ffmpeg: move field order decision making to encoder initialization

We now have the possibility of getting AVFrames here, and we should not touch the muxer's codecpar after writing the header. Results of FATE tests change as the MXF and Matroska muxers actually write down the field/frame coding type of a stream in their respective headers. Before this change, these values in codecpar would only be set after the muxer was initialized. Now, the information is also available for encoder and muxer initialization.
FFmpeg · Oct 29, 2020 · fbb44bc · fbb44bc
1 parent 7369595
commit fbb44bc
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Showing 5 changed files with 19 additions and 18 deletions.
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
@@ -1123,7 +1123,6 @@ static void do_video_out(OutputFile *of,
     int ret, format_video_sync;
     AVPacket pkt;
     AVCodecContext *enc = ost->enc_ctx;
-    AVCodecParameters *mux_par = ost->st->codecpar;
     AVRational frame_rate;
     int nb_frames, nb0_frames, i;
     double delta, delta0;
@@ -1285,18 +1284,6 @@ static void do_video_out(OutputFile *of,
         if (!check_recording_time(ost))
             return;
 
-        if (enc->flags & (AV_CODEC_FLAG_INTERLACED_DCT | AV_CODEC_FLAG_INTERLACED_ME) &&
-            ost->top_field_first >= 0)
-            in_picture->top_field_first = !!ost->top_field_first;
-
-        if (in_picture->interlaced_frame) {
-            if (enc->codec->id == AV_CODEC_ID_MJPEG)
-                mux_par->field_order = in_picture->top_field_first ? AV_FIELD_TT:AV_FIELD_BB;
-            else
-                mux_par->field_order = in_picture->top_field_first ? AV_FIELD_TB:AV_FIELD_BT;
-        } else
-            mux_par->field_order = AV_FIELD_PROGRESSIVE;
-
         in_picture->quality = enc->global_quality;
         in_picture->pict_type = 0;
 
@@ -3433,6 +3420,20 @@ static int init_output_stream_encode(OutputStream *ost, AVFrame *frame)
             enc_ctx->field_order = AV_FIELD_TT;
         }
 
+        if (frame) {
+            if (enc_ctx->flags & (AV_CODEC_FLAG_INTERLACED_DCT | AV_CODEC_FLAG_INTERLACED_ME) &&
+                ost->top_field_first >= 0)
+                frame->top_field_first = !!ost->top_field_first;
+
+            if (frame->interlaced_frame) {
+                if (enc_ctx->codec->id == AV_CODEC_ID_MJPEG)
+                    enc_ctx->field_order = frame->top_field_first ? AV_FIELD_TT:AV_FIELD_BB;
+                else
+                    enc_ctx->field_order = frame->top_field_first ? AV_FIELD_TB:AV_FIELD_BT;
+            } else
+                enc_ctx->field_order = AV_FIELD_PROGRESSIVE;
+        }
+
         if (ost->forced_keyframes) {
             if (!strncmp(ost->forced_keyframes, "expr:", 5)) {
                 ret = av_expr_parse(&ost->forced_keyframes_pexpr, ost->forced_keyframes+5,

diff --git a/tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10 b/tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10
@@ -1 +1 @@
-d66177ea3922692bc91cd0f8aa907650 *tests/data/fate/concat-demuxer-extended-lavf-mxf_d10.ffprobe
+84496cfe2d668db395280ea67e5c6fbe *tests/data/fate/concat-demuxer-extended-lavf-mxf_d10.ffprobe
diff --git a/tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10 b/tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10
@@ -78,5 +78,5 @@ video|0|34|1.360000|34|1.360000|1|0.040000|N/A|N/A|150000|1924096|K_|1
 Strings Metadata
 audio|1|65280|1.360000|65280|1.360000|1920|0.040000|N/A|N/A|7680|2074624|K_|1
 Strings Metadata
-0|mpeg2video|0|video|1/25|[0][0][0][0]|0x0000|720|608|0|0|0|0|1:1|45:38|yuv422p|5|tv|unknown|unknown|unknown|topleft|tt|N/A|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|0|0|0|0|0|0|0|0|0|0|0|0|0x060A2B340101010501010D001300000000000000000000000000000000000001
+0|mpeg2video|0|video|1/25|[0][0][0][0]|0x0000|720|608|0|0|0|0|1:1|45:38|yuv422p|5|tv|unknown|unknown|unknown|topleft|tb|N/A|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|0|0|0|0|0|0|0|0|0|0|0|0|0x060A2B340101010501010D001300000000000000000000000000000000000001
 1|pcm_s16le|unknown|audio|1/48000|[0][0][0][0]|0x0000|s16|48000|2|unknown|16|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|0x060A2B340101010501010D001300000000000000000000000000000000000001
diff --git a/tests/ref/fate/rgb24-mkv b/tests/ref/fate/rgb24-mkv
@@ -1,5 +1,5 @@
-fdc02d700dbe99315a9f0d928a9b935e *tests/data/fate/rgb24-mkv.matroska
-58213 tests/data/fate/rgb24-mkv.matroska
+fde8903c4df0ba8235dafcfd8a2f368c *tests/data/fate/rgb24-mkv.matroska
+58216 tests/data/fate/rgb24-mkv.matroska
 #tb 0: 1/10
 #media_type 0: video
 #codec_id 0: rawvideo

diff --git a/tests/ref/lavf/mxf_d10 b/tests/ref/lavf/mxf_d10
@@ -1,3 +1,3 @@
-36fc2a640368f6d33987d2b2d39df966 *tests/data/lavf/lavf.mxf_d10
+da0ebbebb50a530b14c0f06017f464b3 *tests/data/lavf/lavf.mxf_d10
 5332013 tests/data/lavf/lavf.mxf_d10
 tests/data/lavf/lavf.mxf_d10 CRC=0x6c74d488