FFmpeg av_guess_format返回NULL [英] FFmpeg av_guess_format returns NULL

问题描述

我正在以下示例代码： http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/output-example_8c-source.html

I'm following the example code here: http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/output-example_8c-source.html

我的代码如下：

fmt = av_guess_format(NULL, filename, NULL);
if (!fmt) {
        LOGE(1,"Could not deduce output format from file extension: using MPEG.\n");
        fmt = av_guess_format("mp4", NULL, NULL);
}
    if (!fmt) {
        LOGE(1, "Could not find suitable output format\n");
        exit(1);
}

我称之为av_guess_format的两次，它都是返回NULL两次。
我预先调用av_register_all（）和avcodec_register_all（）。

The two times that I call av_guess_format, it is returning NULL both times. I am calling both av_register_all() and avcodec_register_all() beforehand.

有什么想法为什么这会返回NULL？

Any ideas as to why this is returning NULL?

提前感谢

推荐答案

av_guess_format返回NULL，因为我没有正确配置FFMPEG以允许对于任何格式。

av_guess_format was returning NULL because I hadn't properly configured FFMPEG to allow for ANY formats.

我重新配置了FFMPEG以允许mp4和其他，现在它的作品

I re-configured FFMPEG to allow mp4 and others, and now it works

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