Fix FFM-based streaming from ffmpeg to ffserver. The basic problem is that

we'd memset() the codec context to zero, thereby setting audio input to U8
and video to YUV420P. For most video encoders, that actually works, but for
most audio codecs, it doesn't. This patch changes defaults to those set by
avcodec_context_get_defaults() and have ffmpeg figure out the optimal encoding
format itself if not set explicitely (as it does for the non-ffserver-cases
also).

Originally committed as revision 22751 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -515,6 +515,7 @@ static int read_ffserver_streams(AVFormatContext *s, const char *filename)
     s->nb_streams = ic->nb_streams;
     for(i=0;i<ic->nb_streams;i++) {
         AVStream *st;
+        AVCodec *codec;
 
         // FIXME: a more elegant solution is needed
         st = av_mallocz(sizeof(AVStream));
@@ -524,13 +525,21 @@ static int read_ffserver_streams(AVFormatContext *s, const char *filename)
             print_error(filename, AVERROR(ENOMEM));
             av_exit(1);
         }
-        memcpy(st->codec, ic->streams[i]->codec, sizeof(AVCodecContext));
+        avcodec_copy_context(st->codec, ic->streams[i]->codec);
         s->streams[i] = st;
 
-        if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && audio_stream_copy)
-            st->stream_copy = 1;
-        else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && video_stream_copy)
-            st->stream_copy = 1;
+        codec = avcodec_find_encoder(st->codec->codec_id);
+        if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+            if (audio_stream_copy) {
+                st->stream_copy = 1;
+            } else
+                choose_sample_fmt(st, codec);
+        } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+            if (video_stream_copy) {
+                st->stream_copy = 1;
+            } else
+                choose_pixel_fmt(st, codec);
+        }
 
         if(!st->codec->thread_count)
             st->codec->thread_count = 1;

ffserver.c

@@ -4039,7 +4039,6 @@ static int parse_ffconfig(const char *filename)
                         filename, line_num);
             } else {
                 FFStream *s;
-                const AVClass *class;
                 stream = av_mallocz(sizeof(FFStream));
                 get_arg(stream->filename, sizeof(stream->filename), &p);
                 q = strrchr(stream->filename, '>');
@@ -4055,15 +4054,8 @@ static int parse_ffconfig(const char *filename)
                 }
 
                 stream->fmt = ffserver_guess_format(NULL, stream->filename, NULL);
-                /* fetch avclass so AVOption works
-                 * FIXME try to use avcodec_get_context_defaults2
-                 * without changing defaults too much */
-                avcodec_get_context_defaults(&video_enc);
-                class = video_enc.av_class;
-                memset(&audio_enc, 0, sizeof(AVCodecContext));
-                memset(&video_enc, 0, sizeof(AVCodecContext));
-                audio_enc.av_class = class;
-                video_enc.av_class = class;
+                avcodec_get_context_defaults2(&video_enc, AVMEDIA_TYPE_VIDEO);
+                avcodec_get_context_defaults2(&audio_enc, AVMEDIA_TYPE_AUDIO);
                 audio_id = CODEC_ID_NONE;
                 video_id = CODEC_ID_NONE;
                 if (stream->fmt) {