C#使用FFmpeg 将视频格式转换成Gif图片示例

本文介绍了一款基于EFmpeg的视频转换工具,该工具能够将视频文件转换为GIF动画。通过设置不同的参数,如输出文件尺寸、帧数等,可以定制GIF的输出效果。文章还提供了一个C#代码示例,演示了如何调用此工具进行视频到GIF的转换。

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根据EFmpeg封装的视频转换gif工具:https://my.oschina.net/tianma3798/blog/825317

一、本次使用参数说明

/*
    * 参数说明:
    * -i 源文件位置
    * -y 输出新文件,是否覆盖现有文件
    * -s 视频比例  4:3 320x240/640x480/800x600  16:9  1280x720 ,默认值 'wxh',和原视频大小相同
    * -f 等同‘-formats’,定义的可支持的文件格式‘ffmpeg-formats’,更多参考:https://ffmpeg.org/ffmpeg-formats.html
    * -vframes 数字类型,指定视频输出帧数
    * -dframes 数字类型,指定数据输出帧数,截取的前n帧
    * -frames[:stream_specifier] framecount (output,per-stream) 停止写入流之后帧数帧。
    */

二、代码示例:

class GifDemo1
{
    public static string ffmpegtool = @"F:\SolutionSet\ABCSolution\VideoSolution\Demo1\bin\Debug\ffmpeg.exe";
    public static string imgFile = @"F:\SolutionSet\ABCSolution\VideoSolution\VideoSolution\Content\Video\my3.gif";
    public static string sourceFile = @"F:\SolutionSet\ABCSolution\VideoSolution\VideoSolution\Content\Video\COOLUI.mp4";
    public void ConvertVideoToGif()
    {
        Process p = new Process();//建立外部调用进程
        //要调用外部程序的绝对路径
        p.StartInfo.FileName = ffmpegtool;
        //转化gif动画
        string strArg = "-i " + sourceFile + " -y -s 1280x720 -f gif -vframes 30 " + imgFile;
        //string strArg = "  -i " + sourceFile + " -y  -f gif -vframes 50 " + imgFile;
        // string strArg = "  -i " + sourceFile + " -y  -f gif -ss 0:20  -dframes 10 -frames 50 " + imgFile;

        p.StartInfo.Arguments = strArg;

        p.StartInfo.UseShellExecute = false;//不使用操作系统外壳程序启动线程(一定为FALSE,详细的请看MSDN)
        p.StartInfo.RedirectStandardError = true;//把外部程序错误输出写到StandardError流中(这个一定要注意,FFMPEG的所有输出信息,都为错误输出流,用StandardOutput是捕获不到任何消息的...)
        p.StartInfo.CreateNoWindow = false;//不创建进程窗口
        p.ErrorDataReceived += new DataReceivedEventHandler(Output);//外部程序(这里是FFMPEG)输出流时候产生的事件,这里是把流的处理过程转移到下面的方法中,详细请查阅MSDN
        p.Start();//启动线程
        p.BeginErrorReadLine();//开始异步读取
        p.WaitForExit();//阻塞等待进程结束
        p.Close();//关闭进程
        p.Dispose();//释放资源
    }
    private void Output(object sendProcess, DataReceivedEventArgs output)
    {
        if (!String.IsNullOrEmpty(output.Data))
        {
            //处理方法...
            Console.WriteLine(output.Data);
        }
    }
}

响应内容:

 

 

更多参考:

C#使用FFmpeg 将视频格式转换成MP4示例

ffmpeg ffplay ffprobe资料整理

实现拖动文件到窗体(控件)

根据提供的引用内容,您可以使用FFmpeg API在C#中编写程序,以实现将H264关键帧转换为BMP的功能。以下是大致的流程原理: 1.使用FFmpeg API解复用mp4文件,得到一个视频流。 2.将视频流解码为yuv序列。 3.将yuv序列中指定的一帧图片内容转换为rgb。 4.将rgb数据存储为bmp位图。 以下是一个C#示例代码: ```csharp using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; namespace H264ToBmp { class Program { static void Main(string[] args) { // 初始化FFmpeg FFmpeg.av_register_all(); FFmpeg.avcodec_register_all(); // 打开输入文件 string inputFileName = "input.mp4"; AVFormatContext* inputFormatContext = null; if (FFmpeg.avformat_open_input(&inputFormatContext, inputFileName, null, null) != 0) { Console.WriteLine("无法打开输入文件"); return; } // 查找视频流 int videoStreamIndex = -1; for (int i = 0; i < inputFormatContext->nb_streams; i++) { if (inputFormatContext->streams[i]->codecpar->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO) { videoStreamIndex = i; break; } } if (videoStreamIndex == -1) { Console.WriteLine("无法找到视频流"); return; } // 打开视频解码器 AVCodec* videoCodec = FFmpeg.avcodec_find_decoder(inputFormatContext->streams[videoStreamIndex]->codecpar->codec_id); if (videoCodec == null) { Console.WriteLine("无法找到视频解码器"); return; } AVCodecContext* videoCodecContext = FFmpeg.avcodec_alloc_context3(videoCodec); if (FFmpeg.avcodec_parameters_to_context(videoCodecContext, inputFormatContext->streams[videoStreamIndex]->codecpar) < 0) { Console.WriteLine("无法初始化视频解码器上下文"); return; } if (FFmpeg.avcodec_open2(videoCodecContext, videoCodec, null) < 0) { Console.WriteLine("无法打开视频解码器"); return; } // 查找关键帧 AVPacket packet = new AVPacket(); AVFrame* frame = FFmpeg.av_frame_alloc(); int gotPicture = 0; while (FFmpeg.av_read_frame(inputFormatContext, &packet) >= 0) { if (packet.stream_index == videoStreamIndex) { if (FFmpeg.avcodec_decode_video2(videoCodecContext, frame, &gotPicture, &packet) < 0) { Console.WriteLine("无法解码视频帧"); return; } if (gotPicture != 0 && (frame->key_frame != 0 || frame->pict_type == AVPictureType.AV_PICTURE_TYPE_I)) { break; } } FFmpeg.av_packet_unref(&packet); } // 将yuv序列转换为rgb SwsContext* swsContext = FFmpeg.sws_getContext(videoCodecContext->width, videoCodecContext->height, videoCodecContext->pix_fmt, videoCodecContext->width, videoCodecContext->height, AVPixelFormat.AV_PIX_FMT_RGB24, 0, null, null, null); AVFrame* rgbFrame = FFmpeg.av_frame_alloc(); byte_ptrArray4 rgbData = new byte_ptrArray4(); int rgbDataSize = FFmpeg.av_image_alloc(rgbData, null, videoCodecContext->width, videoCodecContext->height, AVPixelFormat.AV_PIX_FMT_RGB24, 1); FFmpeg.sws_scale(swsContext, frame->data, frame->linesize, 0, videoCodecContext->height, rgbData, rgbFrame->linesize); // 将rgb数据存储为bmp位图 Bitmap bmp = new Bitmap(videoCodecContext->width, videoCodecContext->height, videoCodecContext->width * 3, PixelFormat.Format24bppRgb, new IntPtr(rgbData[0])); bmp.Save("output.bmp", ImageFormat.Bmp); // 释放资源 FFmpeg.avformat_close_input(&inputFormatContext); FFmpeg.avcodec_free_context(&videoCodecContext); FFmpeg.av_frame_free(&frame); FFmpeg.sws_freeContext(swsContext); FFmpeg.av_frame_free(&rgbFrame); FFmpeg.av_freep(&rgbData[0]); } } public unsafe static class FFmpeg { private const string DllName = "ffmpeg.dll"; [DllImport(DllName)] public static extern void av_register_all(); [DllImport(DllName)] public static extern void avcodec_register_all(); [DllImport(DllName)] public static extern int avformat_open_input(AVFormatContext** ps, string url, AVInputFormat* fmt, AVDictionary** options); [DllImport(DllName)] public static extern int avcodec_decode_video2(AVCodecContext* avctx, AVFrame* picture, int* got_picture_ptr, AVPacket* avpkt); [DllImport(DllName)] public static extern AVCodec* avcodec_find_decoder(AVCodecID id); [DllImport(DllName)] public static extern AVCodecContext* avcodec_alloc_context3(AVCodec* codec); [DllImport(DllName)] public static extern int avcodec_parameters_to_context(AVCodecContext* codec, AVCodecParameters* par); [DllImport(DllName)] public static extern int avcodec_open2(AVCodecContext* avctx, AVCodec* codec, AVDictionary** options); [DllImport(DllName)] public static extern int av_read_frame(AVFormatContext* s, AVPacket* pkt); [DllImport(DllName)] public static extern void av_packet_unref(AVPacket* pkt); [DllImport(DllName)] public static extern AVFrame* av_frame_alloc(); [DllImport(DllName)] public static extern SwsContext* sws_getContext(int srcW, int srcH, AVPixelFormat srcFormat, int dstW, int dstH, AVPixelFormat dstFormat, int flags, SwsFilter* srcFilter, SwsFilter* dstFilter, double* param); [DllImport(DllName)] public static extern int av_image_alloc(byte_ptrArray4 pointers, int_array4 linesizes, int w, int h, AVPixelFormat pix_fmt, int align); [DllImport(DllName)] public static extern void sws_scale(SwsContext* c, byte_ptrArray4 srcSlice, int_array4 srcStride, int srcSliceY, int srcSliceH, byte_ptrArray4 dst, int_array4 dstStride); [DllImport(DllName)] public static extern void sws_freeContext(SwsContext* swsContext); [DllImport(DllName)] public static extern void av_frame_free(AVFrame** frame); [DllImport(DllName)] public static extern void avcodec_free_context(AVCodecContext** avctx); [DllImport(DllName)] public static extern void avformat_close_input(AVFormatContext** s); [DllImport(DllName)] public static extern void av_freep(void* ptr); } public enum AVMediaType { AVMEDIA_TYPE_UNKNOWN = -1, AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA, AVMEDIA_TYPE_SUBTITLE, AVMEDIA_TYPE_ATTACHMENT, AVMEDIA_TYPE_NB } public enum AVCodecID { AV_CODEC_ID_NONE, /* video codecs */ AV_CODEC_ID_MPEG1VIDEO, AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding AV_CODEC_ID_H261, AV_CODEC_ID_H263, AV_CODEC_ID_RV10, AV_CODEC_ID_RV20, AV_CODEC_ID_MJPEG, AV_CODEC_ID_MJPEGB, AV_CODEC_ID_LJPEG, AV_CODEC_ID_SP5X, AV_CODEC_ID_JPEGLS, AV_CODEC_ID_MPEG4, AV_CODEC_ID_RAWVIDEO, AV_CODEC_ID_MSMPEG4V1, AV_CODEC_ID_MSMPEG4V2, AV_CODEC_ID_MSMPEG4V3, AV_CODEC_ID_WMV1, AV_CODEC_ID_WMV2, AV_CODEC_ID_H263P, AV_CODEC_ID_H263I, AV_CODEC_ID_FLV1, AV_CODEC_ID_SVQ1, AV_CODEC_ID_SVQ3, AV_CODEC_ID_DVVIDEO, AV_CODEC_ID_HUFFYUV, AV_CODEC_ID_CYUV, AV_CODEC_ID_H264, AV_CODEC_ID_INDEO3, AV_CODEC_ID_VP3, AV_CODEC_ID_THEORA, AV_CODEC_ID_ASV1, AV_CODEC_ID_ASV2, AV_CODEC_ID_FFV1, AV_CODEC_ID_4XM, AV_CODEC_ID_VCR1, AV_CODEC_ID_CLJR, AV_CODEC_ID_MDEC, AV_CODEC_ID_ROQ, AV_CODEC_ID_INTERPLAY_VIDEO, AV_CODEC_ID_XAN_WC3, AV_CODEC_ID_XAN_WC4, AV_CODEC_ID_RPZA, AV_CODEC_ID_CINEPAK, AV_CODEC_ID_WS_VQA, AV_CODEC_ID_MSRLE, AV_CODEC_ID_MSVIDEO1, AV_CODEC_ID_IDCIN, AV_CODEC_ID_8BPS, AV_CODEC_ID_SMC, AV_CODEC_ID_FLIC, AV_CODEC_ID_TRUEMOTION1, AV_CODEC_ID_VMDVIDEO, AV_CODEC_ID_MSZH, AV_CODEC_ID_ZLIB, AV_CODEC_ID_QTRLE, AV_CODEC_ID_TSCC, AV_CODEC_ID_ULTI, AV_CODEC_ID_QDRAW, AV_CODEC_ID_VIXL, AV_CODEC_ID_QPEG, AV_CODEC_ID_PNG, AV_CODEC_ID_PPM, AV_CODEC_ID_PBM, AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PAM, AV_CODEC_ID_FFVHUFF, AV_CODEC_ID_RV30, AV_CODEC_ID_RV40, AV_CODEC_ID_VC1, AV_CODEC_ID_WMV3, AV_CODEC_ID_LOCO, AV_CODEC_ID_WNV1, AV_CODEC_ID_AASC, AV_CODEC_ID_INDEO2, AV_CODEC_ID_FRAPS, AV_CODEC_ID_TRUEMOTION2, AV_CODEC_ID_BMP, AV_CODEC_ID_CSCD, AV_CODEC_ID_MMVIDEO, AV_CODEC_ID_ZMBV, AV_CODEC_ID_AVS, AV_CODEC_ID_SMACKVIDEO, AV_CODEC_ID_NUV, AV_CODEC_ID_KMVC, AV_CODEC_ID_FLASHSV, AV_CODEC_ID_CAVS, AV_CODEC_ID_JPEG2000, AV_CODEC_ID_VMNC, AV_CODEC_ID_VP5, AV_CODEC_ID_VP6, AV_CODEC_ID_VP6F, AV_CODEC_ID_TARGA, AV_CODEC_ID_DSICINVIDEO, AV_CODEC_ID_TIERTEXSEQVIDEO, AV_CODEC_ID_TIFF, AV_CODEC_ID_GIF, AV_CODEC_ID_DXA, AV_CODEC_ID_DNXHD, AV_CODEC_ID_THP, AV_CODEC_ID_SGI, AV_CODEC_ID_C93, AV_CODEC_ID_BETHSOFTVID, AV_CODEC_ID_PTX, AV_CODEC_ID_TXD, AV_CODEC_ID_VP6A, AV_CODEC_ID_AMV, AV_CODEC_ID_VB, AV_CODEC_ID_PCX, AV_CODEC_ID_SUNRAST, AV_CODEC_ID_INDEO4, AV_CODEC_ID_INDEO5, AV_CODEC_ID_MIMIC, AV_CODEC_ID_RL2, AV_CODEC_ID_ESCAPE124, AV_CODEC_ID_DIRAC, AV_CODEC_ID_BFI, AV_CODEC_ID_CMV, AV_CODEC_ID_MOTIONPIXELS, AV_CODEC_ID_TGV, AV_CODEC_ID_TGQ, AV_CODEC_ID_TQI, AV_CODEC_ID_AURA, AV_CODEC_ID_AURA2, AV_CODEC_ID_V210X, AV_CODEC_ID_TMV, AV_CODEC_ID_V210, AV_CODEC_ID_DPX, AV_CODEC_ID_MAD, AV_CODEC_ID_FRWU, AV_CODEC_ID_FLASHSV2, AV_CODEC_ID_CDGRAPHICS, AV_CODEC_ID_R210, AV_CODEC_ID_ANM, AV_CODEC_ID_BINKVIDEO, AV_CODEC_ID_IFF_ILBM, AV_CODEC_ID_IFF_BYTERUN1, AV_CODEC_ID_KGV1, AV_CODEC_ID_YOP, AV_CODEC_ID_VP8, AV_CODEC_ID_PICTOR, AV_CODEC_ID_ANSI, AV_CODEC_ID_A64_MULTI, AV_CODEC_ID_A64_MULTI5, AV_CODEC_ID_R10K, AV_CODEC_ID_MXPEG, AV_CODEC_ID_LAGARITH, AV_CODEC_ID_PRORES, AV_CODEC_ID_JV, AV_CODEC_ID_DFA, AV_CODEC_ID_WMV3IMAGE, AV_CODEC_ID_VC1IMAGE, AV_CODEC_ID_UTVIDEO, AV_CODEC_ID_BMV_VIDEO, AV_CODEC_ID_VBLE, AV_CODEC_ID_DXTORY, AV_CODEC_ID_V410, AV_CODEC_ID_XWD, AV_CODEC_ID_CDXL, AV_CODEC_ID_XBM, AV_CODEC_ID_ZEROCODEC,
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