我想播放使用libVLC和OpenCV從IP攝像頭(H264-codec)獲得的視頻文件,因此我從this post獲取了代碼,然後在VS中創建項目2010,並將我的mp4文件放入項目文件夾(「5.mp4」)。當我開始它 - 我得到這個錯誤:使用libVLC打開mp4並在OpenCV中播放C++
main error: open of `5.mp4' failed
main error: Your input can't be opened
main error: VLC is unable to open the MRL '5.mp4'. Check the log for details.
這裏是我的代碼:
#include <vlc/vlc.h>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <stdio.h>
using namespace cv;
using namespace std;
struct VideoDataStruct {
int param;
};
int done = 0;
libvlc_media_player_t *mp;
unsigned int videoBufferSize = 0;
uint8_t *videoBuffer = 0;
void cbVideoPrerender(void *p_video_data, uint8_t **pp_pixel_buffer, int size) {
// Locking
if (size > videoBufferSize || !videoBuffer)
{
printf("Reallocate raw video buffer\n");
free(videoBuffer);
videoBuffer = (uint8_t *) malloc(size);
videoBufferSize = size;
}
*pp_pixel_buffer = videoBuffer;
}
void cbVideoPostrender(void *p_video_data, uint8_t *p_pixel_buffer, int width, int height, int pixel_pitch, int size, int64_t pts) {
// Unlocking
//CloseHandle(hMutex);
}
static void handleEvent(const libvlc_event_t* pEvt, void* pUserData) {
libvlc_time_t time;
switch(pEvt->type)
{
case libvlc_MediaPlayerTimeChanged:
time = libvlc_media_player_get_time(mp);
printf("MediaPlayerTimeChanged %lld ms\n", (long long)time);
break;
case libvlc_MediaPlayerEndReached:
printf ("MediaPlayerEndReached\n");
done = 1;
break;
default:
printf("%s\n", libvlc_event_type_name(pEvt->type));
}
}
int main(int argc, char* argv[]) {
// VLC pointers
libvlc_instance_t *inst;
libvlc_media_t *m;
void *pUserData = 0;
VideoDataStruct dataStruct;
// VLC options
char smem_options[1000];
// RV24
sprintf(smem_options
, "#transcode{vcodec=RV24}:smem{"
"video-prerender-callback=%lld,"
"video-postrender-callback=%lld,"
"video-data=%lld,"
"no-time-sync},"
, (long long int)(intptr_t)(void*)&cbVideoPrerender
, (long long int)(intptr_t)(void*)&cbVideoPostrender
, (long long int)(intptr_t)(void*)&dataStruct
);
const char * const vlc_args[] = {
"-I", "dummy", // Don't use any interface
"--ignore-config", // Don't use VLC's config
"--extraintf=logger", // Log anything
"--verbose=1", // Be verbose
"--sout", smem_options // Stream to memory
};
// We launch VLC
inst = libvlc_new(sizeof(vlc_args)/sizeof(vlc_args[0]), vlc_args);
/* Create a new item */
m = libvlc_media_new_location(inst, "5.mp4");
/* Create a media player playing environement */
mp = libvlc_media_player_new_from_media (m);
libvlc_event_manager_t* eventManager = libvlc_media_player_event_manager(mp);
libvlc_event_attach(eventManager, libvlc_MediaPlayerTimeChanged, handleEvent, pUserData);
libvlc_event_attach(eventManager, libvlc_MediaPlayerEndReached, handleEvent, pUserData);
libvlc_event_attach(eventManager, libvlc_MediaPlayerPositionChanged, handleEvent, pUserData);
libvlc_video_set_format(mp, "RV24", 1280, 720, 1280* 3);
/* play the media_player */
libvlc_media_player_play (mp);
while(1)
{
if(videoBuffer) // Check for invalid input
{
// CV_8UC3 = 8 bits, 3 chanels
Mat img = Mat(Size(1280, 720), CV_8UC3, videoBuffer);
// cvtColor(img, img, CV_RGB2BGR);
namedWindow("Display window", WINDOW_AUTOSIZE); // Create a window for display.
imshow("Display window", img); // Show our image inside it.
}
}
libvlc_release (inst);
}
我猜,這很容易解決,但我便無法找到在互聯網的任何信息。我也嘗試把它放到「C:\ 5.mp4」中,但我得到了同樣的錯誤。謝謝你的幫助。
編輯: 好了,我修復了這個問題,我需要把文件:///「5.mp4」之前,現在我的視頻播放,但它看起來像這樣:
EDIT02 好了,用「* .AVI」一切看起來都不錯,所以我想這個文件的問題 - 我記錄了它FROP IP攝像頭,使用VLC,並保存成* .MP4
你試過類似'cvtColor(img,img,CV_YUV2BGR_I420);' – 2015-02-24 06:33:35
我試過了,結果差不多 - 很多線條,但現在有不同的顏色。 – 2015-02-24 06:41:32
爲什麼你評論這行'libvlc_video_set_format(mp,「RV24」,240,320,240 * 3);'?您需要指定視頻格式。你嘗試取消註釋嗎? – OpenMinded 2015-02-24 06:45:04