@@ -1390,6 +1390,14 @@ static void print_report(AVFormatContext **output_files,

     }

 }

+static void generate_silence(uint8_t* buf, enum AVSampleFormat sample_fmt, size_t size)

+{

+    int fill_char = 0x00;

+    if (sample_fmt == AV_SAMPLE_FMT_U8)

+        fill_char = 0x80;

+    memset(buf, fill_char, size);

+}

+

 /* pkt = NULL means EOF (needed to flush decoder buffers) */

 static int output_packet(AVInputStream *ist, int ist_index,

                          AVOutputStream **ost_table, int nb_ostreams,

@@ -1732,7 +1740,7 @@ static int output_packet(AVInputStream *ist, int ist_index,

                                     int frame_bytes = enc->frame_size*osize*enc->channels;

                                     if (allocated_audio_buf_size < frame_bytes)

                                         ffmpeg_exit(1);

-                                    memset(audio_buf+fifo_bytes, 0, frame_bytes - fifo_bytes);

+                                    generate_silence(audio_buf+fifo_bytes, enc->sample_fmt, frame_bytes - fifo_bytes);

                                 }

                                 ret = avcodec_encode_audio(enc, bit_buffer, bit_buffer_size, (short *)audio_buf);