Не показывается битрейт аудио после кодирования из pcm в flac из видео через FFmpeg, как отобразить битрейт аудио?

Question

[Baker_33]

Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn
Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_amf))
Stream #0:1 -> #0:1 (pcm_bluray (native) -> flac (native))
Press [q] to stop, [?] for help
Output #0, matroska, to '00001.mkv':
Metadata:
encoder : Lavf61.3.103
Stream #0:0: Video: hevc, yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 18000 kb/s, 59.94 fps, 1k tbn
Metadata:
encoder : Lavc61.5.104 hevc_amf
Stream #0:1: Audio: flac ([172][241][0][0] / 0xF1AC), 48000 Hz, stereo, s32 (24 bit), 128 kb/s - ПОЧЕМУ ПОКАЗЫВАЕТ 128 kb/s???
Metadata:
encoder : Lavc61.5.104 flac

Использовал эту команду для двухпроходного видео:
1 этап: ffmpeg -y -i C:\input\00001.m2ts -vf yadif=1 -c:v hevc_amf -b:v 18000K -maxrate 36000K -bufsize 36000K -quality quality -pass 1 -an -f null NUL
2 этап: ffmpeg -i 00001.m2ts -vf yadif=1 -c:v hevc_amf -b:v 18000K -maxrate 36000K -bufsize 36000K -quality quality -c:a flac -pass 2 00001.mkv

FFmpeg Audio info(flac):
Stream #0:1: Audio: flac, 48000 Hz, stereo, s32 (24 bit)
Metadata:
ENCODER : Lavc61.5.104 flac
DURATION : 01:30:37.435000000
FFmpeg Audio info(pcm):
Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s

Mediainfo(flac):
Audio
ID : 2
Format : FLAC
Format/Info : Free Lossless Audio Codec
Codec ID : A_FLAC
Duration : 1 h 30 min
Bit rate mode : Variable
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Bit depth : 24 bits
Compression mode : Lossless
Writing library : Lavc61.5.104 flac
Default : No
Forced : No
MD5 of the unencoded content : EBA90DCA5F9642962B3EBA7116FAE03D

Mediainfo(pcm):
Audio
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : PCM
Format settings : Big / Signed
Muxing mode : Blu-ray
Codec ID : 128
Duration : 1 h 30 min
Bit rate mode : Constant
Bit rate : 2 304 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Bit depth : 24 bits
Stream size : 1.46 GiB (5%)