VLC Raspberry Pi 4如何通过命令行将音频发送到HDMI 2？
我正在使用两个HDMI端口的Raspberry Pi 4上运行Rasbian OS，并且通过终端，我可以使用sudo cvlc-assa-audio-device default video.mp4 现在我面临的问题是在带有音频的HDMI 2上运行第二个视频，我可以使用此命令display =：0 cvlc -qt-fullscreen-screennumber = 1 -alsa-audio来运行视频。 -Device HW：1,0 Video.mp4，但我似乎无法在HDMI 2上使用音频。
我使用aplay -L检查了我的音频输出，这给了我以下内容输出。
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 3/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 1: b2 [bcm2835 HDMI 2], device 0: bcm2835 HDMI 2 [bcm2835 HDMI 2]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
card 2: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
问题是我不确定如何在上解决声音card 1 -Alsa-audio-device
I'm running Rasbian OS on a raspberry pi 4 with two HDMI ports and via terminal, I can run a video with audio working on HDMI 1 using sudo cvlc --alsa-audio-device default video.mp4 now the problem I'm facing is running a second video on HDMI 2 with audio, I can get the video running using this command DISPLAY=:0 cvlc --qt-fullscreen-screennumber=1 --alsa-audio-device hw:1,0 video.mp4 but I can't seem to get the audio working on HDMI 2.
I checked my audio outputs using aplay -l which gave me the following output.
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 3/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 1: b2 [bcm2835 HDMI 2], device 0: bcm2835 HDMI 2 [bcm2835 HDMI 2]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
card 2: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
The problem is I'm not really sure how to address the sound card 1 on --alsa-audio-device
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您的问题是PI将它们视为HDMI 0和HDMI 1，因此HDMI 0是acct的1，而HDMI 1是2。您可以在PI上的端口上的标签上看到这一点。
Your problem is that the pi thinks of them as hdmi 0 and hdmi 1, so hdmi 0 is acctually 1, and hdmi 1 is 2. You can see this on the labelling on the ports on the pi
这解决了我的问题，我现在可以通过命令行选择特定的硬件输出来单独发送到每个HDMI。
HDMI1
HDMI 2
This solved my problem, I can now send audio individually to each HDMI by selecting the specific hardware output via command line.
HDMI1
HDMI 2