avfilter/vf_framepack: Check and update frame_rate

The frame_rate update was missing leaving the output frame rate
wrong.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit a46a23d3)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_framepack.c

@@ -82,6 +82,7 @@ static int config_output(AVFilterLink *outlink)
     int width            = ctx->inputs[LEFT]->w;
     int height           = ctx->inputs[LEFT]->h;
     AVRational time_base = ctx->inputs[LEFT]->time_base;
+    AVRational frame_rate = ctx->inputs[LEFT]->frame_rate;
 
     // check size and fps match on the other input
     if (width  != ctx->inputs[RIGHT]->w ||
@@ -93,11 +94,18 @@ static int config_output(AVFilterLink *outlink)
         return AVERROR_INVALIDDATA;
     } else if (av_cmp_q(time_base, ctx->inputs[RIGHT]->time_base) != 0) {
         av_log(ctx, AV_LOG_ERROR,
-               "Left and right framerates differ (%d/%d vs %d/%d).\n",
+               "Left and right time bases differ (%d/%d vs %d/%d).\n",
                time_base.num, time_base.den,
                ctx->inputs[RIGHT]->time_base.num,
                ctx->inputs[RIGHT]->time_base.den);
         return AVERROR_INVALIDDATA;
+    } else if (av_cmp_q(frame_rate, ctx->inputs[RIGHT]->frame_rate) != 0) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Left and right framerates differ (%d/%d vs %d/%d).\n",
+               frame_rate.num, frame_rate.den,
+               ctx->inputs[RIGHT]->frame_rate.num,
+               ctx->inputs[RIGHT]->frame_rate.den);
+        return AVERROR_INVALIDDATA;
     }
 
     s->pix_desc = av_pix_fmt_desc_get(outlink->format);
@@ -108,6 +116,8 @@ static int config_output(AVFilterLink *outlink)
     switch (s->format) {
     case AV_STEREO3D_FRAMESEQUENCE:
         time_base.den *= 2;
+        frame_rate.num *= 2;
+
         s->double_pts = AV_NOPTS_VALUE;
         break;
     case AV_STEREO3D_COLUMNS:
@@ -126,6 +136,7 @@ static int config_output(AVFilterLink *outlink)
     outlink->w         = width;
     outlink->h         = height;
     outlink->time_base = time_base;
+    outlink->frame_rate= frame_rate;
 
     return 0;
 }

tests/ref/fate/filter-framepack-frameseq

-#tb 0: 1/25
+#tb 0: 1/50
 0,          0,          0,        1,   152064, 0x05b789ef
 0,          1,          1,        1,   152064, 0x05b789ef
 0,          2,          2,        1,   152064, 0x4bb46551
-0,          3,          3,        1,   152064, 0x9dddf64a
-0,          4,          4,        1,   152064, 0x2a8380b0
-0,          5,          5,        1,   152064, 0x4de3b652
-0,          6,          6,        1,   152064, 0xedb5a8e6
-0,          7,          7,        1,   152064, 0xe20f7c23
-0,          8,          8,        1,   152064, 0x5ab58bac
-0,          9,          9,        1,   152064, 0x1f1b8026
-0,         10,         10,        1,   152064, 0x91373915
-0,         11,         11,        1,   152064, 0x02344760
-0,         12,         12,        1,   152064, 0x30f5fcd5
-0,         13,         13,        1,   152064, 0xc711ad61
-0,         14,         14,        1,   152064, 0x24eca223
+0,          3,          3,        1,   152064, 0x4bb46551
+0,          4,          4,        1,   152064, 0x9dddf64a
+0,          5,          5,        1,   152064, 0x9dddf64a
+0,          6,          6,        1,   152064, 0x2a8380b0
+0,          7,          7,        1,   152064, 0x2a8380b0
+0,          8,          8,        1,   152064, 0x4de3b652
+0,          9,          9,        1,   152064, 0x4de3b652
+0,         10,         10,        1,   152064, 0xedb5a8e6
+0,         11,         11,        1,   152064, 0xedb5a8e6
+0,         12,         12,        1,   152064, 0xe20f7c23
+0,         13,         13,        1,   152064, 0xe20f7c23
+0,         14,         14,        1,   152064, 0x5ab58bac