flicvideo: support 256-bytes extradata

sample:

http://www.datafilehost.com/download-ab1156a9.html

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/flicvideo.c

@@ -86,6 +86,7 @@ static av_cold int flic_decode_init(AVCodecContext *avctx)
     if (avctx->extradata_size != 0 &&
         avctx->extradata_size != 12 &&
         avctx->extradata_size != 128 &&
+        avctx->extradata_size != 256 &&
         avctx->extradata_size != 904 &&
         avctx->extradata_size != 1024) {
         av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
@@ -109,6 +110,7 @@ static av_cold int flic_decode_init(AVCodecContext *avctx)
         depth = 8;
         /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
     } else if (avctx->extradata_size == 0 ||
+               avctx->extradata_size == 256 ||
         /* see FFmpeg ticket #1234 */
                avctx->extradata_size == 904) {
         s->fli_type = FLI_TYPE_CODE;