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如有错误，请指正，谢谢。
ffmpeg源码部分返回值形式为：
**AVERROR（EINVAL）****AVERROR（EPIPE）****AVERROR（ENOMEM）**......
再看一下ffmpeg内部对于宏的实现，AVERROR
/* error handling */#if EDOM > 0#define AVERROR(e) (-(e)) ///< Returns a negative error code from a POSIX error code, to return from library functions.#define AVUNERROR(e) (-(e)) ///< Returns a POSIX error code from a library function error return value.#else/* Some platforms have E* and errno already negated. */#define AVERROR(e) (e)#define AVUNERROR(e) (e)#endif
所以大胆猜测（新手，看过的源码太少），错误码计数比较小的值应该是操作系统内部定义好的错误码。
#ifndef _ASM_GENERIC_ERRNO_BASE_H#define _ASM_GENERIC_ERRNO_BASE_H#define EPERM 1 /* Operation not permitted */#define ENOENT 2 /* No such file or directory */#define ESRCH 3 /* No such process */#define EINTR 4 /* Interrupted system call */#define EIO 5 /* I/O error */#define ENXIO 6 /* No such device or address */#define E2BIG 7 /* Argument list too long */#define ENOEXEC 8 /* Exec format error */#define EBADF 9 /* Bad file number */#define ECHILD 10 /* No child processes */#define EAGAIN 11 /* Try again */#define ENOMEM 12 /* Out of memory */#define EACCES 13 /* Permission denied */#define EFAULT 14 /* Bad address */#define ENOTBLK 15 /* Block device required */#define EBUSY 16 /* Device or resource busy */#define EEXIST 17 /* File exists */#define EXDEV 18 /* Cross-device link */#define ENODEV 19 /* No such device */#define ENOTDIR 20 /* Not a directory */#define EISDIR 21 /* Is a directory */#define EINVAL 22 /* Invalid argument */#define ENFILE 23 /* File table overflow */#define EMFILE 24 /* Too many open files */#define ENOTTY 25 /* Not a typewriter */#define ETXTBSY 26 /* Text file busy */#define EFBIG 27 /* File too large */#define ENOSPC 28 /* No space left on device */#define ESPIPE 29 /* Illegal seek */#define EROFS 30 /* Read-only file system */#define EMLINK 31 /* Too many links */#define EPIPE 32 /* Broken pipe */#define EDOM 33 /* Math argument out of domain of func */#define ERANGE 34 /* Math result not representable */#endif
0代表发送/写入成功，负数表示错误码。
我遇到的几个错误码： -22：参数错误，例如AVPacket的stream_index的值不正确，dts不过滤（没有递增）等等 -32：管道阻塞：这个一般是socket错误，我遇到的情况是，推流的服务器断开了socket链接，导致发送失败。（不知道为什么ffmpeg日志没有打印这个。）欢迎转载: