先眼下将一个sn9c291+ov9712的模块驱动在fedora上载入成功，但是在使用mplayer却无法播放，不知道为何？
前后对照发现dev文件夹下多了video0。video1 设备节点已经出来，video1 是H264的节点
[root@localhost mplayer]# mplayer tv:// -tv driver=v4l2:width=1280:height=720:device=/dev/video1:outfmt=0x34363248 -fps 24
MPlayer SVN-r37243-4.4.4 (C) 2000-2014 MPlayer Team Playing tv://. TV file format detected. Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski@zpr.uni-koeln.de> comment: first try, more to come ;-) v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead. Selected device: USB 2.0 Camera Capabilities: video capture streaming supported norms: inputs: 0 = Camera 1; Current input: 0 Current format: YUYV ================================================================== WARNING: UNTESTED OR UNKNOWN OUTPUT IMAGE FORMAT REQUESTED (0x34363248) This may cause buggy playback or program crash! Bug reports will be ignored! You should try again with YV12 (which is the default colorspace) and read the documentation! ================================================================== v4l2: ioctl set format failed: Invalid argument tv.c: norm_from_string(pal): Bogus norm parameter, setting default. v4l2: ioctl enum norm failed: Invalid argument Error: Cannot set norm! Selected input hasn't got a tuner! v4l2: ioctl set mute failed: Invalid argument v4l2: ioctl streamon failed: No space left on device [VO_XV] It seems there is no Xvideo support for your video card available. [VO_XV] Run 'xvinfo' to verify its Xv support and read [VO_XV] DOCS/HTML/en/video.html#xv! [VO_XV] See 'mplayer -vo help' for other (non-xv) video out drivers. [VO_XV] Try -vo x11. OpenGL Warning: Failed to connect to host. Make sure 3D acceleration is enabled for this VM. ========================================================================== Opening video decoder: [raw] RAW Uncompressed Video Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] Movie-Aspect is undefined - no prescaling applied. [swscaler @ 0xb97a3a00] bicubic scaler, from yuyv422 to bgra using MMXEXT VO: [x11] 640x480 => 640x480 BGRA Selected video codec: [rawyuy2] vfm: raw (RAW YUY2) ========================================================================== Audio: no sound Starting playback... [swscaler @ 0xb97a3a00] Warning: data is not aligned! This can lead to a speedloss V: 0.0 31/ 31 ??% ??% ??
,?
% 0 0
MPlayer interrupted by signal 11 in module: video_read_frame - MPlayer crashed by bad usage of CPU/FPU/RAM. Recompile MPlayer with --enable-debug and make a 'gdb' backtrace and disassembly. Details in DOCS/HTML/en/bugreports_what.html#bugreports_crash. - MPlayer crashed. This shouldn't happen. It can be a bug in the MPlayer code _or_ in your drivers _or_ in your gcc version. If you think it's MPlayer's fault, please read DOCS/HTML/en/bugreports.html and follow the instructions there. We can't and won't help unless you provide this information when reporting a possible bug. [root@localhost mplayer]# mplayer tv:// -tv driver=v4l2:width=1280:height=720:device=/dev/video1:outfmt=0x34363248 MPlayer SVN-r37243-4.4.4 (C) 2000-2014 MPlayer Team Playing tv://. TV file format detected. Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski@zpr.uni-koeln.de> comment: first try, more to come ;-) v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead. Selected device: USB 2.0 Camera Capabilities: video capture streaming supported norms: inputs: 0 = Camera 1; Current input: 0 Current format: unknown (0x34363248) ================================================================== WARNING: UNTESTED OR UNKNOWN OUTPUT IMAGE FORMAT REQUESTED (0x34363248) This may cause buggy playback or program crash! Bug reports will be ignored! You should try again with YV12 (which is the default colorspace) and read the documentation! ================================================================== tv.c: norm_from_string(pal): Bogus norm parameter, setting default. v4l2: ioctl enum norm failed: Invalid argument Error: Cannot set norm! Selected input hasn't got a tuner! v4l2: ioctl set mute failed: Invalid argument v4l2: ioctl streamon failed: No space left on device [VO_XV] It seems there is no Xvideo support for your video card available. [VO_XV] Run 'xvinfo' to verify its Xv support and read [VO_XV] DOCS/HTML/en/video.html#xv! [VO_XV] See 'mplayer -vo help' for other (non-xv) video out drivers. [VO_XV] Try -vo x11. OpenGL Warning: Failed to connect to host. Make sure 3D acceleration is enabled for this VM. ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family libavcodec version 55.71.100 (internal) Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) ========================================================================== Audio: no sound Starting playback... [h264 @ 0xb76089a0]no frame! Error while decoding frame! [h264 @ 0xb76089a0]no frame! Error while decoding frame! [h264 @ 0xb76089a0]no frame! Error while decoding frame! [h264 @ 0xb76089a0]no frame! Error while decoding frame! [h264 @ 0xb76089a0]no frame! Error while decoding frame! [h264 @ 0xb76089a0]no frame!