diff -ruN old/src/mbase/project/serialization.h new/src/mbase/project/serialization.h
--- old/src/mbase/project/serialization.h	2017-06-01 13:54:44.086895687 +0430
+++ new/src/mbase/project/serialization.h	2017-06-01 14:09:16.523275880 +0430
@@ -75,7 +75,9 @@
 template<typename T>
 std::string MakeString(const T& t)
 {
-    return (str::stream() << t).str();
+    str::stream ss;
+    ss << t;
+    return ss.str();
 }
 
 template<typename T>
diff -ruN old/src/mgui/dvdimport.cpp new/src/mgui/dvdimport.cpp
--- old/src/mgui/dvdimport.cpp	2017-06-01 13:54:44.086895687 +0430
+++ new/src/mgui/dvdimport.cpp	2017-06-01 14:06:42.488114237 +0430
@@ -211,10 +211,11 @@
                 row[VF().selState]  = false;
                 row[VF().name]      = VobFName(vob.pos);
                 row[VF().thumbnail] = vob.aspect == af4_3 ? pix4_3 : pix16_9;
-                std::string desc = (str::stream(Mpeg::SecToHMS(vob.tmLen, true)) <<  ", "
-                                    << vob.sz.x << "x" << vob.sz.y << ", "
-                                    << (vob.aspect == af4_3 ? "4:3" : "16:9") << ", " 
-                                    << std::fixed << std::setprecision(2) << vob.Count()/512. << " " << _("MB")).str();
+                str::stream ss (Mpeg::SecToHMS(vob.tmLen, true));
+                ss << ", " << vob.sz.x << "x" << vob.sz.y << ", "
+                  << (vob.aspect == af4_3 ? "4:3" : "16:9") << ", " 
+                  << std::fixed << std::setprecision(2) << vob.Count()/512. << " " << _("MB");
+                std::string desc = ss.str();
                 row[VF().desc]      = desc;
             }
             CompleteSelection(id, false);
diff -ruN old/src/mbase/project/media.cpp new/src/mbase/project/media.cpp
--- old/src/mbase/project/media.cpp	2017-06-01 14:25:09.492134844 +0430
+++ new/src/mbase/project/media.cpp	2017-06-01 14:37:53.196336367 +0430
@@ -58,7 +58,9 @@
 
 std::string MakeAutoName(const std::string& str, int old_sz)
 {
-    return (str::stream() << str << " " << old_sz+1).str();
+    str::stream ss;
+    ss << str << " " << old_sz+1;
+    return ss.str();
 }
 
 void VideoMD::AddChapter(ChapterItem chp)
diff -ruN old/src/mbase/project/menu.cpp new/src/mbase/project/menu.cpp
--- old/src/mbase/project/menu.cpp	2017-06-01 14:25:09.495468141 +0430
+++ new/src/mbase/project/menu.cpp	2017-06-01 14:39:42.004331141 +0430
@@ -166,7 +166,9 @@
 static std::string MakeObjectPath(int idx, const char* type)
 {
     ASSERT( idx != NO_HNDL );
-    return (str::stream() << type << "." << idx).str();
+    str::stream ss;
+    ss << type << "." << idx;
+    return ss.str();
 }
 
 std::string GetMediaRef(MediaItem mi)
@@ -197,7 +199,9 @@
 void RefMaker::Visit(VideoChapterMD& obj)
 {
     refStr  = GetMediaRef(obj.owner);
-    refStr += (str::stream() << "." << ChapterPosInt(&obj)).str();
+    str::stream ss;
+    ss << "." << ChapterPosInt(&obj);
+    refStr += ss.str();
 }
 
 std::string Media2Ref(MediaItem mi)
@@ -233,8 +237,9 @@
 
 std::string ThrowBadIndex(const char* prefix, int idx)
 {
-    throw std::runtime_error(
-        (str::stream() << prefix << idx).str() );
+    str::stream ss;
+    ss << prefix << idx;
+    throw std::runtime_error(ss.str());
 }
 
 MediaItem TryGetMedia(int idx)
diff -ruN old/src/mbase/project/srl-common.cpp new/src/mbase/project/srl-common.cpp
--- old/src/mbase/project/srl-common.cpp	2017-06-01 14:25:09.495468141 +0430
+++ new/src/mbase/project/srl-common.cpp	2017-06-01 14:40:56.524722225 +0430
@@ -36,10 +36,12 @@
 std::string ToString(const RGBA::Pixel& pxl)
 {
     using Mpeg::set_hms;
-    return (str::stream("#") << std::hex 
-            << set_hms() << (int)pxl.red 
-            << set_hms() << (int)pxl.green 
-            << set_hms() << (int)pxl.blue << (int)pxl.alpha).str();
+    str::stream ss ("#");
+    ss << std::hex 
+      << set_hms() << (int)pxl.red 
+      << set_hms() << (int)pxl.green 
+      << set_hms() << (int)pxl.blue << (int)pxl.alpha;
+    return ss.str();
 }
 
 // как pango_color_parse()
diff -ruN old/src/mgui/author/render.cpp new/src/mgui/author/render.cpp
--- old/src/mgui/author/render.cpp	2017-06-01 14:25:09.498801438 +0430
+++ new/src/mgui/author/render.cpp	2017-06-01 14:28:08.901379890 +0430
@@ -1307,7 +1307,9 @@
 
 bool RenderMainPicture(const std::string& out_dir, Menu mn, int i)
 {
-    Author::Info((str::stream() << "Rendering menu \"" << mn->mdName << "\" ...").str());
+    str::stream ss;
+    ss << "Rendering menu \"" << mn->mdName << "\" ...";
+    Author::Info(ss.str());
     const std::string mn_dir = MakeMenuPath(out_dir, mn, i);
 
     if( IsMotion(mn) )
diff -ruN old/src/mgui/author/script.cpp new/src/mgui/author/script.cpp
--- old/src/mgui/author/script.cpp	2017-06-01 14:25:09.498801438 +0430
+++ new/src/mgui/author/script.cpp	2017-06-01 14:31:23.248978018 +0430
@@ -130,7 +130,9 @@
     {
         VideoItem vi = IsVideo(mi);
         ASSERT( vi );
-        str = (str::stream() << "title " << GetAuthorNumber(vi)).str();
+        str::stream ss;
+        ss << "title " << GetAuthorNumber(vi);
+        str = ss.str();
     }
     return str;
 }
@@ -179,7 +181,9 @@
     // Потому: для удоства пользователей даем создавать нулевую главу, разрешая это здесь 
     // (однако доп. нулевые главы будут приводить к ошибке Cannot jump to chapter N ... only M exist)
     int c_num = ChapterPosInt(&obj) + (owner->List()[0]->chpTime ? 2 : 1) ;
-    res = (str::stream() << "jump title " << v_num << " chapter " << c_num << ";").str();
+    str::stream ss;
+    ss << "jump title " << v_num << " chapter " << c_num << ";";
+    res = ss.str();
 }
 
 static std::string MakeButtonJump(MediaItem mi, bool vts_domain)
@@ -204,7 +208,9 @@
     if( !fs::native(name) )
         name = "Menu";
 
-    std::string fname = (str::stream() << idx+1 << "." << name).str();
+    str::stream ss;
+    ss << idx+1 << "." << name;
+    std::string fname = ss.str();
     return cnv_from_utf8 ? ConvertPathFromUtf8(fname) : fname ;
 }
 
@@ -626,7 +632,9 @@
 void AuthorSectionInfo(const std::string& str)
 {
     Author::Info("\n#", false);
-    Author::Info((str::stream() << "# " << str).str(), false);
+    str::stream ss;
+    ss << "# " << str;
+    Author::Info(ss.str(), false);
     Author::Info("#\n", false);
 }
 
@@ -1082,7 +1090,9 @@
 
 static void AuthorImpl(const std::string& out_dir)
 {
-    AuthorSectionInfo((str::stream() << "Build DVD-Video in folder: " << out_dir).str());
+    str::stream ss;
+    ss << "Build DVD-Video in folder: " << out_dir;
+    AuthorSectionInfo(ss.str());
     IteratePendingEvents();
 
     IndexVideosForAuthoring();
diff -ruN old/src/mgui/project/add.cpp new/src/mgui/project/add.cpp
--- old/src/mgui/project/add.cpp	2017-06-01 14:25:09.498801438 +0430
+++ new/src/mgui/project/add.cpp	2017-06-01 14:33:26.303387642 +0430
@@ -86,7 +86,9 @@
 
 static std::string FpsToStr(const Point& frate)
 {
-    return (str::stream() << (double)frate.x/frate.y).str();
+    str::stream ss;
+    ss << (double)frate.x/frate.y;
+    return ss.str();
 }
 
 static std::string TVTypeStr(bool is_ntsc)
@@ -163,7 +165,9 @@
     // *
     bool is_aspect_ok = vid.sarCode == af4_3 || vid.sarCode == af16_9;
     Point aspect = vid.SizeAspect();
-    std::string aspect_str = (str::stream() << aspect.x << ':' << aspect.y).str();
+    str::stream ss;
+    ss << aspect.x << ':' << aspect.y;
+    std::string aspect_str = ss.str();
     SetImportError(ed, is_aspect_ok, 
                    std::string(_("Aspect ratio")) + ": \t" + MarkError(aspect_str, is_aspect_ok),
                    BF_(Descriptions[2]) % tv_type % bf::stop);
diff -ruN old/src/mgui/sdk/cairo_utils.cpp new/src/mgui/sdk/cairo_utils.cpp
--- old/src/mgui/sdk/cairo_utils.cpp	2017-06-01 14:25:09.498801438 +0430
+++ new/src/mgui/sdk/cairo_utils.cpp	2017-06-01 14:35:20.831246046 +0430
@@ -27,6 +27,8 @@
 std::string MakeSVGFilename(const char* prefix)
 {
     static int idx = 1;
-    return (str::stream() << prefix << "-" << Mpeg::set_hms() << idx++ << ".svg" ).str();
+    str::stream ss;
+    ss << prefix << "-" << Mpeg::set_hms() << idx++ << ".svg";
+    return ss.str();
 }
 
diff -ruN old/src/mgui/timeline/layout.cpp new/src/mgui/timeline/layout.cpp
--- old/src/mgui/timeline/layout.cpp	2017-06-01 14:25:09.502134734 +0430
+++ new/src/mgui/timeline/layout.cpp	2017-06-01 14:36:36.152095784 +0430
@@ -600,8 +600,10 @@
 void FramesToTime(std::string& str, int cnt, double fps)
 {
     time4_t t4 = FramesToTime(cnt, fps);
-    str = (str::stream() << Mpeg::set_hms() << t4.hh << ":" << Mpeg::set_hms() << t4.mm << ":"
-                         << Mpeg::set_hms() << t4.ss << ";" << Mpeg::set_hms() << t4.ff).str();
+    str::stream ss;
+    ss << Mpeg::set_hms() << t4.hh << ":" << Mpeg::set_hms() << t4.mm << ":"
+      << Mpeg::set_hms() << t4.ss << ";" << Mpeg::set_hms() << t4.ff;
+    str = ss.str();
 }
 
 } // namespace TimeLine
diff -ruN old/src/mgui/win_utils.cpp new/src/mgui/win_utils.cpp
--- old/src/mgui/win_utils.cpp	2017-06-01 14:25:09.498801438 +0430
+++ new/src/mgui/win_utils.cpp	2017-06-01 14:26:50.898112082 +0430
@@ -132,7 +132,9 @@
 
 std::string ColorToString(const unsigned int rgba)
 {
-    return (str::stream() << std::hex << (rgba >> 8)).str();
+    str::stream ss;
+    ss << std::hex << (rgba >> 8);
+    return ss.str();
 }
 
 CR::Color GetBGColor(Gtk::Widget& wdg)
diff -ruN old/src/mdemux/dvdread.cpp new/src/mdemux/dvdread.cpp
--- old/src/mdemux/dvdread.cpp	2017-06-01 14:48:30.110355679 +0430
+++ new/src/mdemux/dvdread.cpp	2017-06-01 14:50:50.141065674 +0430
@@ -35,8 +35,10 @@
 std::string VobFName(VobPos& pos, const std::string& suffix)
 {
     using Mpeg::set_hms;
-    return (str::stream("Video") << set_hms() << int(pos.Vts()) 
-            << "-" << set_hms() << pos.VobId() << suffix << ".vob").str();
+    str::stream ss ("Video");
+    ss << set_hms() << int(pos.Vts()) 
+      << "-" << set_hms() << pos.VobId() << suffix << ".vob";
+    return ss.str();
 }
 
 typedef boost::function<void(int, double)> VobTimeFnr;
@@ -282,9 +284,11 @@
 static void TryDVDReadBlocks(dvd_file_t* file, int off, size_t cnt, char* buf)
 {
     int real_cnt = DVDReadBlocks(file, off, cnt, (unsigned char*)buf);
-    if( (int)cnt != real_cnt )
-        throw std::runtime_error( (str::stream() << real_cnt << 
-                                   " != DVDReadBlocks(" << cnt << ")").str() );
+    if( (int)cnt != real_cnt ) {
+        str::stream ss;
+        ss << real_cnt << " != DVDReadBlocks(" << cnt << ")";
+        throw std::runtime_error( ss.str() );
+    }
 }
 
 // размер буфера должен соответствовать читаемому диапазону
diff -ruN old/src/mdemux/mpeg2demux.cpp new/src/mdemux/mpeg2demux.cpp
--- old/src/mdemux/mpeg2demux.cpp	2017-06-01 14:48:30.110355679 +0430
+++ new/src/mdemux/mpeg2demux.cpp	2017-06-01 14:55:35.784165916 +0430
@@ -71,7 +71,9 @@
 
 static std::string MakePESKey(int id, const char* ext)
 {
-    return (str::stream() << id << "." << ext).str();
+    str::stream ss;
+    ss << id << "." << ext;
+    return ss.str();
 }
 
 static bool ReadPart(io::stream& strm, uint8_t* buf, int sz, int& len)
@@ -110,7 +112,9 @@
         ASSERT(0);
     }
 
-    std::string header_str = (str::stream() << sample_rate << ":" << channels << ":" << bps << ".lpcm").str();
+    str::stream ss;
+    ss << sample_rate << ":" << channels << ":" << bps << ".lpcm";
+    std::string header_str = ss.str();
     return MakePESKey(track, header_str.c_str());
 }
 
diff -ruN old/src/mdemux/seek.cpp new/src/mdemux/seek.cpp
--- old/src/mdemux/seek.cpp	2017-06-01 14:48:30.110355679 +0430
+++ new/src/mdemux/seek.cpp	2017-06-01 14:52:09.669280234 +0430
@@ -37,8 +37,10 @@
     int hh    = min / 60;
     int mm    = min - hh*60;
 
-    return (str::stream() << set_hms() << hh << ":" 
-                          << set_hms() << mm << ":" << set_hms() << ss).str();
+    str::stream strss;
+    strss << set_hms() << hh << ":"
+      << set_hms() << mm << ":" << set_hms() << ss;
+    return strss.str();
 }
 
 bool MediaInfo::InitBegin(VideoLine& vl)
diff -ruN old/src/mlib/sdk/misc.cpp new/src/mlib/sdk/misc.cpp
--- old/src/mlib/sdk/misc.cpp	2017-06-01 14:48:30.120355606 +0430
+++ new/src/mlib/sdk/misc.cpp	2017-06-01 14:53:25.504549937 +0430
@@ -173,12 +173,16 @@
 std::string Double2Str(double val)
 {
     //return boost::format("%1%") % val % bf::stop;
-    return (str::stream() << val).str();
+    str::stream ss;
+    ss << val;
+    return ss.str();
 }
 
 std::string Int2Str(int val)
 {
-    return (str::stream() << val).str();
+    str::stream ss;
+    ss << val;
+    return ss.str();
 }
 
 static bool ICaseMatch(const std::string& str, const std::string& pat_str)
diff -ruN old/src/mlib/sdk/system.cpp new/src/mlib/sdk/system.cpp
--- old/src/mlib/sdk/system.cpp	2017-06-01 14:48:30.120355606 +0430
+++ new/src/mlib/sdk/system.cpp	2017-06-01 14:54:13.980777662 +0430
@@ -28,7 +28,9 @@
 int GetMemSize()
 {
     pid_t pid = getpid();
-    std::string str = (str::stream() << "/proc/" << pid << "/statm").str();
+    str::stream ss;
+    ss << "/proc/" << pid << "/statm";
+    std::string str = ss.str();
 
     io::stream strm(str.c_str(), iof::in);
     int mem;