如何使用 pactl 更改左右音量级别

我从系统声音中录制的任何内容的输出都使用portaudioorparec的音量非常低。

从这个答案中-49dB看到的最大音量。ffmpeg -i video.avi -af "volumedetect" -vn -sn -dn -f null /dev/null

我发现问题是这样的

这是的输出

pactl list sources

Source #0
    State: SUSPENDED
    Name: alsa_output.pci-0000_00_1f.3.analog-stereo.monitor
    Description: Monitor of Built-in Audio Analog Stereo
    Driver: module-alsa-card.c
    Sample Specification: s16le 2ch 48000Hz
    Channel Map: front-left,front-right
    Owner Module: 6
    Mute: no
    Volume: front-left: 9995 /  15% / -49.00 dB,   front-right: 9995 /  15% / -49.00 dB
            balance 0.00
    Base Volume: 65536 / 100% / 0.00 dB
    Monitor of Sink: alsa_output.pci-0000_00_1f.3.analog-stereo
    Latency: 0 usec, configured 0 usec
    Flags: DECIBEL_VOLUME LATENCY 
    Properties:
        device.description = "Monitor of Built-in Audio Analog Stereo"
        device.class = "monitor"
        alsa.card = "0"
        alsa.card_name = "HDA Intel PCH"
        alsa.long_card_name = "HDA Intel PCH at 0xd52b0000 irq 132"
        alsa.driver_name = "snd_hda_intel"
        device.bus_path = "pci-0000:00:1f.3"
        sysfs.path = "/devices/pci0000:00/0000:00:1f.3/sound/card0"
        device.bus = "pci"
        device.vendor.id = "8086"
        device.vendor.name = "Intel Corporation"
        device.product.id = "9d71"
        device.form_factor = "internal"
        device.string = "0"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card-pci"
    Formats:
        pcm

...

正如你所看到front-left: 9995 / 15% / -49.00 dB, front-right: 9995 / 15% / -49.00 dB的，我需要它们都被100%我尝试过pactl set-sink-vloume 0 100%，但它什么也没做。

我也试过https://askubuntu.com/a/1206159/971923。

将左右都更改为 a 的命令是100%什么？

我也没有看到那些alsamixer。

使用 Ubuntu 20.04

我相信操作系统与这个问题无关（我要求一个特定于 pactl 或相关软件（如 alsamixer）的命令）。