diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c
index 0fd29ecb89..5b2c2e436c 100644
--- a/libavcodec/pngenc.c
+++ b/libavcodec/pngenc.c
@@ -219,7 +219,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     PNGEncContext *s = avctx->priv_data;
     AVFrame * const p= &s->picture;
     int bit_depth, color_type, y, len, row_size, ret, is_progressive;
-    int bits_per_pixel, pass_row_size, max_packet_size;
+    int bits_per_pixel, pass_row_size, enc_row_size, max_packet_size;
     int compression_level;
     uint8_t *ptr, *top;
     uint8_t *crow_base = NULL, *crow_buf, *crow;
@@ -230,15 +230,6 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     p->pict_type= AV_PICTURE_TYPE_I;
     p->key_frame= 1;
 
-    max_packet_size = avctx->width * avctx->height * 9 + FF_MIN_BUFFER_SIZE;
-    if ((ret = ff_alloc_packet2(avctx, pkt, max_packet_size)) < 0) {
-        return ret;
-    }
-
-    s->bytestream_start =
-    s->bytestream       = pkt->data;
-    s->bytestream_end   = pkt->data + pkt->size;
-
     is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
     switch(avctx->pix_fmt) {
     case PIX_FMT_RGBA64BE:
@@ -293,6 +284,19 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                        Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
     if (ret != Z_OK)
         return -1;
+
+    enc_row_size    = deflateBound(&s->zstream, row_size);
+    max_packet_size = avctx->height * (enc_row_size +
+                                       ((enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) * 12)
+                      + FF_MIN_BUFFER_SIZE;
+    if ((ret = ff_alloc_packet2(avctx, pkt, max_packet_size)) < 0) {
+        return ret;
+    }
+
+    s->bytestream_start =
+    s->bytestream       = pkt->data;
+    s->bytestream_end   = pkt->data + pkt->size;
+
     crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
     if (!crow_base)
         goto fail;
diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index 326bfbaac1..2137722b6a 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -1229,7 +1229,7 @@ static int decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr,
     }
 
     *(AVFrame *)data = s->frame;
-    *got_frame_ptr   = 1;
+    *got_frame_ptr   = s->frame.nb_samples > 0;
     s->packet_offset = get_bits_count(gb) & 7;
 
     return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3;
@@ -1243,6 +1243,6 @@ AVCodec ff_wmalossless_decoder = {
     .priv_data_size = sizeof(WmallDecodeCtx),
     .init           = decode_init,
     .decode         = decode_packet,
-    .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
+    .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1 | CODEC_CAP_DELAY,
     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio Lossless"),
 };
diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index 1ee3726240..212b330931 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -112,47 +112,48 @@ static unsigned int get_aiff_header(AVFormatContext *s, int size,
     codec->sample_rate = sample_rate;
     size -= 18;
 
-    /* Got an AIFF-C? */
+    /* get codec id for AIFF-C */
     if (version == AIFF_C_VERSION1) {
         codec->codec_tag = avio_rl32(pb);
         codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
+        size -= 4;
+    }
 
+    if (version != AIFF_C_VERSION1 || codec->codec_id == CODEC_ID_PCM_S16BE) {
+        codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
+        codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
+        aiff->block_duration = 1;
+    } else {
         switch (codec->codec_id) {
-        case CODEC_ID_PCM_S16BE:
-            codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
-            codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
+        case CODEC_ID_PCM_F32BE:
+        case CODEC_ID_PCM_F64BE:
+        case CODEC_ID_PCM_S16LE:
+        case CODEC_ID_PCM_ALAW:
+        case CODEC_ID_PCM_MULAW:
             aiff->block_duration = 1;
             break;
         case CODEC_ID_ADPCM_IMA_QT:
             codec->block_align = 34*codec->channels;
-            aiff->block_duration = 64;
             break;
         case CODEC_ID_MACE3:
             codec->block_align = 2*codec->channels;
-            aiff->block_duration = 6;
             break;
         case CODEC_ID_MACE6:
             codec->block_align = 1*codec->channels;
-            aiff->block_duration = 6;
             break;
         case CODEC_ID_GSM:
             codec->block_align = 33;
-            aiff->block_duration = 160;
             break;
         case CODEC_ID_QCELP:
             codec->block_align = 35;
-            aiff->block_duration = 160;
             break;
         default:
             aiff->block_duration = 1;
             break;
         }
-        size -= 4;
-    } else {
-        /* Need the codec type */
-        codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
-        codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
-        aiff->block_duration = 1;
+        if (codec->block_align > 0)
+            aiff->block_duration = av_get_audio_frame_duration(codec,
+                                                               codec->block_align);
     }
 
     /* Block align needs to be computed in all cases, as the definition
@@ -160,8 +161,10 @@ static unsigned int get_aiff_header(AVFormatContext *s, int size,
     if (!codec->block_align)
         codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
 
-    codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
-                      aiff->block_duration;
+    if (aiff->block_duration) {
+        codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
+                          aiff->block_duration;
+    }
 
     /* Chunk is over */
     if (size)
diff --git a/tests/fate/lossless-video.mak b/tests/fate/lossless-video.mak
index bf2df177de..9293b96b54 100644
--- a/tests/fate/lossless-video.mak
+++ b/tests/fate/lossless-video.mak
@@ -24,3 +24,4 @@ fate-zerocodec: CMD = framecrc -i $(SAMPLES)/zerocodec/sample-zeco.avi
 
 FATE_TESTS += $(FATE_LOSSLESS_VIDEO)
 fate-lossless-video: $(FATE_LOSSLESS_VIDEO)
+