Ffmpeg命令在Ubuntu Linux中捕获来自Decklink 4k Extreme的视频

Question

我正在尝试使用ffmpeg从Ubuntu Linux中的Blackmagic DeckLink 4K Extreme采集卡的HDMI输入端口捕获视频。

根据ffmpeg Documentation，我尝试了以下内容：

ffmpeg -f decklink -video_input 'hdmi' -i 'DeckLink 4K Extreme (1)@14' -acodec copy -vcodec copy ~/testCapture/card1_f14_hdmi.avi

但无论我做什么，我总是将这张照片视为视频

我的ffmpeg版本是：

ffmpeg version git-2016-08-15-4899953 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static 
--extra-cflags=-I/root/ffmpeg_build/include 
--extra-ldflags=-L/root/ffmpeg_build/lib 
--bindir=/root/bin --enable-gpl --enable-libass --enable-libfdk-aac 
--enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora 
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 
--enable-decklink 
--extra-cflags=-I/root/decklinkSDK/Blackmagic_DeckLink_SDK/Linux/include
--extra-ldflags=-L/root/decklinkSDK/Blackmagic_DeckLink_SDK/Linux/include
--enable-nonfree
libavutil      55. 28.100 / 55. 28.100
libavcodec     57. 51.102 / 57. 51.102
libavformat    57. 46.101 / 57. 46.101
libavdevice    57.  0.102 / 57.  0.102
libavfilter     6. 51.100 /  6. 51.100
libswscale      4.  1.100 /  4.  1.100
libswresample   2.  1.100 /  2.  1.100
libpostproc    54.  0.100 / 54.  0.100

我有两张这样的卡片如下：

ffmpeg -f decklink -list_devices 1 -i dummy
.....
[decklink @ 0x2e9e440] Blackmagic DeckLink devices:
[decklink @ 0x2e9e440]    'DeckLink 4K Extreme (1)'
[decklink @ 0x2e9e440]    'DeckLink 4K Extreme (2)'

我可以通过以下方式获得支持的格式列表：

ffmpeg -f decklink -list_formats 1 -i 'DeckLink 4K Extreme (1)'
...
[decklink @ 0x36e2440] Supported formats for 'DeckLink 4K Extreme (1)':
[decklink @ 0x36e2440]    1   720x486 at 30000/1001 fps (interlaced, lower field first)
[decklink @ 0x36e2440]    2   720x576 at 25000/1000 fps (interlaced, upper field first)
[decklink @ 0x36e2440]    3   1920x1080 at 24000/1001 fps
[decklink @ 0x36e2440]    4   1920x1080 at 24000/1000 fps
[decklink @ 0x36e2440]    5   1920x1080 at 25000/1000 fps
[decklink @ 0x36e2440]    6   1920x1080 at 30000/1001 fps
[decklink @ 0x36e2440]    7   1920x1080 at 30000/1000 fps
[decklink @ 0x36e2440]    8   1920x1080 at 25000/1000 fps (interlaced, upper field first)
[decklink @ 0x36e2440]    9   1920x1080 at 30000/1001 fps (interlaced, upper field first)
[decklink @ 0x36e2440]    10  1920x1080 at 30000/1000 fps (interlaced, upper field first)
[decklink @ 0x36e2440]    11  1920x1080 at 50000/1000 fps
[decklink @ 0x36e2440]    12  1920x1080 at 60000/1001 fps
[decklink @ 0x36e2440]    13  1920x1080 at 60000/1000 fps
[decklink @ 0x36e2440]    14  1280x720 at 50000/1000 fps
[decklink @ 0x36e2440]    15  1280x720 at 60000/1001 fps
[decklink @ 0x36e2440]    16  1280x720 at 60000/1000 fps
...
DeckLink 4K Extreme (1): Immediate exit requested

我应该使用ffmpeg来捕获带有HDMI端口声音的高清视频？

Answer 1

＆＃34;当ffmpeg中设置的参数选择的分辨率/扫描速率与输入不匹配时，将显示条形图。您目前将其设置为1280x720 @ 50p＆＃34;

来自https://forum.blackmagicdesign.com/viewtopic.php?f=12&t=50941

条形码在卡内部生成。所以我的猜测是确认你的HDMI实际上正在传输720p50。也就是说，＆＃34; DeckLink Quad 2＆＃34;支持更多格式，我也得到了条形码。

https://forum.blackmagicdesign.com/viewtopic.php?f=3&t=9654

使用来自https://github.com/lu-zero/bmdtools的工具调用bmdcapture，可用于补充FFMPEG或libav。