MpegEncContext *s2 = &s->mpeg_enc_ctx;
ff_mpv_decode_defaults(s2);
+
+ if ( avctx->codec_tag != AV_RL32("VCR2")
+ && avctx->codec_tag != AV_RL32("BW10"))
+ avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
ff_mpv_decode_init(s2, avctx);
s->mpeg_enc_ctx.avctx = avctx;