hlsenc: Set the default codecs to AAC and H264

Most HLS implementation only support these codecs.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/hlsenc.c

@@ -342,8 +342,8 @@ AVOutputFormat ff_hls_muxer = {
     .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
     .extensions     = "m3u8",
     .priv_data_size = sizeof(HLSContext),
-    .audio_codec    = AV_CODEC_ID_MP2,
-    .video_codec    = AV_CODEC_ID_MPEG2VIDEO,
+    .audio_codec    = AV_CODEC_ID_AAC,
+    .video_codec    = AV_CODEC_ID_H264,
     .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
     .write_header   = hls_write_header,
     .write_packet   = hls_write_packet,