• 部分返回值錯誤碼
  • Linux error_base.h
• av_interleaved_write_frame/av_write_frame 返回值

如有錯誤，請指正，謝謝。

部分返回值錯誤碼

ffmpeg原始碼部分返回值形式為：

**AVERROR（EINVAL）**
**AVERROR（EPIPE）**
**AVERROR（ENOMEM）**
......

再看一下ffmpeg內部對於巨集的實現，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

所以大膽猜測（新手，看過的原始碼太少），錯誤碼計數比較小的值應該是作業系統內部定義好的錯誤碼。

Linux error_base.h

#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

av_interleaved_write_frame/av_write_frame 返回值

0代表傳送/寫入成功，負數表示錯誤碼。
我遇到的幾個錯誤碼：
-22：引數錯誤，例如AVPacket的stream_index的值不正確，dts不過濾（沒有遞增）等等
-32：管道阻塞：這個一般是socket錯誤，我遇到的情況是，推流的伺服器斷開了socket連結，導致傳送失敗。（不知道為什麼ffmpeg日誌沒有列印這個。）

歡迎轉載: https://blog.csdn.net/shizheng163