fftools/ffmpeg: delete the unused code.

There are come from 2012 ago and have never been used from this
time.
Signed-off-by: Jun Zhao <mypopydev@gmail.com>

fftools/ffmpeg.c

@@ -1485,8 +1485,6 @@ static int reap_filters(int flush)
                     av_rescale_q(filtered_frame->pts, filter_tb, enc->time_base) -
                     av_rescale_q(start_time, AV_TIME_BASE_Q, enc->time_base);
             }
-            //if (ost->source_index >= 0)
-            //    *filtered_frame= *input_streams[ost->source_index]->decoded_frame; //for me_threshold
 
             switch (av_buffersink_get_type(filter)) {
             case AVMEDIA_TYPE_VIDEO:
@@ -3340,7 +3338,7 @@ static int init_output_stream_encode(OutputStream *ost)
                    "if you want a different framerate.\n",
                    ost->file_index, ost->index);
         }
-//      ost->frame_rate = ist->st->avg_frame_rate.num ? ist->st->avg_frame_rate : (AVRational){25, 1};
+
         if (ost->enc->supported_framerates && !ost->force_fps) {
             int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates);
             ost->frame_rate = ost->enc->supported_framerates[idx];
@@ -4879,11 +4877,6 @@ int main(int argc, char **argv)
         exit_program(1);
     }
 
-//     if (nb_input_files == 0) {
-//         av_log(NULL, AV_LOG_FATAL, "At least one input file must be specified\n");
-//         exit_program(1);
-//     }
-
     for (i = 0; i < nb_output_files; i++) {
         if (strcmp(output_files[i]->ctx->oformat->name, "rtp"))
             want_sdp = 0;