fix recording in stereo conferences

src/mod/applications/mod_conference/mod_conference.c

@@ -4685,7 +4685,7 @@ static void *SWITCH_THREAD_FUNC conference_record_thread_run(switch_thread_t *th
 			//low_count = 0;
 
 			if ((rlen = (uint32_t) switch_buffer_read(member->mux_buffer, data_buf, data_buf_len))) {
-				len = (switch_size_t) rlen / sizeof(int16_t);
+				len = (switch_size_t) rlen / sizeof(int16_t) / conference->channels;
 				no_data = 0;
 			}
 			switch_mutex_unlock(member->audio_out_mutex);
@@ -4723,7 +4723,7 @@ static void *SWITCH_THREAD_FUNC conference_record_thread_run(switch_thread_t *th
 	while(!no_data) {
 		switch_mutex_lock(member->audio_out_mutex);
 		if ((rlen = (uint32_t) switch_buffer_read(member->mux_buffer, data_buf, data_buf_len))) {
-			len = (switch_size_t) rlen / sizeof(int16_t);
+			len = (switch_size_t) rlen / sizeof(int16_t)/ conference->channels;
 			switch_core_file_write(&fh, data_buf, &len);
 		} else {
 			no_data = 1;