1. 背景
1.1 ijkplayer 编译完成后是默认播放小码流的即h264 ，如下面的代码所示，但如果需求是播大码流即h265时，通过IJKFFOption好像不行。此时可以更改编译后的IJKMediaFramework源码实现
// choose first h264
if (type == AVMEDIA_TYPE_VIDEO) {
enum AVCodecID codec_id = st->codecpar->codec_id;
video_stream_count++;
if (codec_id == AV_CODEC_ID_H264) {
h264_stream_count++;
if (first_h264_stream < 0)
first_h264_stream = i;
}
2.源码更改
2.1 打开工程位置/ijkplayer-ios/ios/IJKMediaPlayer/IJKMediaPlayer.xcodeproj
2.2 修改ff_ffplay.c文件中read_thread方法，增加if判断
if (type == AVMEDIA_TYPE_VIDEO) {
enum AVCodecID codec_id = st->codecpar->codec_id;
video_stream_count++;
if (codec_id == AV_CODEC_ID_H264) {
h264_stream_count++;
if (first_h264_stream < 0)
first_h264_stream = i;
}
//修改当多路码流时默认选择大码流h265
if(codec_id == AV_CODEC_ID_HEVC){ // edit
if(first_h265_stream<0){
first_h265_stream = i;
}
}
}
}
if (video_stream_count > 1 && st_index[AVMEDIA_TYPE_VIDEO] < 0) {
if(first_h265_stream >=0){ //edit
st_index[AVMEDIA_TYPE_VIDEO] = first_h265_stream;
av_log(NULL, 16 , "multiple video stream found, prefer first h265 stream: %d\n",
first_h264_stream);
}else{
st_index[AVMEDIA_TYPE_VIDEO] = first_h264_stream;
av_log(NULL, 16 , "multiple video stream found, prefer first h264 stream: %d\n",
first_h264_stream);
}
}
