我想只播放一个视频文件的音频,使用 libvlc
. 我怎么做呢?
这是我的代码。
#include <vlc/vlc.h>
#include <chrono>
#include <iostream>
#include <string>
#include <thread>
#include <vector>
int main()
{
libvlc_instance_t *inst = libvlc_new(0, nullptr);
char const *location = "mario_00.webm";
libvlc_media_t *vlc_media = libvlc_media_new_path(inst, location);
libvlc_media_player_t *vlc_player = libvlc_media_player_new_from_media(vlc_media);
libvlc_media_player_play(vlc_player); //this line will play the video and audio
while(1){
if(libvlc_media_get_state(vlc_media) == libvlc_Ended){
break;
}
std::this_thread::sleep_for(std::chrono::seconds(1));
}
libvlc_media_player_release(vlc_player);
libvlc_media_release(vlc_media);
libvlc_release(inst);
}
您可以指定以下选项 --no-video
与 libvlc_new() 参数。
它的声明是
libvlc_instance_t* libvlc_new( int argc, const char *const *argv )
所以,会是这样的。
const char* argv[] = { "--no-video" };
libvlc_instance_t *inst = libvlc_new( 1, argv );
另一个选择,就像在这里面提到的 纫,是选项 --vout none
. 这样一来,代码就变成了。
const char* argv[] = { "--vout", "none" };
libvlc_instance_t *inst = libvlc_new( 2, argv );
但是,当媒体(音频)被播放时,你会得到一个连续的错误流。
[00007f8da808b7f0] main video output error: video output creation failed
[00007f8dc741e930] main decoder error: failed to create video output
[00007f8da80d2250] main video output error: video output creation failed
[00007f8dc741e930] main decoder error: failed to create video output
[00007f8da80d2250] main video output error: video output creation failed
[00007f8dc741e930] main decoder error: failed to create video output
[h264 @ 0x7f8dc74422e0] get_buffer() failed
[h264 @ 0x7f8dc74422e0] thread_get_buffer() failed
[h264 @ 0x7f8dc74422e0] decode_slice_header error
[h264 @ 0x7f8dc74422e0] no frame!
[00007f8da4045f80] main video output error: video output creation failed
[00007f8dc741e930] main decoder error: failed to create video output
[h264 @ 0x7f8dc7453f60] get_buffer() failed
[h264 @ 0x7f8dc7453f60] thread_get_buffer() failed
[h264 @ 0x7f8dc7453f60] decode_slice_header error
[h264 @ 0x7f8dc7453f60] no frame!
[00007f8d9c045f80] main video output error: video output creation failed
[00007f8dc741e930] main decoder error: failed to create video output
[h264 @ 0x7f8dc7499c40] get_buffer() failed
[h264 @ 0x7f8dc7499c40] thread_get_buffer() failed
[h264 @ 0x7f8dc7499c40] decode_slice_header error
[h264 @ 0x7f8dc7499c40] no frame!
同样的错误也可以用 摄像机的安装和调试。 像这样。
libvlc_media_player_set_nsobject( vlc_player, nullptr );
在这种情况下,你不必通过... argc
和 argv
到 libvlc_new()
.