使用QtAV进行视频缩略图
我正在使用精彩的使用QtAV进行视频缩略图,qt,video,qt5,qt4,thumbnails,Qt,Video,Qt5,Qt4,Thumbnails,我正在使用精彩的[QtAV](https://github.com/wang-bin/QtAV/)执行视频解码的软件包。我想要实现的是获取视频的缩略图。以下是我迄今为止所做的工作 bool saveThumb( QString videoFile ) { AVDemuxer *demux = new AVDemuxer(); demux->setSeekUnit( SeekByFrame ); demux->setSeekType( KeyFrameSeek
[QtAV](https://github.com/wang-bin/QtAV/)
执行视频解码的软件包。我想要实现的是获取视频的缩略图。以下是我迄今为止所做的工作
bool saveThumb( QString videoFile ) {
AVDemuxer *demux = new AVDemuxer();
demux->setSeekUnit( SeekByFrame );
demux->setSeekType( KeyFrameSeek );
VideoDecoder *vdec = VideoDecoder::create( VideoDecoderId_FFmpeg );
demux->setMedia( videoFile );
qDebug() << "Loading file:" << demux->load();
qDebug() << "Seeking to 50%" << demux->seek( 0.5 );
qDebug() << "Reading frame:" << demux->readFrame();
vdec->setCodecContext( demux->videoCodecContext() );
vdec->open();
Packet pkt = demux->packet();
qDebug() << "Packet valid:" << pkt.isValid();
qDebug() << "Decoding packet:" << vdec->decode( pkt );
VideoFrame frame = vdec->frame();
qDebug() << "Valid frame:" << frame.isValid();
QImage img = frame.toImage();
qDebug() << "Valid image:" << ( not img.isNull() );
bool saved = img.save( videoFile + ".jpg" );
return saved;
}
bool saveThumb(QString视频文件){
AVDemuxer*demux=新的AVDemuxer();
demux->setSeekUnit(参见KByFrame);
demux->setSeekType(关键帧Seek);
VideoDecoder*vdec=视频解码器::创建(VideoDecodeGrid_FFmpeg);
解复用->设置媒体(视频文件);
qDebug()打开();
数据包pkt=demux->Packet();
qDebug()要获取视频缩略图,只需使用QtAVVideoFrameExtractor
类,如:
#include "QtAV/VideoFrameExtractor.h"
...
bool saveThumb(const QString& videoFile) {
auto extractor = new QtAV::VideoFrameExtractor;
connect(
extractor,
&QtAV::VideoFrameExtractor::frameExtracted,
extractor,
[this, extractor, videoFile](const QtAV::VideoFrame& frame) {
const auto& img = frame.toImage();
auto saved = img.save(videoFile + ".jpg" );
extractor->deleteLater();
});
connect(
extractor,
&QtAV::VideoFrameExtractor::error,
extractor,
[this, extractor](const QString& errorStr) {
qDebug() << errorStr;
extractor->deleteLater();
});
extractor->setAsync(true);
extractor->setSource(videoFile);
extractor->setPosition(1);
}
#包括“QtAV/VideoFrameExtractor.h”
...
bool saveThumb(const QString和videoFile){
自动提取器=新的QtAV::VideoFrameExtractor;
连接(
提取器,
&QtAV::VideoFrameExtractor::frameExtracted,
提取器,
[此,提取器,视频文件](常量QtAV::视频帧和帧){
const auto&img=frame.toImage();
自动保存=img.save(videoFile+“.jpg”);
提取器->deleteLater();
});
连接(
提取器,
&QtAV::VideoFrameExtractor::错误,
提取器,
[this,extractor](常量QString&errorStr){
qDebug()deleteLater();
});
提取器->设置异步(true);
提取器->设置源(视频文件);
提取器->设置位置(1);
}