lavc/snow: only allocate mconly_picture for decoding

It is not used in the encoder.

1 files changed, 8 insertions, 4 deletions

diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index 0a500695ce..97b0448dbf 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -513,16 +513,20 @@ int ff_snow_common_init_after_header(AVCodecContext *avctx) {
     int ret, emu_buf_size;
 
     if(!s->scratchbuf) {
-        if ((ret = ff_get_buffer(s->avctx, s->mconly_picture,
-                                 AV_GET_BUFFER_FLAG_REF)) < 0)
-            return ret;
+        if (av_codec_is_decoder(avctx->codec)) {
+            if ((ret = ff_get_buffer(s->avctx, s->mconly_picture,
+                                     AV_GET_BUFFER_FLAG_REF)) < 0)
+                return ret;
+        }
+
         emu_buf_size = FFMAX(s->mconly_picture->linesize[0], 2*avctx->width+256) * (2 * MB_SIZE + HTAPS_MAX - 1);
         if (!FF_ALLOCZ_TYPED_ARRAY(s->scratchbuf,      FFMAX(s->mconly_picture->linesize[0], 2*avctx->width+256) * 7 * MB_SIZE) ||
             !FF_ALLOCZ_TYPED_ARRAY(s->emu_edge_buffer, emu_buf_size))
             return AVERROR(ENOMEM);
     }
 
-    if(s->mconly_picture->format != avctx->pix_fmt) {
+    if (av_codec_is_decoder(avctx->codec) &&
+        s->mconly_picture->format != avctx->pix_fmt) {
         av_log(avctx, AV_LOG_ERROR, "pixel format changed\n");
         return AVERROR_INVALIDDATA;
     }