c - 如何解释 ffmpeg AVERROR

Question

有人知道 AVERROR 含义的列表在哪里吗？就像是

-1: reason A
-2: reason B

等等？

Answer 1

您可以使用av_strerror()来获取错误代码的字符串表示形式。

如果您只是想查找它，可以参考libavutil/error.c和libavutil/error.h的文档。

Answer 2

采用

printf("%s", av_err2str(ret));

其中 ret 是从函数返回的整数（例如 avformat_open_input(...)）。

Answer 3

给你（取自libavutil/error.c）：

{ ERROR_TAG(BSF_NOT_FOUND),      "Bitstream filter not found"                     },
{ ERROR_TAG(BUG),                "Internal bug, should not have happened"         },
{ ERROR_TAG(BUG2),               "Internal bug, should not have happened"         },
{ ERROR_TAG(BUFFER_TOO_SMALL),   "Buffer too small"                               },
{ ERROR_TAG(DECODER_NOT_FOUND),  "Decoder not found"                              },
{ ERROR_TAG(DEMUXER_NOT_FOUND),  "Demuxer not found"                              },
{ ERROR_TAG(ENCODER_NOT_FOUND),  "Encoder not found"                              },
{ ERROR_TAG(EOF),                "End of file"                                    },
{ ERROR_TAG(EXIT),               "Immediate exit requested"                       },
{ ERROR_TAG(EXTERNAL),           "Generic error in an external library"           },
{ ERROR_TAG(FILTER_NOT_FOUND),   "Filter not found"                               },
{ ERROR_TAG(INVALIDDATA),        "Invalid data found when processing input"       },
{ ERROR_TAG(MUXER_NOT_FOUND),    "Muxer not found"                                },
{ ERROR_TAG(OPTION_NOT_FOUND),   "Option not found"                               },
{ ERROR_TAG(PATCHWELCOME),       "Not yet implemented in FFmpeg, patches welcome" },
{ ERROR_TAG(PROTOCOL_NOT_FOUND), "Protocol not found"                             },
{ ERROR_TAG(STREAM_NOT_FOUND),   "Stream not found"                               },
{ ERROR_TAG(UNKNOWN),            "Unknown error occurred"                         },

但这是与版本相关的方式，最好av_strerror()让库为您提供错误代码的字符串表示形式。

Answer 4

请注意，大多数函数都会返回 NEGATIVE 错误。所以你必须调用 av_strerror(-returnvalue)