-audio_device_index <int> .D... select audio device by index for devices with same name (starts at 0) (from -1 to INT_MAX) (default -1) -pixel_format <pix_fmt> .D... set pixel format (default yuv420p) -framerate .D... set frame rate (default "ntsc") -video_size <imag...
FFmpeg命令行工具学习(四):FFmpeg 采集设备 在使用 FFmpeg 作为编码器时,可以使用FFmpeg采集本地的音视频采集设备的数据,然后进行编码、封装、传输等操作。 例如,我们可以采集摄像头的图像作为视频,采集麦克风的数据作为音频,然后对采集的音视频数据进行编码,最后将编码后的数据封装成多媒体文件或者作为音视频流发送到服...
av_opt_set_pixel_fmt(ctx, "dst_format", out.format, 0); av_opt_set_int(ctx, "sws_flags", SWS_BILINEAR, 0); if (sws_init_context(ctx, nullptr, nullptr) < 0) { // sws_freeContext(ctx); goto end; } 3、创建输入输出缓冲区 首先我们创建需要的局部变量: // 输入/输出缓冲区,元素...
av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n"); goto end; } #endif // 1. end // 2. 将filters_descr描述的滤镜图添加到fctx->filter_graph滤镜图中 /* * Set the endpoints for the filter graph. The filter_graph will * be linked to the graph described by filters_de...
device by index for devices with same name(starts at 0)(from -1 to INT_MAX)(default -1)-pixel_format <pix_fmt> .D... set pixel format(default yuv420p)-framerate .D... set frame rate(default"ntsc")-video_size <image_size> .D... set video size -capture_cursor <boolean> .D...
-pix_fmt yuv420p(pixel format:设置生成视频的颜色通道:yuv NV RGB 可使用ffmpeg -pix_fmts查询相关) -vcodec libx264 (选择设置视频编码器的指令) -proset medium (编码器预设,对编码器工作性能的设定,等级越高性能越好:ultrafast superfast veryfast faster fast medium slow slower veryslow placebo 默认是med...
-timecode hh:mm:ss[:;.]ff set initial TimeCode value. -pass n select the pass number (1 to 3) -vf filter_graph set video filters -b bitrate video bitrate (please use -b:v) -dn disable data Advanced Video options: -pix_fmt format set pixel format ...
format, etc.** Applications must not normally access the link structure directly.* Use the buffersrc and buffersink API instead.* In the future, access to the header may be reserved for filters* implementation.*/struct AVFilterLink {AVFilterContext *src; ///< source filterAVFilterPad *srcpad...
-pix_fmt format set pixel format, 'list' as argument shows all the pixel formats supported -intra 仅适用帧内编码 -qscale q 以<数值>质量为基础的VBR,取值0.01-255,约小质量越好 -loop_input 设置输入流的循环数(目前只对图像有效) -loop_output 设置输出视频的循环数,比如输出gif时设为0表示无限循环...
-bits_per_raw_sample number set the number of bits per raw sample -vol volume change audio volume (256=normal)Per-file main options: 主选项 -f fmt force format 文件格式 -c codec codec name 编码名称 -codec codec codec name -pre preset preset name -map_metadata outfile[,...