for #319, allow multiple ingest and transcode.

@@ -1119,6 +1119,7 @@ vhost ingest.srs.com {
     # ingest file/stream/device then push to SRS over RTMP.
     # the name/id used to identify the ingest, must be unique in global.
     # ingest id is used in reload or http api management.
+    # @remark vhost can contains multiple ingest
     ingest livestream {
         # whether enabled ingest features
         # default: off
@@ -1200,6 +1201,7 @@ vhost transcode.ingest.srs.com {
 # the main comments for transcode
 vhost example.transcode.srs.com {
     # the streaming transcode configs.
+    # @remark vhost can contains multiple transcode
     transcode {
         # whether the transcode enabled.
         # if off, donot transcode.
@@ -1214,13 +1216,14 @@ vhost example.transcode.srs.com {
             # whether the engine is enabled
             # default: off.
             enabled         on;
-            # input format, can be:
+            # input format, "ffmpeg -i", can be:
             # off, do not specifies the format, ffmpeg will guess it.
             # flv, for flv or RTMP stream.
             # other format, for example, mp4/aac whatever.
             # default: flv
             iformat         flv;
-            # ffmpeg filters, follows the main input.
+            # ffmpeg filters, between "-i" and "-vcodec"
+            # follows the main input.
             vfilter {
                 # the logo input file.
                 i               ./doc/ffmpeg-logo.png;
@@ -1228,38 +1231,41 @@ vhost example.transcode.srs.com {
                 # for filters, @see: http://ffmpeg.org/ffmpeg-filters.html
                 filter_complex  'overlay=10:10';
             }
-            # video encoder name. can be:
+            # video encoder name, "ffmpeg -vcodec"
+            # can be:
             #       libx264: use h.264(libx264) video encoder.
             #       copy: donot encoder the video stream, copy it.
             #       vn: disable video output.
             vcodec          libx264;
-            # video bitrate, in kbps
+            # video bitrate, in kbps, "ffmepg -b:v"
             # @remark 0 to use source video bitrate.
             # default: 0
             vbitrate        1500;
-            # video framerate.
+            # video framerate, "ffmepg -r"
             # @remark 0 to use source video fps.
             # default: 0
             vfps            25;
-            # video width, must be even numbers.
+            # video width, must be even numbers, "ffmepg -s"
             # @remark 0 to use source video width.
             # default: 0
             vwidth          768;
-            # video height, must be even numbers.
+            # video height, must be even numbers, "ffmepg -s"
             # @remark 0 to use source video height.
             # default: 0
             vheight         320;
-            # the max threads for ffmpeg to used.
+            # the max threads for ffmpeg to used, "ffmepg -thread"
             # default: 1
             vthreads        12;
-            # x264 profile, @see x264 -help, can be:
+            # x264 profile, "ffmepg -profile:v"
+            # @see x264 -help, can be:
             # high,main,baseline
             vprofile        main;
-            # x264 preset, @see x264 -help, can be: 
+            # x264 preset, "ffmpeg -preset"
+            # @see x264 -help, can be: 
             #       ultrafast,superfast,veryfast,faster,fast
             #       medium,slow,slower,veryslow,placebo
             vpreset         medium;
-            # other x264 or ffmpeg video params
+            # other x264 or ffmpeg video params, between "-preset" and "-acodec"
             vparams {
                 # ffmpeg options, @see: http://ffmpeg.org/ffmpeg.html
                 t               100;
@@ -1269,38 +1275,42 @@ vhost example.transcode.srs.com {
                 bf              3;
                 refs            10;
             }
-            # audio encoder name. can be:
+            # audio encoder name, "ffmpeg -acodec"
+            # can be:
             #       libfdk_aac: use aac(libfdk_aac) audio encoder.
             #       copy: donot encoder the audio stream, copy it.
             #       an: disable audio output.
             acodec          libfdk_aac;
-            # audio bitrate, in kbps. [16, 72] for libfdk_aac.
+            # audio bitrate, in kbps, "ffmpeg -b:a"
+            # [16, 72] for libfdk_aac.
             # @remark 0 to use source audio bitrate.
             # default: 0
             abitrate        70;
-            # audio sample rate. for flv/rtmp, it must be:
+            # audio sample rate, "ffmpeg -ar"
+            # for flv/rtmp, it must be:
             #       44100,22050,11025,5512
             # @remark 0 to use source audio sample rate.
             # default: 0
             asample_rate    44100;
-            # audio channel, 1 for mono, 2 for stereo.
+            # audio channel, "ffmpeg -ac"
+            # 1 for mono, 2 for stereo.
             # @remark 0 to use source audio channels.
             # default: 0
             achannels       2;
-            # other ffmpeg audio params
+            # other ffmpeg audio params, between "-ac" and "-f"/"-y"
             aparams {
                 # audio params, @see: http://ffmpeg.org/ffmpeg-codecs.html#Audio-Encoders
                 # @remark SRS supported aac profile for HLS is: aac_low, aac_he, aac_he_v2
                 profile:a   aac_low;
                 bsf:a       aac_adtstoasc;
             }
-            # output format, can be:
+            # output format, "ffmpeg -f" can be:
             #       off, do not specifies the format, ffmpeg will guess it.
             #       flv, for flv or RTMP stream.
             #       other format, for example, mp4/aac whatever.
             # default: flv
             oformat         flv;
-            # output stream. variables:
+            # output stream, "ffmpeg -y", variables:
             #       [vhost] the input stream vhost.
             #       [port] the intput stream port.
             #       [app] the input stream app.

@@ -189,7 +189,72 @@ vhost vhost.srs.com {
         ffmpeg ./objs/ffmpeg/bin/ffmpeg;
         engine {
             enabled off;
-            output rtmp://127.0.0.1:[port]/live?vhost=[vhost]/livestream;
+            iformat flv;
+            vfilter {
+                s 30;
+                ss 300;
+            }
+            vcodec libx264;
+            vbitrate 1500;
+            vfps 25;
+            vwidth 768;
+            vheight 320;
+            vthreads 12;
+            vprofile main;
+            vpreset medium;
+            vparams {
+                t 100;
+                coder 1;
+                b_strategy 2;
+                bf 3;
+                refs 10;
+            }
+            acodec libfdk_aac;
+            abitrate 70;
+            asample_rate 44100;
+            achannels 2;
+            aparams {
+                profile:a aac_low;
+            }
+            oformat flv;
+            output rtmp://127.0.0.1:[port]/[app]?vhost=[vhost]/[stream];
+        }
+    }
+    
+    transcode live {
+        enabled off;
+        ffmpeg ./objs/ffmpeg/bin/ffmpeg;
+        engine ffsuper {
+            enabled off;
+            iformat flv;
+            vfilter {
+                s 30;
+                ss 300;
+            }
+            vcodec libx264;
+            vbitrate 1500;
+            vfps 25;
+            vwidth 768;
+            vheight 320;
+            vthreads 12;
+            vprofile main;
+            vpreset medium;
+            vparams {
+                t 100;
+                coder 1;
+                b_strategy 2;
+                bf 3;
+                refs 10;
+            }
+            acodec libfdk_aac;
+            abitrate 70;
+            asample_rate 44100;
+            achannels 2;
+            aparams {
+                profile:a aac_low;
+            }
+            oformat flv;
+            output rtmp://127.0.0.1:[port]/[app]?vhost=[vhost]/[stream]_[engine];
         }
     }
     
@@ -200,8 +265,8 @@ vhost vhost.srs.com {
             enabled off;
             iformat flv;
             vfilter {
-                i ./doc/ffmpeg-logo.png;
-                filter_complex overlay=10:10;
+                s 30;
+                ss 300;
             }
             vcodec libx264;
             vbitrate 1500;

@@ -2096,14 +2096,26 @@ int SrsConfig::vhost_to_json(SrsConfDirective* vhost, SrsAmf0Object* obj)
     }
     
     // transcode
-    if ((dir = vhost->get("transcode")) != NULL) {
+    SrsAmf0StrictArray* transcodes = NULL;
+    for (int i = 0; i < (int)vhost->directives.size(); i++) {
+        dir = vhost->directives.at(i);
+        if (dir->name != "transcode") {
+            continue;
+        }
+        
+        if (!transcodes) {
+            transcodes = SrsAmf0Any::strict_array();
+            obj->set("transcodes", transcodes);
+        }
+        
         SrsAmf0Object* transcode = SrsAmf0Any::object();
-        obj->set("transcode", transcode);
+        transcodes->append(transcode);
         
+        transcode->set("apply", dir->dumps_arg0_to_str());
         transcode->set("enabled", SrsAmf0Any::boolean(get_transcode_enabled(dir)));
         
         SrsAmf0StrictArray* engines = SrsAmf0Any::strict_array();
-        obj->set("engines", engines);
+        transcode->set("engines", engines);
         
         for (int i = 0; i < (int)dir->directives.size(); i++) {
             SrsConfDirective* sdir = dir->directives.at(i);
@@ -2151,7 +2163,7 @@ int SrsConfig::dumps_engine(SrsConfDirective* dir, SrsAmf0Object* engine)
     
     SrsConfDirective* conf = NULL;
     
-    engine->set("name", dir->dumps_arg0_to_str());
+    engine->set("id", dir->dumps_arg0_to_str());
     engine->set("enabled", SrsAmf0Any::boolean(get_engine_enabled(dir)));
     
     if ((conf = dir->get("iformat")) != NULL) {