fftools/ffmpeg_filter: do not pass the entire AVCodecContext to choose_pixel_fmt()

It only uses strict_std_compliance, so pass just that value. Makes it
more clear what fields are accessed.

fftools/ffmpeg_filter.c

@@ -52,8 +52,9 @@ static const enum AVPixelFormat *get_compliance_normal_pix_fmts(const AVCodec *c
     }
 }
 
-static enum AVPixelFormat choose_pixel_fmt(AVCodecContext *enc_ctx,
-                                    const AVCodec *codec, enum AVPixelFormat target)
+static enum AVPixelFormat
+choose_pixel_fmt(const AVCodec *codec, enum AVPixelFormat target,
+                 int strict_std_compliance)
 {
     if (codec && codec->pix_fmts) {
         const enum AVPixelFormat *p = codec->pix_fmts;
@@ -62,7 +63,7 @@ static enum AVPixelFormat choose_pixel_fmt(AVCodecContext *enc_ctx,
         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
         enum AVPixelFormat best= AV_PIX_FMT_NONE;
 
-        if (enc_ctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
+        if (strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
             p = get_compliance_normal_pix_fmts(codec, p);
         }
         for (; *p != AV_PIX_FMT_NONE; p++) {
@@ -102,7 +103,8 @@ static const char *choose_pix_fmts(OutputFilter *ofilter, AVBPrint *bprint)
         return av_get_pix_fmt_name(ost->enc_ctx->pix_fmt);
     }
     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
-        return av_get_pix_fmt_name(choose_pixel_fmt(ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt));
+        return av_get_pix_fmt_name(choose_pixel_fmt(ost->enc, ost->enc_ctx->pix_fmt,
+                                                    ost->enc_ctx->strict_std_compliance));
     } else if (ost->enc && ost->enc->pix_fmts) {
         const enum AVPixelFormat *p;