Flush the buffer after writing the header and when done with writing the files

Fixes writing small (~4kb) files.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16650 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/matroskaenc.c

@@ -708,6 +708,7 @@ static int mkv_write_header(AVFormatContext *s)
     if (mkv->cues == NULL)
         return AVERROR(ENOMEM);
 
+    put_flush_packet(pb);
     return 0;
 }
 
@@ -888,6 +889,7 @@ static int mkv_write_trailer(AVFormatContext *s)
 
     end_ebml_master(pb, mkv->segment);
     av_free(mkv->md5_ctx);
+    put_flush_packet(pb);
     return 0;
 }