[ffmpeg] - patch file for PGS subtitle fixes

lib/ffmpeg/patches/0032-PGS-use-the-PTS-from-the-presentation-segment.patch

@@ -0,0 +1,64 @@
+diff --git a/lib/ffmpeg/libavcodec/pgssubdec.c b/lib/ffmpeg/libavcodec/pgssubdec.c
+index 2785d25..02e650a 100644
+--- a/lib/ffmpeg/libavcodec/pgssubdec.c
++++ b/lib/ffmpeg/libavcodec/pgssubdec.c
+@@ -64,6 +64,7 @@ typedef struct PGSSubContext {
+     PGSSubPresentation presentation;
+     uint32_t           clut[256];
+     PGSSubPicture      pictures[UINT16_MAX];
++    int64_t            pts;
+ } PGSSubContext;
+
+ static av_cold int init_decoder(AVCodecContext *avctx)
+@@ -377,6 +378,7 @@ static int display_end_segment(AVCodecContext *avctx, void *data,
+ {
+     AVSubtitle    *sub = data;
+     PGSSubContext *ctx = avctx->priv_data;
++    int64_t pts;
+
+     uint16_t rect;
+
+@@ -386,7 +388,10 @@ static int display_end_segment(AVCodecContext *avctx, void *data,
+      *      not been cleared by a subsequent empty display command.
+      */
+
++    pts = ctx->pts != AV_NOPTS_VALUE ? ctx->pts : sub->pts;
+     memset(sub, 0, sizeof(*sub));
++    sub->pts = pts;
++    ctx->pts = AV_NOPTS_VALUE;
+
+     // Blank if last object_count was 0.
+     if (!ctx->presentation.object_count)
+@@ -431,8 +436,10 @@ static int display_end_segment(AVCodecContext *avctx, void *data,
+ static int decode(AVCodecContext *avctx, void *data, int *data_size,
+                   AVPacket *avpkt)
+ {
++    PGSSubContext *ctx = avctx->priv_data;
+     const uint8_t *buf = avpkt->data;
+     int buf_size       = avpkt->size;
++    AVSubtitle *sub    = data;
+
+     const uint8_t *buf_end;
+     uint8_t       segment_type;
+@@ -477,6 +484,7 @@ static int decode(AVCodecContext *avctx, void *data, int *data_size,
+             break;
+         case PRESENTATION_SEGMENT:
+             parse_presentation_segment(avctx, buf, segment_length);
++            ctx->pts = sub->pts;
+             break;
+         case WINDOW_SEGMENT:
+             /*
+diff --git a/lib/ffmpeg/libavcodec/utils.c b/lib/ffmpeg/libavcodec/utils.c
+index 99bf27c..c1cde2c 100644
+--- a/lib/ffmpeg/libavcodec/utils.c
++++ b/lib/ffmpeg/libavcodec/utils.c
+@@ -1396,6 +1396,9 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
+     avctx->pkt = avpkt;
+     *got_sub_ptr = 0;
+     avcodec_get_subtitle_defaults(sub);
++    if (avctx->time_base.den && avpkt->pts != AV_NOPTS_VALUE)
++        sub->pts = av_rescale_q(avpkt->pts,
++                                avctx->time_base, AV_TIME_BASE_Q);
+     ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
+     if (*got_sub_ptr)
+         avctx->frame_number++;