Merge remote-tracking branch 'qatar/master'

* qatar/master:
  pthread: add some malloc failure checks
  avconv: cosmetics, reformat transcode_init()
  avconv: rename 'os' variable to 'oc'
  doc/filters: fix some typos.
  configure: add libpulse to help output

Conflicts:
	avconv.c
	configure
Merged-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -184,6 +184,7 @@ External library support:
   --enable-libnut          enable NUT (de)muxing via libnut,
                            native (de)muxer exists [no]
   --enable-libopenjpeg     enable JPEG 2000 encoding/decoding via OpenJPEG [no]
+  --enable-libpulse        enable Pulseaudio input via libpulse [no]
   --enable-librtmp         enable RTMP[E] support via librtmp [no]
   --enable-libschroedinger enable Dirac support via libschroedinger [no]
   --enable-libspeex        enable Speex support via libspeex [no]

libavcodec/pthread.c

@@ -724,6 +724,11 @@ static int frame_thread_init(AVCodecContext *avctx)
         p->parent = fctx;
         p->avctx  = copy;
 
+        if (!copy) {
+            err = AVERROR(ENOMEM);
+            goto error;
+        }
+
         *copy = *src;
         copy->thread_opaque = p;
         copy->pkt = &p->avpkt;
@@ -737,6 +742,10 @@ static int frame_thread_init(AVCodecContext *avctx)
             update_context_from_thread(avctx, copy, 1);
         } else {
             copy->priv_data = av_malloc(codec->priv_data_size);
+            if (!copy->priv_data) {
+                err = AVERROR(ENOMEM);
+                goto error;
+            }
             memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
             copy->internal = av_malloc(sizeof(AVCodecInternal));
             if (!copy->internal) {