diff --git a/libavcodec/ffv1.c b/libavcodec/ffv1.c
index 366de02ac8..d2324fa41b 100644
--- a/libavcodec/ffv1.c
+++ b/libavcodec/ffv1.c
@@ -1080,17 +1080,25 @@ static int encode_slice(AVCodecContext *c, void *arg){
     return 0;
 }
 
-static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                        const AVFrame *pict, int *got_packet)
+{
     FFV1Context *f = avctx->priv_data;
     RangeCoder * const c= &f->slice_context[0]->c;
-    AVFrame *pict = data;
     AVFrame * const p= &f->picture;
     int used_count= 0;
     uint8_t keystate=128;
     uint8_t *buf_p;
-    int i;
+    int i, ret;
 
-    ff_init_range_encoder(c, buf, buf_size);
+    if (!pkt->data &&
+        (ret = av_new_packet(pkt, avctx->width*avctx->height*((8*2+1+1)*4)/8
+                                  + FF_MIN_BUFFER_SIZE)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
+        return ret;
+    }
+
+    ff_init_range_encoder(c, pkt->data, pkt->size);
     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
 
     *p = *pict;
@@ -1110,7 +1118,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
     if(!f->ac){
         used_count += ff_rac_terminate(c);
 //printf("pos=%d\n", used_count);
-        init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);
+        init_put_bits(&f->slice_context[0]->pb, pkt->data + used_count, pkt->size - used_count);
     }else if (f->ac>1){
         int i;
         for(i=1; i<256; i++){
@@ -1121,8 +1129,8 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
 
     for(i=1; i<f->slice_count; i++){
         FFV1Context *fs= f->slice_context[i];
-        uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;
-        int len= buf_size/f->slice_count;
+        uint8_t *start = pkt->data + (pkt->size-used_count)*i/f->slice_count;
+        int len = pkt->size/f->slice_count;
 
         if(fs->ac){
             ff_init_range_encoder(&fs->c, start, len);
@@ -1132,7 +1140,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
     }
     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));
 
-    buf_p=buf;
+    buf_p = pkt->data;
     for(i=0; i<f->slice_count; i++){
         FFV1Context *fs= f->slice_context[i];
         int bytes;
@@ -1147,7 +1155,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
             used_count= 0;
         }
         if(i>0){
-            av_assert0(bytes < buf_size/f->slice_count);
+            av_assert0(bytes < pkt->size/f->slice_count);
             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);
             av_assert0(bytes < (1<<24));
             AV_WB24(buf_p+bytes, bytes);
@@ -1200,7 +1208,11 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size,
         avctx->stats_out[0] = '\0';
 
     f->picture_number++;
-    return buf_p-buf;
+    pkt->size   = buf_p - pkt->data;
+    pkt->flags |= AV_PKT_FLAG_KEY*p->key_frame;
+    *got_packet = 1;
+
+    return 0;
 }
 #endif /* CONFIG_FFV1_ENCODER */
 
@@ -1742,7 +1754,7 @@ AVCodec ff_ffv1_encoder = {
     .id             = CODEC_ID_FFV1,
     .priv_data_size = sizeof(FFV1Context),
     .init           = encode_init,
-    .encode         = encode_frame,
+    .encode2        = encode_frame,
     .close          = common_end,
     .capabilities = CODEC_CAP_SLICE_THREADS,
     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_NONE},