我正在尝试将4k Sony Handycam的直接视频输出直接通过HDMI转换为Blackmagic Intensity Pro 4K。我可以验证相机，Hdmi和blackmagic卡正在工作，因为我可以使用提供的＆＃34; Media Express＆＃34;捕捉和观看视频。程序。当使用ffmpeg我得到视频输出但我也得到缓冲区溢出。
这是命令：
time ffmpeg -f decklink -i "Intensity Pro 4K@20" -c:v nvenc -b:v 100M -vf yadif=0:-1:0" -pix_fmt yuv420p -crf 29.97 -strict -2 output.mp4
我得到以下输出：
ffmpeg version N-76538-gb83c849 Copyright (c) 2000-2015 the FFmpeg
developers built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --enable-nonfree --enable-nvenc --enable-nvresize --extra-cflags=-I../cudautils --extra-ldflags=-L../cudautils --enable-gpl --enable-libx264 --enable-libx265 --enable-decklink --extra-cflags=-I/home/tristan/Downloads/BlackmagicDeckLinkSDK10.6.5/Linux/include --extra-ldflags=-L/home/tristan/Downloads/BlackmagicDeckLinkSDK10.6.5/Linux/include
libavutil 55. 5.100 / 55. 5.100
libavcodec 57. 15.100 / 57. 15.100
libavformat 57. 14.100 / 57. 14.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 15.100 / 6. 15.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
[decklink @ 0x1ccd6e0] Found Decklink mode 3840 x 2160 with rate 29.97
[decklink @ 0x1ccd6e0] Stream #1: not enough frames to estimate rate; consider increasing probesize
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, decklink, from 'Intensity Pro 4K@20':
Duration: N/A, start: 0.000000, bitrate: 1536 kb/s
Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
Stream #0:1: Video: rawvideo (UYVY / 0x59565955), uyvy422, 3840x2160, -5 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 (output.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
File 'output.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'output.mp4':
Metadata:
encoder : Lavf57.14.100
Stream #0:0: Video: h264 (nvenc) ([33][0][0][0] / 0x0021), yuv420p, 3840x2160, q=-1--1, 100000 kb/s, 29.97 fps, 30k tbn, 29.97 tbc
Metadata:
encoder : Lavc57.15.100 nvenc
Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc57.15.100 aac
Stream mapping:
Stream #0:1 -> #0:0 (rawvideo (native) -> h264 (nvenc))
Stream #0:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[decklink @ 0x1ccd6e0] Decklink input buffer overrun!:03.15 bitrate=70411.7kbits/s
Last message repeated 1 times
[decklink @ 0x1ccd6e0] Decklink input buffer overrun!:03.54 bitrate=73110.9kbits/s
Last message repeated 20 times
[decklink @ 0x1ccd6e0] Decklink input buffer overrun!:03.92 bitrate=76270.2kbits/s
Last message repeated 15 times
[decklink @ 0x1ccd6e0] Decklink input buffer overrun!:04.28 bitrate=78367.6kbits/s
Last message repeated 61 times
frame= 140 fps= 22 q=-0.0 Lsize= 57266kB time=00:00:04.67 bitrate=100425.2kbits/s
video:57187kB audio:72kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.009844%
[decklink @ 0x1ccd6e0] Decklink input buffer overrun!
Last message repeated 7 times
[aac @ 0x1cd7020] Qavg: 215.556
real 0m8.808s
user 0m5.785s
sys 0m1.749s
对此有一些了解，只是一些可能解决问题的命令，或者其他。