avformat/mux_utils: Don't report that AV_CODEC_ID_NONE can be muxed

If AVOutputFormat.video_codec, audio_codec or subtitle_codec
is AV_CODEC_ID_NONE, it means that there is no default codec
for this format and not that it is supported to mux AV_CODEC_ID_NONE.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/mux_utils.c

@@ -39,9 +39,10 @@ int avformat_query_codec(const AVOutputFormat *ofmt, enum AVCodecID codec_id,
             return ffofmt(ofmt)->query_codec(codec_id, std_compliance);
         else if (ofmt->codec_tag)
             return !!av_codec_get_tag2(ofmt->codec_tag, codec_id, &codec_tag);
-        else if (codec_id == ofmt->video_codec ||
-                 codec_id == ofmt->audio_codec ||
-                 codec_id == ofmt->subtitle_codec)
+        else if (codec_id != AV_CODEC_ID_NONE &&
+                 (codec_id == ofmt->video_codec ||
+                  codec_id == ofmt->audio_codec ||
+                  codec_id == ofmt->subtitle_codec))
             return 1;
     }
     return AVERROR_PATCHWELCOME;