Change H264 encoder from baseline to main

.gitignore

@@ -8,3 +8,4 @@ build
 experiments
 subprojects
 sandbox
+.vscode

src/h264-encoder-ffmpeg-impl.c

@@ -310,9 +310,11 @@ static int h264_encoder__init_codec_context(struct h264_encoder_ffmpeg* self,
 	c->global_quality = quality;
 
 	/* open-h264 requires baseline profile, so we use constrained
-	 * baseline.
+	 * baseline: AV_PROFILE_H264_BASELINE.
+	 * But that is not supported by many clients. So we use a "DEFAULT" profile.
+	 * 
 	 */
-	c->profile = 578;
+	c->profile = AV_PROFILE_H264_MAIN;
 
 	return 0;
 }