output right duration if start or end time are specified

src/ffmpeg2theora.c

@@ -2474,7 +2474,10 @@ int main(int argc, char **argv) {
                     return(1);
                 }
                 if (convert->context->duration != AV_NOPTS_VALUE) {
-                    info.duration = (double)convert->context->duration / AV_TIME_BASE;
+                    info.duration = (double)convert->context->duration / AV_TIME_BASE - \
+                                            convert->start_time;
+                    if (convert->end_time)
+                        info.duration = convert->end_time - convert->start_time;
                 }
                 for(info.passno=(info.twopass==3?1:info.twopass);info.passno<=(info.twopass==3?2:info.twopass);info.passno++){
                     ff2theora_output(convert);

src/theorautils.c

@@ -720,7 +720,7 @@ static void print_stats(oggmux_info *info, double timebase) {
             last = timebase;
             if (info->frontend) {
                 fprintf(info->frontend, "{\"duration\": %lf, \"position\": %.02lf, \"remaining\": %.02lf}\n",
-                    (double)info->duration,
+                    info->duration,
                     timebase,
                     remaining
                 );
@@ -738,7 +738,7 @@ static void print_stats(oggmux_info *info, double timebase) {
         last = timebase;
         if (info->frontend) {
             fprintf(info->frontend, "{\"duration\": %lf, \"position\": %.02lf, \"audio_kbps\":  %d, \"video_kbps\": %d, \"remaining\": %.02lf}\n",
-                (double)info->duration,
+                info->duration,
                 timebase,
                 info->akbps, info->vkbps,
                 remaining