* decode the following frames into another rawvideo file. */fprintf(stderr,"Error: Width, height and pixel format have to be ""constant in a rawvideo file, but the width, height or ""pixel format of the input video changed:\n""old: width = %d, height = %d, format = %s\n""new...
Output #0, image2, to '1.jpg': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.29.100 Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 640x360, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default) Metadata: handler_name ...
Output #0, image2, to '1.jpg': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.29.100 Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 640x360, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default) Metadata: handler_name ...
* ffmpeg -i "rtsp://admin123:tang3shan@112.31.211.240:554/cam/realmonitor?channel=7&subtype=1" -y -f image2 -ss 00:00:03 -vframes 1 -s 640x360 1.jpg */ // 回调函数的参数,时间和有无流的判断 typedefstruct { time_tlasttime; boolconnected; }Runner; // 回调函数 intinterrupt_call...
MEDIA_TYPE_VIDEO){videoStream=i;break;}}if(videoStream==-1){return0;}AVCodecContext*pCodecCtxOrig=nullptr;// Get a pointer to the codec context for the video streampCodecCtxOrig=pFormatCtx->streams[videoStream]->codec;AVCodec*pCodec=nullptr;// Find the decoder for the video streampCodec=...
fprintf(stderr,"Failed to copy %s codec parameters to decoder context\n", av_get_media_type_string(AVMEDIA_TYPE_VIDEO)); return -1; } avcodec_open2(codeCtx,codec,NULL); frame = av_frame_alloc(); if (!frame){ fprintf(stderr,"Could not allocate video frame\n"); ...
使用ffmpeg获取视频的第一帧关键帧,转换成UIImage,然后保存成jpg图片。如果不需要持久化,直接使用UIImage对象即可 ffmpeg手动集成 我直接使用了ffmpeg-kit进行ffmpeg的打包,打包脚本如下 ffmpeg-kit/tools/release/ios.sh 最后可以在以下目录找到产物 ffmpeg-kit/prebuilt/bundle-apple-cocoapods-ios/ffmpeg-kit-ios-min...
int yuv420_to_jpg(void *data,int w,int h,char *file) { av_register_all(); AVFormatContext *pFormatCtx = avformat_alloc_context(); AVOutputFormat *fmt = av_guess_format("mjpeg", NULL, NULL);pFormatCtx->oformat = fmt;if(avio_open(&pFormatCtx->pb,file, AVIO_FLAG_READ_WRITE) <...
ffmpeg -i videoclip.avi -ss 01:23:45 image.jpg 从视频中生成GIF GIF是比较常见的动图的格式,在网络上普遍使用。需要注意的GIF中的帧是未压缩的,帧数不能太多,否则可能导致生成文件过大。使用下面命令行可以从.flv中生成GIF。 ffmpeg -i promotion.swf -pix_fmt rgb24 promotion.gif ...
width,padding,height,subsample,jpeg_buffer,jpeg_size,quality,flags); if(ret<0) { printf("compresstojpegfailed:%s\n",tjGetErrorStr()); } tjDestroy(handle); returnret; } intmain(intargc,char**argv){ intret; intvideoindex=-1; AVFormatContext*fmtCtx=NULL; AVCodecContext*c=NULL;