此种情况wanted_spec.callback=NULL // 2) 音频设备打开后播放静音,不启动回调,调用SDL_PauseAudio(0)后启动回调,开始正常播放音频 wanted_spec.freq = is->p_acodec_ctx->sample_rate; // 采样率 wanted_spec.format = AUDIO_S16SYS; // S表带符号,16是采样深度,SYS表采用系统字节序 wanted_spec.chann...
$ ffmpeg -i test.mp4 -t 10 -r 1 -f image2 pic-%03d.jpeg # 截取一张352x240尺寸大小的,格式为jpg的图片 $ ffmpeg -i test.asf -y -f image2 -t 0.001 -s 352x240 a.jpg # 把视频的前30帧转换成一个Animated Gif $ ffmpeg -i test.asf -vframes 30 -y -f gif a.gif # 截取指定时...
I created small video editing tool with which you can put some overlay images to the video and show them at specific locations and durations (filter: overlay=enabled(from, to...), etc.). Now I also want to add some short audio sounds on the same way like pictures -> adding them to...
ffmpeg -f dshow -i video="USB 2861 Device" -f dshow -i audio="线路 (3- USB Audio Device)" -vcodec libx264 -acodec aac -strict -2 mycamera.mkv 上面的命令行用video=指定视频设备,用audio=指定音频设备,后面的参数是定义编码器的格式和属性,输出为一个名为mycamera.mkv的文件。 命令运行之后,...
参数解释： 500:500 画布的尺寸 . (w:h) 100:100 视频帧在画布里的尺寸--按比例缩放的. ...
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc58.54 转换封装格式 $ ffmpeg -i cctv1.flv -vn -acodec aac cctv1.aac $ffprobe cctv1.flv Input #0, flv, from 'cctv1.flv': Metadata: encoder : Lavf58.20.100 ...
FFmpegis a cross-platform solution to record, convert and edit audio and video. It is a command line tool to convert one video file format to another. However, you could also find a FFmpeg GUI for user-friendly video editing. In this article, we will show you how to use FFmpeg for da...
ffmpeg -f dshow -i video=“UScreenCapture”:audio=“Microphone” output.flv 如果你想获得正在从扬声器播放的音频,需要配置 “Stereo Mix” 设备 或者 ffmpeg -f dshow -i video=“UScreenCapture” -f dshow -i audio=“Microphone” output.flv ...
AVMEDIA_TYPE_VIDEO, // 视频数据信息 AVMEDIA_TYPE_AUDIO, // 音频数据信息 AVMEDIA_TYPE_DATA, //通常是连续的不透明的数据信息 AVMEDIA_TYPE_SUBTITLE, // 子标题数据信息 AVMEDIA_TYPE_ATTACHMENT, //通常是稀疏的不透明的数据信息 (字幕等)
A = Audio input/output V = Video input/output N = Dynamic number and/or type of input/output | = Source or sink filter 1. 2. 3. 4. 5. 6. 7. 8. 9. pix_fmts:显示可用的像素格式 E:\音视频\test-av>ffmpeg -pix_fmts Pixel formats: ...