C# 調(diào)用FFmpeg處理音視頻的示例
更新時(shí)間：2020年12月18日 12:00:50 作者：沐汐Vicky
這篇文章主要介紹了C# 調(diào)用FFmpeg處理音視頻的示例，幫助大家更好的利用c# 處理音視頻，感興趣的朋友可以了解下
FFmpeg 開(kāi)源、跨平臺(tái)、體積小、功能強(qiáng)大，提供了錄制、轉(zhuǎn)換以及流化音視頻的完整解決方案。
官網(wǎng)：https://www.ffmpeg.org/
百科：https://baike.baidu.com/item/ffmpeg/2665727?fr=aladdin
FFmpeg 應(yīng)用非常廣泛，可以用來(lái)播放本地視頻甚至網(wǎng)絡(luò)視頻，查看音視頻信息，還可以用于從視頻中提取音頻，轉(zhuǎn)換音視頻文件格式等等，本文主要介紹如何調(diào)用 FFmpeg 來(lái)查看音視頻信息、從視頻中提取音頻、轉(zhuǎn)換音視頻格式等。
1. 調(diào)用FFmpeg
調(diào)用原理相當(dāng)于打開(kāi)控制臺(tái)輸入命令，只不過(guò)在程序中將命令參數(shù)進(jìn)行組合封裝，以下是啟動(dòng)代碼：
/// <summary>
/// 初始化命令、參數(shù)，啟動(dòng)線程
/// </summary>
/// <param name="args"></param>
/// <param name="finishiEvent"></param>
public static void Start(string args, EventHandler finishiEvent)
{
LogHelper.LogInfoFormat("開(kāi)始執(zhí)行命令, 參數(shù):{0}", args);
FinishiEvent = finishiEvent;
// ffmpeg.exe組件文件路徑
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信息輸出是error事件
p.StartInfo = startInfo;
p.OutputDataReceived += P_OutputDataReceived; // ffmpeg信息輸出事件
p.ErrorDataReceived += P_OutputDataReceived;
Thread thread = new Thread(startffmpeg);
thread.Start();
}
運(yùn)行界面：
2. 查看音視頻信息
命令如下（注：pcm文件不適用以下命令）：
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以及地圖構(gòu)建.mp4"
以下是輸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 輸入信息，如果一個(gè)文件中有多個(gè)音頻或視頻，將以數(shù)組形式輸出，常用參數(shù)有： codec_name 表示編碼， codec_type 類型， sample_rate 采樣率， channels 聲道， duration 時(shí)長(zhǎng)（秒）
3.從視頻中提取音頻文件
命令：ffmpeg -i "您的視頻文件路徑" -vn -ar 采樣率 "音頻文件輸出路徑" 示例：ffmpeg -i "F:\mp4\3.TF以及地圖構(gòu)建.mp4" -vn -ar 8000 "F:\mp4\3.TF以及地圖構(gòu)建_201215172919_8k.m4a"
以下是處理過(guò)程輸出信息：
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(qiáng)鍦板浘鏋勫緩.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(qiáng)鍦板浘鏋勫緩_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.轉(zhuǎn)換音頻格式：
命令：ffmpeg -i "源音頻文件" -acodec pcm_s16le -f s16le -ar 目標(biāo)音頻采樣率 "目標(biāo)音頻路徑" 示例：ffmpeg -i "F:\mp4\3.TF以及地圖構(gòu)建_201215172919_8k.m4a" -acodec pcm_s16le -f s16le -ar 8000 "F:\mp4\3.TF以及地圖構(gòu)建_201215172919_8k_201215173520_8k.pcm"
處理過(guò)程輸出信息：
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(qiáng)鍦板浘鏋勫緩_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(qiáng)鍦板浘鏋勫緩_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. 軟件包下載（以上調(diào)用過(guò)程和參數(shù)已經(jīng)封裝處理，軟件目的是調(diào)用百度音頻識(shí)別API將視頻中的音頻轉(zhuǎn)化為文字）
軟件開(kāi)源代碼地址(項(xiàng)目集成文字識(shí)別、語(yǔ)音合成、語(yǔ)音識(shí)別)：https://gitee.com/bidev_admin/river-int-ai.git
運(yùn)行軟件包下載地址(.Net Framework 4.5)： https://pan.baidu.com/s/1z-WFDGHhEP8tqLqwp9I0Mw 提取碼: r3sk
作者：沐汐 Vicky
出處：http://www.cnblogs.com/EasyInvoice
以上就是C# 調(diào)用FFmpeg處理音視頻的示例的詳細(xì)內(nèi)容，更多關(guān)于c# 處理音視頻的資料請(qǐng)關(guān)注腳本之家其它相關(guān)文章！
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