[x265] Videos encoded with x265 have wrong framerate

[Niccolò Belli]

Hi,
I encode my videos with

ffmpeg -v 0 -i ~/PlanetEarthBirds.mkv -threads 4 -vsync 0 -an -pix_fmt yuv420p 
-f yuv4mpegpipe - | ./x265 - --y4m --preset placebo --crf 28 -o prova.h265

The source is 23.98 fps but the encoded video shows 25 fps instead:

Stream #0:0: Video: hevc (Main), yuv420p(tv), 1920x1080, 25 fps, 25 tbr, 1200k 
tbn, 25 tbc

VIDEO:  [HEVC]  1920x1080  0bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)

If I encode the same video in the same way using x264 it works flawlessly:

Stream #0:0: Video: h264 (Constrained Baseline), yuv420p, 1920x1080 [SAR 1:1 
DAR 16:9], 23.98 fps, 23.98 tbr, 1200k tbn, 47.95 tbc

VIDEO:  [H264]  1920x1080  0bpp  23.976 fps    0.0 kbps ( 0.0 kbyte/s)

Encoding with --fps 23.976 does not help.

Niccolò
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