C# 调用FFmpeg处理音视频的示例
FFmpeg 开源、跨平台、体积小、功能强大，提供了录制、转换以及流化音视频的完整解决方案。
官网：https://www.ffmpeg.org/
百科：https://baike.baidu.com/item/ffmpeg/2665727?fr=aladdin
FFmpeg 应用非常广泛，可以用来播放本地视频甚至网络视频，查看音视频信息，还可以用于从视频中提取音频，转换音视频文件格式等等，本文主要介绍如何调用 FFmpeg 来查看音视频信息、从视频中提取音频、转换音视频格式等。
1. 调用FFmpeg
调用原理相当于打开控制台输入命令，只不过在程序中将命令参数进行组合封装，以下是启动代码：
/// <summary>
/// 初始化命令、参数，启动线程
/// </summary>
/// <param name="args"></param>
/// <param name="finishiEvent"></param>
public static void Start(string args, EventHandler finishiEvent)
{
LogHelper.LogInfoFormat("开始执行命令, 参数:{0}", args);
FinishiEvent = finishiEvent;
// ffmpeg.exe组件文件路径
string ffmpegPath = FFmpegBinariesHelper.RegisterFFmpegBinaries();
string cmdType = args.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries)[0];
ProcessStartInfo startInfo = new ProcessStartInfo(Path.Combine(ffmpegPath, cmdType));
startInfo.WindowStyle = ProcessWindowStyle.Normal;
startInfo.Arguments = args.Substring(cmdType.Length);
startInfo.UseShellExecute = false;
startInfo.CreateNoWindow = true;
startInfo.RedirectStandardInput = true;
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;// ffmpeg信息输出是error事件
p.StartInfo = startInfo;
p.OutputDataReceived += P_OutputDataReceived; // ffmpeg信息输出事件
p.ErrorDataReceived += P_OutputDataReceived;
Thread thread = new Thread(startffmpeg);
thread.Start();
}
运行界面：
2. 查看音视频信息
命令如下（注：pcm文件不适用以下命令）：
命令：ffprobe -print_format json -loglevel quiet -show_streams "您的文件" 示例：ffprobe -print_format json -loglevel quiet -show_streams "F:\mp4\3.TF以及地图构建.mp4"
以下是输出的文件格式等信息：
{
"streams": [
{
"index": 0,
"codec_name": "h264",
"codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
"profile": "High",
"codec_type": "video",
"codec_time_base": "1046271/31388000",
"codec_tag_string": "avc1",
"codec_tag": "0x31637661",
"width": 960,
"height": 640,
"coded_width": 960,
"coded_height": 640,
"has_b_frames": 0,
"sample_aspect_ratio": "1:1",
"display_aspect_ratio": "3:2",
"pix_fmt": "yuv420p",
"level": 31,
"chroma_location": "left",
"refs": 1,
"is_avc": "true",
"nal_length_size": "4",
"r_frame_rate": "15/1",
"avg_frame_rate": "15694000/1046271",
"time_base": "1/90000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 188328780,
"duration": "2092.542000",
"bit_rate": "358855",
"bits_per_raw_sample": "8",
"nb_frames": "31388",
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
},
"tags": {
"creation_time": "2020-09-04T01:03:03.000000Z",
"language": "und",
"encoder": "JVT/AVC Coding"
}
},
{
"index": 1,
"codec_name": "aac",
"codec_long_name": "AAC (Advanced Audio Coding)",
"profile": "LC",
"codec_type": "audio",
"codec_time_base": "1/48000",
"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_fmt": "fltp",
"sample_rate": "48000",
"channels": 1,
"channel_layout": "mono",
"bits_per_sample": 0,
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/48000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 100440014,
"duration": "2092.500292",
"bit_rate": "64000",
"max_bit_rate": "66584",
"nb_frames": "98086",
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
},
"tags": {
"creation_time": "2020-09-04T01:03:03.000000Z",
"language": "und"
}
}
]
}
streams 输入信息，如果一个文件中有多个音频或视频，将以数组形式输出，常用参数有： codec_name 表示编码， codec_type 类型， sample_rate 采样率， channels 声道， duration 时长（秒）
3.从视频中提取音频文件
命令：ffmpeg -i "您的视频文件路径" -vn -ar 采样率 "音频文件输出路径" 示例：ffmpeg -i "F:\mp4\3.TF以及地图构建.mp4" -vn -ar 8000 "F:\mp4\3.TF以及地图构建_201215172919_8k.m4a"
以下是处理过程输出信息：
ffmpeg version git-2020-04-17-889ad93 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.3.1 (GCC) 20200328 configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf libavutil 56. 42.102 / 56. 42.102 libavcodec 58. 80.100 / 58. 80.100 libavformat 58. 42.100 / 58. 42.100 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 77.101 / 7. 77.101 libswscale 5. 6.101 / 5. 6.101 libswresample 3. 6.100 / 3. 6.100 libpostproc 55. 6.100 / 55. 6.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'F:\mp4\3.TF浠ュ強鍦板【本文来源：bgp服务器 欢迎转载】浘鏋勫缓.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42isom creation_time : 2020-09-04T01:03:03.000000Z Duration: 00:34:52.54, start: 0.000000, bitrate: 425 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x640 [SAR 1:1 DAR 3:2], 358 kb/s, 15 fps, 15 tbr, 90k tbn, 30 tbc (default) Metadata: creation_time : 2020-09-04T01:03:03.000000Z encoder : JVT/AVC Coding Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 64 kb/s (default) Metadata: creation_time : 2020-09-04T01:03:03.000000Z Stream mapping: Stream #0:1 -> #0:0 (aac (native) -> aac (native)) Press [q] to stop, [?] for help [aac @ 042107c0] Too many bits 8832.000000 > 6144 per frame requested, clamping to max Output #0, ipod, to 'F:\mp4\3.TF浠ュ強鍦板浘鏋勫缓_201215172919_8k.m4a': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42isom encoder : Lavf58.42.100 Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s (default) Metadata: creation_time : 2020-09-04T01:03:03.000000Z encoder : Lavc58.80.100 aac size= 256kB time=00:01:42.40 bitrate= 20.5kbits/s speed= 204x size= 512kB time=00:03:28.64 bitrate= 20.1kbits/s speed= 208x size= 768kB time=00:05:12.19 bitrate= 20.2kbits/s speed= 208x size= 1280kB time=00:06:59.84 bitrate= 25.0kbits/s speed= 210x size= 1536kB time=00:08:38.52 bitrate= 24.3kbits/s speed= 207x size= 1792kB time=00:10:20.41 bitrate= 23.7kbits/s speed= 206x size= 2304kB time=00:12:11.77 bitrate= 25.8kbits/s speed= 209x size= 2560kB time=00:13:55.32 bitrate= 25.1kbits/s speed= 209x size= 2816kB time=00:15:40.41 bitrate= 24.5kbits/s speed= 209x size= 3072kB time=00:17:30.36 bitrate= 24.0kbits/s speed= 210x size= 3584kB time=00:19:17.12 bitrate= 25.4kbits/s speed= 210x size= 3840kB time=00:20:57.85 bitrate= 25.0kbits/s speed= 209x size= 4096kB time=00:22:44.73 bitrate= 24.6kbits/s speed= 210x size= 4608kB time=00:24:15.61 bitrate= 25.9kbits/s speed= 208x size= 4864kB time=00:25:52.63 bitrate= 25.7kbits/s speed= 207x size= 5120kB time=00:27:26.20 bitrate= 25.5kbits/s speed= 205x size= 5376kB time=00:29:04.38 bitrate= 25.2kbits/s speed= 205x size= 5632kB time=00:30:40.12 bitrate= 25.1kbits/s speed= 204x size= 6144kB time=00:32:20.47 bitrate= 25.9kbits/s speed= 204x size= 6400kB time=00:34:38.07 bitrate= 25.2kbits/s speed= 207x size= 6558kB time=00:34:52.54 bitrate= 25.7kbits/s speed= 209x video:0kB audio:6493kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.997352% [aac @ 042107c0] Qavg: 65535.836
4.转换音频格式：
命令：ffmpeg -i "源音频文件" -acodec pcm_s16le -f s16le -ar 目标音频采样率 "目标音频路径" 示例：ffmpeg -i "F:\mp4\3.TF以及地图构建_201215172919_8k.m4a" -acodec pcm_s16le -f s16le -ar 8000 "F:\mp4\3.TF以及地图构建_201215172919_8k_201215173520_8k.pcm"
处理过程输出信息：
ffmpeg version git-2020-04-17-889ad93 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.3.1 (GCC) 20200328 configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf libavutil 56. 42.102 / 56. 42.102 libavcodec 58. 80.100 / 58. 80.100 libavformat 58. 42.100 / 58. 42.100 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 77.101 / 7. 77.101 libswscale 5. 6.101 / 5. 6.101 libswresample 3. 6.100 / 3. 6.100 libpostproc 55. 6.100 / 55. 6.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'F:\mp4\3.TF浠ュ強鍦板浘鏋勫缓_201215172919_8k.m4a': Metadata: major_brand : M4A minor_version : 512 compatible_brands: M4A isomiso2 encoder : Lavf58.42.100 Duration: 00:34:52.63, start: 0.000000, bitrate: 25 kb/s Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 25 kb/s (default) Metadata: handler_name : SoundHandler Stream mapping: Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, s16le, to 'F:\mp4\3.TF浠ュ強鍦板浘鏋勫缓_201215172919_8k_201215173520_8k.pcm': Metadata: major_brand : M4A minor_version : 512 compatible_brands: M4A isomiso2 encoder : Lavf58.42.100 Stream #0:0(und): Audio: pcm_s16le, 8000 Hz, mono, s16, 128 kb/s (default) Metadata: handler_name : SoundHandler encoder : Lavc58.80.100 pcm_s16le size= 32696kB time=00:34:52.54 bitrate= 128.0kbits/s speed=8.63e+03x video:0kB audio:32696kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
5. 软件包下载（以上调用过程和参数已经封装处理，软件目的是调用百度音频识别API将视频中的音频转化为文字）
软件开源代码地址(项目集成文字识别、语音合成、语音识别)：https://gitee.com/bidev_admin/river-int-ai.git
运行软件包下载地址(.Net Framework 4.5)： https://pan.baidu.com/s/1z-WFDGHhEP8tqLqwp9I0Mw 提取码: r3sk
作者：沐汐 Vicky
出处：http://www.cnblogs.com/EasyInvoice
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