mpeg12: Always invoke the get_format() callback

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/mpeg12dec.c

@@ -1181,10 +1181,21 @@ static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
     AV_PIX_FMT_NONE
 };
 
+static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
+    AV_PIX_FMT_YUV422P,
+    AV_PIX_FMT_NONE
+};
+
+static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
+    AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_NONE
+};
+
 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
 {
     Mpeg1Context *s1  = avctx->priv_data;
     MpegEncContext *s = &s1->mpeg_enc_ctx;
+    const enum AVPixelFormat *pix_fmts;
 
 #if FF_API_XVMC
 FF_DISABLE_DEPRECATION_WARNINGS
@@ -1194,11 +1205,13 @@ FF_ENABLE_DEPRECATION_WARNINGS
 #endif /* FF_API_XVMC */
 
     if (s->chroma_format < 2)
-        return ff_get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
+        pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
     else if (s->chroma_format == 2)
-        return AV_PIX_FMT_YUV422P;
+        pix_fmts = mpeg12_pixfmt_list_422;
     else
-        return AV_PIX_FMT_YUV444P;
+        pix_fmts = mpeg12_pixfmt_list_444;
+
+    return ff_get_format(avctx, pix_fmts);
 }
 
 /* Call this function when we know all parameters.