENCODER_VCODEC, vcodec.c_str(), ret);
+                SRS_RTMP_ENCODER_VCODEC_LIBX264, vcodec.c_str(), ret);
             return ret;
         }
         if (vbitrate < 0) {
@@ -319,11 +320,15 @@ int SrsFFMPEG::start()
             params.push_back(srs_int2str(vthreads));
         }
         
-        params.push_back("-profile:v");
-        params.push_back(vprofile);
+        if (!vprofile.empty()) {
+            params.push_back("-profile:v");
+            params.push_back(vprofile);
+        }
         
-        params.push_back("-preset");
-        params.push_back(vpreset);
+        if (!vpreset.empty()) {
+            params.push_back("-preset");
+            params.push_back(vpreset);
+        }
         
         // vparams
         if (!vparams.empty()) {

@@ -76,15 +76,16 @@ int SrsProcess::initialize(string binary, vector<string> argv)
     
     for (int i = 0; i < (int)argv.size(); i++) {
         std::string ffp = argv[i];
+        std::string nffp = (i < (int)argv.size() -1)? argv[i + 1] : "";
         
         // remove the stdout and stderr.
-        if (ffp == "1") {
+        if (ffp == "1" && nffp == ">") {
             if (i + 2 < (int)argv.size()) {
                 stdout_file = argv[i + 2];
                 i += 2;
             }
             continue;
-        } else if (ffp == "2") {
+        } else if (ffp == "2" && nffp == ">") {
             if (i + 2 < (int)argv.size()) {
                 stderr_file = argv[i + 2];
                 i += 2;

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
-#define VERSION_REVISION    4
+#define VERSION_REVISION    5
 
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"