1
我想使用C525网络摄像头和BeagleBone黑色板（运行Debian）来传输H.264编码的视频。无法通过BeagleBone Black在VLC上传输Logitech C525的H.264视频？
这是我的命令：
cvlc -vvv v4l2:///dev/video0:width=1280:height=720:fps=30 --sout '#transcode{vcodec=H264,vb=2000,acodec=none}:rtp{dst=IP_ADDRESS,port=8004,mux=ts}'
它在我的电脑上工作，但它不会对我的BeagleBone船上工作。
以下是2例的日志输出。在我的电脑：
......
[0x7ff9a0000be8] main input debug: `v4l2:///dev/video0:width=1280:height=720:fps=30' successfully opened
[0x7ff9a0000be8] main input debug: Buffering 0%
[0x7ff9a0000be8] main input debug: switching to sync mode
[0x7ff99c000bd8] main stream output debug: adding a new sout input (sout_input:0x7ff9940008c0)
[0x7ff99c0084d8] stream_out_transcode stream out debug: creating video transcoding from fcc=`YUY2' to fcc=`H264'
[0x7ff9940009c8] main generic debug: looking for decoder module matching "any": 39 candidates
[0x7ff9940009c8] main generic debug: using decoder module "rawvideo"
[0x7ff994000e18] main encoder debug: looking for encoder module matching "any": 17 candidates
[0x7ff9a0000be8] main input debug: Buffering 33%
[libx264 @ 0x7ff99401c140] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x7ff99401c140] profile High, level 3.1
[libx264 @ 0x7ff99401c140] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1,00:0,00 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=8 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2000 ratetol=1,0 qcomp=0,50 qpmin=3 qpmax=51 qpstep=3 ip_ratio=1,25 aq=1:1,00
[0x7ff994000e18] avcodec encoder debug: found encoder H264 - MPEG-4 AVC (part 10)
[0x7ff994000e18] main encoder debug: using encoder module "avcodec"
[0x7ff994000e18] main encoder debug: removing module "avcodec"
[libx264 @ 0x7ff99401c140] final ratefactor: 21,01
[0x7ff9a0000be8] main input debug: Buffering 66%
[0x7ff9a0000be8] main input debug: Stream buffering done (301 ms in 298 ms)
[0x7ff9a0000be8] main input debug: Decoder buffering done in 0 ms
[0x7ff99c0084d8] stream_out_transcode stream out debug: decoder aspect is 1.777778:1
[0x7ff99c0084d8] stream_out_transcode stream out debug: source pixel aspect is 1.000000:1
[0x7ff99c0084d8] stream_out_transcode stream out debug: scaled pixel aspect is 1.000000:1
[0x7ff99c0084d8] stream_out_transcode stream out debug: source 1280x720, destination 1280x720
[0x7ff99c0084d8] stream_out_transcode stream out debug: encoder aspect is 1280:720
[0x7ff99401c1d8] main filter debug: looking for video filter2 module matching "any": 55 candidates
[0x7ff99401c1d8] swscale filter debug: 1280x720 chroma: YUY2 -> 1280x720 chroma: I420 with scaling using Bicubic (good quality)
[0x7ff99401c1d8] main filter debug: using video filter2 module "swscale"
[0x7ff99c0084d8] main stream out debug: Filter 'Swscale' (0x7ff99401c1d8) appended to chain
[0x7ff99c0084d8] stream_out_transcode stream out debug: destination (after video filters) 1280x720
[0x7ff994000e18] main encoder debug: looking for encoder module matching "any": 17 candidates
[libx264 @ 0x7ff994022fc0] using SAR=1/1
[libx264 @ 0x7ff994022fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x7ff994022fc0] profile High, level 3.1
[libx264 @ 0x7ff994022fc0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1,00:0,00 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=8 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2000 ratetol=1,0 qcomp=0,50 qpmin=3 qpmax=51 qpstep=3 ip_ratio=1,25 aq=1:1,00
[0x7ff994000e18] avcodec encoder debug: found encoder H264 - MPEG-4 AVC (part 10)
[0x7ff994000e18] main encoder debug: using encoder module "avcodec"
[0x7ff99c003fc8] main mux debug: adding a new input
[0x7ff99c003fc8] mux_ts mux debug: adding input codec=h264 pid=68
[0x7ff99c003fc8] mux_ts mux debug: new PCR PID is 68
在BeagleBone：
......
[0xb51005f8] main input debug: `v4l2:///dev/video0:width=1280:height=720:fps=30' successfully opened
我觉得BeagleBone缺少视频编码器，因此它不能转码视频，H264，但是日志不显示任何有关它的信息。你有什么建议吗？