我有 HDMI 转 S-Video 转换器：适用于 PC 笔记本电脑的迷你便携式 USB 2.0 端口高清 1 路 HDMI 1080P 视频采集卡。
因此它有：
HDMI 输入（连接到计算机，因此我愿意从中录制视频输出）
USB 输出（连接到
mencoder正在运行的基于 Debian 的 Linux 发行版 -Linux raspberrypi 4.14.50-v7+ #1122 SMP Tue Jun 19 12:26:26 BST 2018 armv7l GNU/Linux）
/dev/video0插入 USB 后我就能看到设备。
这是dmesg设备连接时的输出：
[ 2132.394435] usb 1-1.3: new high-speed USB device number 7 using dwc2
[ 2132.527882] usb 1-1.3: config 1 interface 0 altsetting 1 bulk endpoint 0x83 has invalid maxpacket 256
[ 2132.530876] usb 1-1.3: New USB device found, idVendor=1b71, idProduct=3002
[ 2132.530898] usb 1-1.3: New USB device strings: Mfr=3, Product=4, SerialNumber=2
[ 2132.530906] usb 1-1.3: Product: usbtv007
[ 2132.530915] usb 1-1.3: Manufacturer: fushicai
[ 2132.530923] usb 1-1.3: SerialNumber: 300000000002
[ 2132.532973] usbtv 1-1.3:1.0: Fushicai USBTV007 Audio-Video Grabber
问题：
正常情况下应该是这样的：
这是 mencoder 命令：
pi@raspberrypi:/tmp $ mencoder tv:// -tv driver=v4l2:norm=NTSC:device=/dev/video0:input=1:fps=5 -nosound -ovc copy -o test.avi
MEncoder 1.3.0 (Debian), built with gcc-6.2.1 (C) 2000-2016 MPlayer Team
success: format: 9 data: 0x0 - 0x0
TV file format detected.
Selected driver: v4l2
name: Video 4 Linux 2 input
author: Martin Olschewski <[email protected]>
comment: first try, more to come ;-)
Selected device: usbtv
Capabilities: video capture read/write streaming
supported norms: 0 = NTSC; 1 = NTSC-M; 2 = NTSC-M-JP; 3 = NTSC-M-KR; 4 = NTSC-443; 5 = PAL; 6 = PAL-BG; 7 = PAL-H; 8 = PAL-I; 9 = PAL-DK; 10 = PAL-M; 11 = PAL-60;
inputs: 0 = Composite; 1 = S-Video;
Current input: 1
Current format: YUYV
Selected input hasn't got a tuner!
v4l2: ioctl set mute failed: Invalid argument
[V] filefmt:9 fourcc:0x32595559 size:720x480 fps:5.000 ftime:=0.2000
videocodec: framecopy (720x480 24bpp fourcc=32595559)
Forcing audio preload to 0, max pts correction to 0.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos: 0.0s 1f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
Skipping frame!
Pos: 0.2s 2f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
Skipping frame!
Pos: 0.2s 3f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0]
Invalid frame duration value (0.120/0.000 => -0.120). Defaulting to 0.040 sec.
Skipping frame!
Pos: 0.2s 4f ( 0%) 3.96fps Trem: 0min 0mb A-V:0.000 [0:0]
v4l2: select timeout
some repeated and not relevant output removed
48 duplicate frame(s)!
Pos: 69.0s 38f ( 0%) 3.73fps Trem: 0min 0mb A-V:0.000 [1602:0]
Skipping frame!
Pos: 69.2s 39f ( 0%) 3.81fps Trem: 0min 0mb A-V:0.000 [1598:0]
Skipping frame!
Pos: 69.2s 40f ( 0%) 3.89fps Trem: 0min 0mb A-V:0.000 [1598:0]
Invalid frame duration value (9.918/0.000 => -9.918). Defaulting to 0.040 sec.
Skipping frame!
^Cs: 69.2s 41f ( 0%) 3.80fps Trem: 0min 0mb A-V:0.000 [1598:0]
v4l2: select timeout
Skipping frame!
Pos: 69.2s 42f ( 0%) 3.71fps Trem: 0min 0mb A-V:0.000 [1598:0]
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Video stream: 1598.150 kbit/s (199768 B/s) size: 13824000 bytes 69.200 secs 42 frames
v4l2: ioctl set mute failed: Invalid argument
v4l2: 26 frames successfully processed, 31 frames dropped.
pi@raspberrypi:/tmp $
mencoder 版本：
MEncoder 1.3.0 (Debian), built with gcc-6.2.1 (C) 2000-2016 MPlayer Team
HDMI 转换器似乎可以正常工作，但不知为何出现了绿线（产生了故障），导致输出几乎不可见。我尝试了两种不同的 HDMI 转 S-Video 转换器、两种不同的 HDMI 电缆和两台不同的计算机来进行 HDMI 输出 - 结果完全相同。您认为问题可能出在哪里？谢谢
答案1
就我而言，删除 dwc2 模块/boot/config.txt即可/boot/cmdline.txt解决问题。