ffmpeg.c: Add output file index and stream index to vstats file.

Signed-off-by: Sasi Inguva <isasi@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

doc/ffmpeg.texi

@@ -637,9 +637,15 @@ Dump video coding statistics to @file{vstats_HHMMSS.log}.
 @item -vstats_file @var{file}
 Dump video coding statistics to @var{file}.
 @item -vstats_version @var{file}
-Specifies which version of the vstats format to use. If version is 1, format is
+Specifies which version of the vstats format to use. Default is 2.
+
+version = 1 :
 
 @code{frame= %5d q= %2.1f PSNR= %6.2f f_size= %6d s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s}
+
+version > 1:
+
+@code{out= %2d st= %2d frame= %5d q= %2.1f PSNR= %6.2f f_size= %6d s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s}
 @item -top[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
 top=1/bottom=0/auto=-1 field first
 @item -dc @var{precision}

ffmpeg.c

@@ -1347,8 +1347,13 @@ static void do_video_stats(OutputStream *ost, int frame_size)
     enc = ost->enc_ctx;
     if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
         frame_number = ost->st->nb_frames;
-        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number,
-                ost->quality / (float)FF_QP2LAMBDA);
+        if (vstats_version <= 1) {
+            fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number,
+                    ost->quality / (float)FF_QP2LAMBDA);
+        } else  {
+            fprintf(vstats_file, "out= %2d st= %2d frame= %5d q= %2.1f ", ost->file_index, ost->index, frame_number,
+                    ost->quality / (float)FF_QP2LAMBDA);
+        }
 
         if (ost->error[0]>=0 && (enc->flags & AV_CODEC_FLAG_PSNR))
             fprintf(vstats_file, "PSNR= %6.2f ", psnr(ost->error[0] / (enc->width * enc->height * 255.0 * 255.0)));

ffmpeg_opt.c

@@ -121,7 +121,7 @@ int frame_bits_per_raw_sample = 0;
 float max_error_rate  = 2.0/3;
 int filter_nbthreads = 0;
 int filter_complex_nbthreads = 0;
-int vstats_version = 1;
+int vstats_version = 2;
 
 
 static int intra_only         = 0;