[问答]

AN75779无法查询UVC控件

问答对人有帮助，内容完整，我也想知道答案 0 我正试图建立一个基于AN7799的系统来工作。我在Linux下运行（内核4.12.5）。当我奔跑 V4L2GAP-MQ 100 D/DEV/VIDO0/O/TMP/GAPP.JPG 当运行V4L2GRAP时，得到以下输出通过设备/DEV/VIDO0将图像宽度设置为1280。图像高度由设备/DEV/VIDO0设置为720。然后它就挂了。在我的FX3控制台上，我观察到当启动V4L2GRAPH时激活了流 UVC：完成0帧和0缓冲器 UVC：完成0帧和0缓冲器 UVC：完成0帧和0缓冲器 UVC：完成21帧和3缓冲器 UVC：完成42帧和19缓冲器 UVC：完成63帧和35缓冲器 UVC：完成84帧和51缓冲器 UVC：完成106帧和9缓冲器然而，在Linux主机内核日志中，我观察到： [7446.534814 ] UVCVID:找到UVC 1设备FX3（04B4:00 F9） [7446.536477 ] UVCVIEW 2-6:1.0：实体扩展3的实体类型未初始化！ [ 7446.536482 ] uvcvideo 2-6:1.0：实体处理2个实体类型没有被初始化！ [ 7446.536485 ] uvcvideo 2-6:1.0：实体相机1实体类型没有被初始化！【7446.536654】输入：FX3 /设备/ pci0000:00 / 0000:00:14.0 / USB2 / 2-6 / 2-6: 1.0/input/input13 [ 8488.136849 ] uvcvideo：无法查询（get_def）UVC控制2单元2：1（预期值2）。什么是错误“无法查询（get_def）引起的UVC控制”？ V4L2Grand工作良好，如果插入一个普通的USB网络摄像头。以上来自于百度翻译以下为原文 I'm trying to get a system based upon AN75779 to work. I'm running under Linux (kernel 4.12.5). When I run v4l2grab -m -q 100 -d /dev/video0 -o /tmp/grab.jpg When I run v4l2grab I get the following output Image width set to 1280 by device /dev/video0. Image height set to 720 by device /dev/video0. and then it just hangs. On my FX3 console I observe that streaming is activated when I start v4l2grab UVC: Completed 0 frames and 0 buffers UVC: Completed 0 frames and 0 buffers UVC: Completed 0 frames and 0 buffers UVC: Completed 21 frames and 3 buffers UVC: Completed 42 frames and 19 buffers UVC: Completed 63 frames and 35 buffers UVC: Completed 84 frames and 51 buffers UVC: Completed 106 frames and 9 buffers However, in the Linux host kernel log I observe: [ 7446.534814] uvcvideo: Found UVC 1.00 device FX3 (04b4:00f9) [ 7446.536477] uvcvideo 2-6:1.0: Entity type for entity Extension 3 was not initialized! [ 7446.536482] uvcvideo 2-6:1.0: Entity type for entity Processing 2 was not initialized! [ 7446.536485] uvcvideo 2-6:1.0: Entity type for entity Camera 1 was not initialized! [ 7446.536654] input: FX3 as /devices/pci0000:00/0000:00:14.0/u***2/2-6/2-6:1.0/input/input13 [ 8488.136849] uvcvideo: Failed to query (GET_DEF) UVC control 2 on unit 2: 1 (exp. 2). What is the error "Failed to query (GET_DEF) UVC control" caused by? v4l2grab works fine if plug in a plain USB web camera. 0
2019-1-7 14:36:23　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × 36切53 该类别下有 65 个回答。邀请回答 hnui2002 该类别下有 50 个回答。邀请回答细水爱长流该类别下有 33 个回答。邀请回答不cdvdhgdh 该类别下有 31 个回答。邀请回答 iwuwjgj 该类别下有 26 个回答。邀请回答 cslb2000 该类别下有 25 个回答。邀请回答 ggfx 该类别下有 23 个回答。邀请回答珠海易胜该类别下有 23 个回答。邀请回答 h1654155958.0210 该类别下有 22 个回答。邀请回答 hrtuoyu 该类别下有 22 个回答。邀请回答 ncmza 该类别下有 21 个回答。邀请回答 shaoye88 该类别下有 21 个回答。邀请回答瑾年Invader 该类别下有 20 个回答。邀请回答望望Ll 该类别下有 20 个回答。邀请回答 april_yu 该类别下有 20 个回答。邀请回答 zkzk196599 该类别下有 19 个回答。邀请回答 nvwuwy 该类别下有 18 个回答。邀请回答 lucas_songlea 该类别下有 18 个回答。邀请回答 fan7572 该类别下有 17 个回答。邀请回答 zhan81411 该类别下有 17 个回答。邀请回答举报张龙相关推荐 • AN75779构建错误 1410 • cx3 uvc demo和fx3 uvc demo之间的区别 4431 • 如何将UVC类设备绑定到cypress驱动程序 1678 • AN75779 sensor端I2C坏掉了，会怎么样？ 326 • 1080P30FPS使用AN7799提交Buffer Failure 3846 • 如何在an75779中构建固件示例？ 1482 • AN75779：缺少附加的代码文件？怎么下载？ 912 • 关于UVC中fx3等时模式的问题 4098 • 需要帮助传输和处理RAW视频数据 3307 • CX3帧率怎么控制 1920 1个回答

答案对人有帮助，有参考价值 0 V4L2GRAPH挂起是由于格式错误。运行MPER显示，只有一半的预期像素输出：框架太小！（921600和1843200）格式错误？在调整YCbCr格式后，M播放现在没有上述运行，V4L2GRAP将完成与抓取的图像。 “失败查询”内核消息仍然存在，但似乎并不致命。以上来自于百度翻译以下为原文 The v4l2grab hang was due to a format error. Running mplayer revealed that there were only half of the expected pixels being output: Frame too small! (921600<1843200) Wrong format? After adjusting the YCbCr format mplayer now runs without the above, and v4l2grab will complete with the grabbed image. The "Failed to query" kernel message is still there, but it does not seem to be fatal.

2019-1-7 14:44:10 评论举报张龙