Don't complain about codec2's 700 bit/s modes in ffmpeg.c

fftools/ffmpeg.c

@@ -3502,7 +3502,8 @@ static int init_output_stream(OutputStream *ost, char *error, int error_len)
             av_buffersink_set_frame_size(ost->filter->filter,
                                             ost->enc_ctx->frame_size);
         assert_avoptions(ost->encoder_opts);
-        if (ost->enc_ctx->bit_rate && ost->enc_ctx->bit_rate < 1000)
+        if (ost->enc_ctx->bit_rate && ost->enc_ctx->bit_rate < 1000 &&
+            ost->enc_ctx->codec_id != AV_CODEC_ID_CODEC2 /* don't complain about 700 bit/s modes */)
             av_log(NULL, AV_LOG_WARNING, "The bitrate parameter is set too low."
                                          " It takes bits/s as argument, not kbits/s\n");