Posted 2024-11-26Updated 2025-06-02網路問題排查a few seconds read (About 32 words)

參考:

https://blog.csdn.net/qq_35995514/article/details/136542702

https://cloud.tencent.com/developer/article/1827834

https://www.alibabacloud.com/help/en/ecs/support/query-and-case-analysis-of-linux-network-traffic-load

Posted 2024-11-25Updated 2025-06-02影音串流a few seconds read (About 22 words)

ffmpeg RTSP串流品質檢測

1	ffmpeg -i rtsp://<伺服器IP>:<埠>/<路徑> -t 30 output.mp4

Posted 2024-11-19Updated 2025-06-02異常重啟a few seconds read (About 55 words)

Ubuntu異常重啟原因查詢

找出最近一次重啟時間

1	last reboot\| head -2

查詢/var/log下的各種log並且找到重啟前的錯誤，包含messages, syslog, dmesg, and kern.log

參考:
https://learnlinux.hashnode.dev/how-to-troubleshooting-unexpected-linux-server-reboot

Posted 2024-11-19Updated 2025-06-02網路設定a few seconds read (About 18 words)

手動新增路由表

Windows

1	route -p add 10.179.101.0 mask 255.255.255.0 10.179.10.254 metric 10

Ubuntu

1	sudo ip route add 10.179.2.0/24 via 10.179.20.254 dev enp75s0f1

Posted 2024-11-15Updated 2025-06-02a few seconds read (About 59 words)

Hexo使用筆記

啟動server

1	hexo server

新增文章

1	hexo new [layout] "文章名稱"

layout 可以是post, page 或 draft

Generate static files

1	$ hexo generate

More info: Generating

Deploy to remote sites

1	$ hexo deploy

More info: Deployment

Posted 2024-11-01Updated 2025-06-02a few seconds read (About 100 words)

函式庫的rpath

查詢硬碟空間

1	du -sh ./*

有時候硬碟空間可能因為資料夾沒有mount，所以雖然占用硬碟空間但是du無法顯示出來，可以使用下面的指令來查看:

1	shopt -s dotglob && sudo mount / /mnt -o bind && du -sh /mnt/* && umount /mnt

參考:
https://www.reddit.com/r/linuxquestions/comments/1ed61ri/root_directory_full_despite_du_adding_up_to_55_of/

https://www.onejar99.com/linux-command-du/

Posted 2024-11-01Updated 2025-06-02a minute read (About 168 words)

函式庫的rpath

linker設定rpath的選項範例如下

1	gcc -Wl,-rpath=/opt/nvidia/deepstream/deepstream-6.4/lib test.cpp

RPATH有一個特殊識別符號$ORIGIN，表示執行檔的所在目錄

1	gcc -Wl,-rpath='$ORIGIN/../lib' test.cpp

查看函式庫的rpath

1	readelf -d libnvds_rest_server.so \|head -20

或是

1	objdump -x libnvds_rest_server.so \|grep 'R.*PATH'

CMake使用兩個變數來控制RPATH：INSTALL_RPATH和BUILD_RPATH，install步驟的rpath是INSTALL_RPATH

1 2	SET_TARGET_PROPERTIES(nvds_rest_server PROPERTIES INSTALL_RPATH "/opt/nvidia/deepstream/deepstream-6.4/lib")

cmake的另一個設定RPATH的方法
https://discourse.cmake.org/t/library-rpath-resolution/887/7
SET(CMAKE_SKIP_BUILD_RPATH FALSE)
SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
SET(CMAKE_INSTALL_RPATH “${ORIGIN}”)

參考:
https://www.cnblogs.com/chanyuantiandao/p/16553199.html

Posted 2024-10-17Updated 2025-06-02a minute read (About 172 words)

Gstreamer使用筆記

關閉程式前發送EOS事件給pipeline的方法

// 發送EOS訊號讓filesink可以正常結束
gst_element_send_event(appCtx[i]->pipeline.pipeline, gst_event_new_eos());
msg = gst_bus_timed_pop_filtered(GST_ELEMENT_BUS (appCtx[i]->pipeline.pipeline), 
GST_CLOCK_TIME_NONE, 
(GstMessageType) (GST_MESSAGE_ERROR | GST_MESSAGE_EOS));//gst_bus_timed_pop_filtered 是synchronously取得訊號，如果沒有訊號會一直等待並把執行續卡住
gst_element_set_state (appCtx[i]->pipeline.pipeline, GST_STATE_NULL);
g_main_loop_quit (main_loop);

https://gstreamer.freedesktop.org/documentation/gstreamer/gstelement.html#gst_element_get_state

https://gstreamer-devel.narkive.com/g1omJFAj/gst-devel-graceful-exit-shutdown-of-a-pipeline#post3

https://stackoverflow.com/questions/38170733/gstreamer-not-flushing-to-the-filesink