fftools/ffmpeg_enc: apply -top to individual encoded frames

Fixes #9339.

(Adapted from commit 43a0004b5c)

fftools/ffmpeg.c

@@ -1337,6 +1337,9 @@ static void do_video_out(OutputFile *of,
         in_picture->quality = enc->global_quality;
         in_picture->pict_type = forced_kf_apply(ost, &ost->kf, enc->time_base, in_picture, i);
 
+        if (ost->top_field_first >= 0)
+            in_picture->top_field_first = !!ost->top_field_first;
+
         ret = submit_encode_frame(of, ost, in_picture);
         if (ret == AVERROR_EOF)
             break;

tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10

@@ -1 +1 @@
-9583eaa1d52e977c75da2ab3f14225c8 *tests/data/fate/concat-demuxer-extended-lavf-mxf_d10.ffprobe
+8e95ee1001700a251bf5019cb2757729 *tests/data/fate/concat-demuxer-extended-lavf-mxf_d10.ffprobe

tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10

@@ -68,5 +68,5 @@ video|0|33|1.320000|33|1.320000|1|0.040000|150000|1711104|K__|1|Strings Metadata
 audio|1|63360|1.320000|63360|1.320000|1920|0.040000|7680|1861632|K__|1|Strings Metadata
 video|0|34|1.360000|34|1.360000|1|0.040000|150000|1924096|K__|1|Strings Metadata
 audio|1|65280|1.360000|65280|1.360000|1920|0.040000|7680|2074624|K__|1|Strings Metadata
-0|mpeg2video|0|video|[0][0][0][0]|0x0000|720|608|0|0|0|0|0|1:1|45:38|yuv422p|5|tv|unknown|unknown|unknown|topleft|tb|1|N/A|25/1|25/1|1/25|0|0.000000|N/A|N/A|30000000|N/A|N/A|N/A|N/A|35|22|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0x060A2B340101010501010D001300000000000000000000000000000000000001|CPB properties|30000000|0|0|1212416|-1
+0|mpeg2video|0|video|[0][0][0][0]|0x0000|720|608|0|0|0|0|0|1:1|45:38|yuv422p|5|tv|unknown|unknown|unknown|topleft|tt|1|N/A|25/1|25/1|1/25|0|0.000000|N/A|N/A|30000000|N/A|N/A|N/A|N/A|35|22|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0x060A2B340101010501010D001300000000000000000000000000000000000001|CPB properties|30000000|0|0|1212416|-1
 1|pcm_s16le|unknown|audio|[0][0][0][0]|0x0000|s16|48000|2|unknown|16|0|N/A|0/0|0/0|1/48000|0|0.000000|N/A|N/A|1536000|N/A|N/A|N/A|N/A|35|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0x060A2B340101010501010D001300000000000000000000000000000000000001

tests/ref/lavf/mxf_d10

@@ -1,3 +1,3 @@
-74269c0a64b19269b127f64f3ce7fa6a *tests/data/lavf/lavf.mxf_d10
+963758bdb2a5d64f4e68c205fc5aba96 *tests/data/lavf/lavf.mxf_d10
 5332013 tests/data/lavf/lavf.mxf_d10
 tests/data/lavf/lavf.mxf_d10 CRC=0x6c74d488