1 How to reduce video size using node ffmpeg 1 How to reduce output file size with ffmpeg? 0 Reduce file size of ffmpeg converted video 1 decreasing video resolution using ffmpeg increases file size 0 Make a video 10h long while keeping it lightweight in filesize 3 Reduce bitrate of...
Reduce fluctuations in QP (before curve compression) [20.0] –qblur (x264) -qblur (FFmpeg) Reduce fluctuations in QP (after curve compression) [0.5] –zones /(x264) UNKNOWN (FFmpeg) Allows setting a specific quantizer for a specific region of video. –qpfile (x264) UNKNOWN (FFmpeg) Al...
通过av_reduce计算得到,PAR * SAR = DAR,其中 PAR 是 Pixel Aspect Ratio,表示单个像素的宽高比,大多数情况像素宽高比为 1:1,也就是一个正方形像素,如果不是 1:1,则该像素可以理解为长方形像素。 pix_fmt:像素格式,对应av_get_pix_fmt_name(AVStream->codecpar->format)。 level:编码参数,对应AVStream-...
$ ffplay -f <文件格式> -pixel_format <像素格式> -video_size <视频尺寸> -i <文件路径> 其中,-pixel_format 表示像素格式,可以用 ffplay -pix_fmts 命令开查看当前支持的格式。示例:$ ffplay -f rawvideo -pixel_format yuv420p -video_size 1280x720 -i input.yuv ...
Reduce fluctuations in QP (before curve compression) [20.0] –qblur (x264) -qblur (FFmpeg) Reduce fluctuations in QP (after curve compression) [0.5] –zones /(x264) UNKNOWN (FFmpeg) Allows setting a specific quantizer for a specific region of video. ...
// 通过av_reduce计算得到,par * sar = dar display_aspect_ratio=16:9 // 像素格式,即av_get_pix_fmt_name(AVStream->codecpar->format) pix_fmt=yuvj420p // 编码参数,即AVStream->codecpar->level level=40 // 额外的色彩空间特征,即av_color_range_name(AVStream->codecpar->color_range),AVCO...
av_reduce(&dar.num, &dar.den, par->width * sar.num, par->height * sar.den, 1024*1024); 查看音视频文件的数据包信息 // -select_streams表示选择音频或者视频 ffprobe -show_format [-select_streams audio | video] inputFile 首先看下视频流的第一个Packet和第二个Packet: ...
int origin_width=video_decode_ctx->width;int origin_height=video_decode_ctx->height;AVRational aspect_ratio=src_video->codecpar->sample_aspect_ratio;AVRational display_aspect_ratio;av_reduce(&display_aspect_ratio.num,&display_aspect_ratio.den,origin_width*aspect_ratio.num,origin_height*aspect_rati...
从事音视频开发的程序员几乎都应该知道或使用过 FFmpeg。FFmpeg 是一个开源软件,采用 LGPL 或 GPL 许可证(需要注意这里的开源协议,它具有『传染性』,会要求它的使用方也开源)。我们可以使用 FFmpeg 来进行多种格式音频和视频的录制、转换、流处理功能。
>avctx_inited) { int orig_w = st->codecpar->width; int orig_h = st->codecpar->height; ret = avcodec_parameters_from_context(st->codecpar, st->internal->avctx); if (ret < 0) goto find_stream_info_err; #if FF_API_LOWRES // The decoder might reduce the video size by the ...