如题，
我正在使用 ffmpeg 在 Mac 上开发一个项目。它在我的 Mac 上运行，将帧编码为 vp9 和 vp8。但是当我在 ubuntu 中的 docker 映像上运行它时，函数avcodec_open2()返回-22错误。（仅适用于 vp9&vp8，h264 有效）。
我想知道错误是否来自设置参数部分？但是让它在mac上运行但在ubuntu中运行仍然很奇怪。
有没有人有类似的经历？
bool open_video(AVFormatContext * oc,AVCodec * codec,OutputStream * ost,AVDictionary * opt_arg, bool reduceQuality) {
int ret;
AVCodecContext * c = ost->st->codec;
AVDictionary * opt = NULL;
av_dict_copy(&opt,opt_arg,0);
if(codec264){
// http://arstechnica.com/civis/viewtopic.php?f=6&t=1239375
av_dict_set(&opt,"refs", "3", 0);
av_dict_set(&opt,"vprofile","main", 0); // 2 versions to support differents libav/ffmpeg
av_dict_set(&opt,"profile", "main", 0);
//av_dict_set(&opt,"preset","superfast",0);
//av_dict_set(&opt,"preset","ultrafast",0);
av_dict_set(&opt,"preset","superfast",0);
//av_dict_set(&opt,"preset","slow",0);
//https://mattgadient.com/2013/06/12/a-best-settings-guide-for-handbrake-0-9-9/
//av_dict_set(&opt, "tune", "zerolatency", 0); //bluerry but very small size
//av_dict_set(&opt, "tune", "fastdecode", 0); // hd but large size
// 23 300k, 29 150k, 35 75k
if(reduceQuality)
av_dict_set(&opt, "crf", "35", 0); //35 +-6 decrease/increase bitrate half/twice
else
av_dict_set(&opt, "crf", "29", 0); //29 +-6 decrease/increase bitrate half/twice
}
else if (codecVP9)
{
// Setting explanation:
// http://wiki.webmproject.org/ffmpeg/vp9-encoding-guide
// https://developers.google.com/media/vp9/live-encoding/
// https://developers.google.com/media/vp9/settings/vod/
// https://developers.google.com/media/vp9/bitrate-modes/
if(reduceQuality) //crf is the quality value for VP9 (0-63), lower the better quality youll get
av_dict_set(&opt, "crf" , "40", 0);
else
av_dict_set(&opt, "crf" , "45", 0);
av_dict_set(&opt, "speed" , "8" , 0);
av_dict_set(&opt, "quality", "realtime", 0); //realtime is recommended
//av_dict_set(&opt, "threads", "4" , 0);
//av_dict_set(&opt, "tile-columns", "2", 0);
//av_dict_set(&opt, "frame-parallel", "1", 0);
//av_dict_set(&opt, "row-mt", "1", 0);
av_dict_set(&opt, "b:v", "1", 0);
av_dict_set(&opt, "g", "400", 0); //key frame interval (big difference in vid size)
//av_dict_set(&opt, "maxrate", "3k", 0);
//av_dict_set(&opt, "minrate", "1k", 0);
//av_dict_set(&opt, "hwaccel", "vaapi", 0);
//av_dict_set(&opt, "c:v", "libvpx-vp9", 0);
}
else if (codecVP8)
{
// https://trac.ffmpeg.org/wiki/Encode/VP8
av_dict_set(&opt, "passes" , "1" , 0);
av_dict_set(&opt, "cpu-used" , "15" , 0);
av_dict_set(&opt, "qmax" , "63", 0);
av_dict_set(&opt, "rt" , "", 0); // realtime setting
//av_dict_set(&opt, "crf" , "10", 0);
if(reduceQuality)
av_dict_set(&opt, "qmin" , "40", 0); // Lower quality, smaller sizes
else
av_dict_set(&opt, "qmin" , "35", 0); // Higher quality, larger sizes
}
else
{
if(reduceQuality)
av_dict_set(&opt, "x265-params", "crf=29", 0);
else
av_dict_set(&opt, "x265-params", "crf=23", 0);
av_dict_set(&opt, "preset", "ultrafast", 0);
av_dict_set(&opt, "tune", "zerolatency", 0);
// av_dict_set(&opt, "profile", "main", 0);
}
// Open the codec
ret = avcodec_open2(c,codec,&opt);
av_dict_free(&opt);
if (ret < 0) {
cout << "Could not open video codec. (error code:" << ret << ")\n";
return false;
} // if
编辑：有谁知道ffmpeg-linux是否使用不同的参数名称从其他平台（如Mac）进行设置？
Eidt2：似乎即使我没有设置任何选项参数，它仍然给我-22错误。前任：ret = avcodec_open2(c, codec, NULL)