diff --git a/libavcodec/arm/vp8dsp_armv6.S b/libavcodec/arm/vp8dsp_armv6.S
index fd254ccc30..4047aabc13 100644
--- a/libavcodec/arm/vp8dsp_armv6.S
+++ b/libavcodec/arm/vp8dsp_armv6.S
@@ -124,14 +124,14 @@ function ff_vp8_luma_dc_wht_armv6, export=1
         sbfx            r1,  r9,  #3,  #13
         sbfx            r10, r4,  #3,  #13
 #else
-        sxth            r8,  r8
-        sxth            r7,  r7
-        sxth            r9,  r9
-        sxth            r4,  r4
-        asr             r8,  #3                 @ block[0][0]
-        asr             r7,  #3                 @ block[0][1]
-        asr             r9,  #3                 @ block[0][2]
-        asr             r4,  #3                 @ block[0][3]
+        sxth            r6,  r8
+        sxth            r12, r7
+        sxth            r1,  r9
+        sxth            r10, r4
+        asr             r6,  #3                 @ block[0][0]
+        asr             r12, #3                 @ block[0][1]
+        asr             r1,  #3                 @ block[0][2]
+        asr             r10, #3                 @ block[0][3]
 #endif
 
         strh            r6,  [r0], #32
diff --git a/libavformat/rtp.c b/libavformat/rtp.c
index 952296e379..80e0c7d745 100644
--- a/libavformat/rtp.c
+++ b/libavformat/rtp.c
@@ -107,7 +107,7 @@ int ff_rtp_get_payload_type(AVFormatContext *fmt,
     /* static payload type */
     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
         if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
-            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt ||
+            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat ||
                 !fmt->oformat->priv_class || !fmt->priv_data ||
                 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190")))
                 continue;
diff --git a/libavformat/rtpenc_chain.c b/libavformat/rtpenc_chain.c
index df7410d0c8..70d68ce534 100644
--- a/libavformat/rtpenc_chain.c
+++ b/libavformat/rtpenc_chain.c
@@ -64,7 +64,7 @@ int ff_rtp_chain_mux_open(AVFormatContext **out, AVFormatContext *s,
     /* Get the payload type from the codec */
     if (st->id < RTP_PT_PRIVATE)
         rtpctx->streams[0]->id =
-            ff_rtp_get_payload_type(rtpctx, st->codec, idx);
+            ff_rtp_get_payload_type(s, st->codec, idx);
     else
         rtpctx->streams[0]->id = st->id;
 
diff --git a/libavresample/audio_mix.c b/libavresample/audio_mix.c
index 2b3d9f1f7a..c0560288a5 100644
--- a/libavresample/audio_mix.c
+++ b/libavresample/audio_mix.c
@@ -401,10 +401,6 @@ AudioMix *ff_audio_mix_alloc(AVAudioResampleContext *avr)
         av_free(matrix_dbl);
     }
 
-    ret = mix_function_init(am);
-    if (ret < 0)
-        goto error;
-
     return am;
 
 error:
@@ -544,8 +540,5 @@ int ff_audio_mix_set_matrix(AudioMix *am, const double *matrix, int stride)
         return AVERROR(EINVAL);
     }
 
-    /* TODO: detect situations where we can just swap around pointers
-             instead of doing matrix multiplications with 0.0 and 1.0 */
-
-    return 0;
+    return mix_function_init(am);
 }