在Ubuntu上尝试编译ffmpeg的教程代码时遇到错误，包括找不到头文件、'img_convert'未定义等问题。通过修改头文件路径、更新函数调用以及替换过时的函数（如用sws_scale替换img_convert），解决了编译问题。
root@ubuntu:/home/zhangbin/code# gcc -o tutorial03 tutorial03.c -lavformat -lavcodec -lz -lm `sdl-config --cflags --libs`
tutorial03.c:1:28: error: ffmpeg/avcodec.h: No such file or directory
tutorial03.c:2:29: error: ffmpeg/avformat.h: No such file or directory
tutorial03.c:16: error: expected specifier-qualifier-list before ‘AVPacketList’
tutorial03.c: In function ‘packet_queue_init’:
tutorial03.c:29: error: ‘PacketQueue’ has no member named ‘mutex’
tutorial03.c:30: error: ‘PacketQueue’ has no member named ‘cond’
tutorial03.c: At top level:
tutorial03.c:32: error: expected declaration specifiers or ‘...’ before ‘AVPacket’
tutorial03.c: In function ‘packet_queue_
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