这条命令将输入视频的颜色范围从全范围(0-255)转换为电视范围(16-235)。这里的scale滤镜用于调整颜色范围,in_range指定输入范围,out_range指定输出范围。 示例代码 以下是一个完整的FFMPEG命令示例,用于将视频的颜色范围从全范围转换为电视范围,并同时调整分辨率和帧率: ...
接着,我们进入第三步和第四步:我们必须将视频转码为多种码率,正如 ABR 技术常做的那样。 记住,我们已经将视频调整为所需的分辨率并存储进 [v1out]、[v2out] 和 [v3out] 的输出。我们将直接使用它们作为转码步骤的输入。 -map [v1out] -c:v:0 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -...
out.wav 捕获的音频数据保存的文件名称-f 是指定音频驱动类型。alsa是linux下音频驱动框架。 oss是另外一种音频框架。-ar<freq>设置音频采样率,以HZ为单位-ac<channels>设置音频通道数(单声道、双声道)(2)# ffmpeg-f alsa-ac1-ar44100-idefault-t30out.wav参数介绍:-t30表示录制30秒就自动停止(3)# ffmpeg-...
[out#0/h264 @ 00000210a5c456c0] video:2835kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.018602% frame= 744 fps=0.0 q=-1.0 Lsize= 2835kB time=00:00:30.90 bitrate= 751.5kbits/s speed= 268x 2、提取pcm数据 ffmpeg -i D:/ffmpeg_command_test/001.mp4...
{ /* wait 10 ms */ SDL_LockMutex(wait_mutex); SDL_CondWaitTimeout(is->continue_read_thread, wait_mutex, 10); SDL_UnlockMutex(wait_mutex); continue; } // 4.1 从输入文件中读取一个packet ret = av_read_frame(is->p_fmt_ctx, pkt); if (ret < 0) { if ((ret == AVERROR_EOF)...
AVFrameSideData **side_data;intnb_side_data;#defineAV_FRAME_FLAG_CORRUPT (1 << 0)#defineAV_FRAME_FLAG_KEY (1 << 1)#defineAV_FRAME_FLAG_DISCARD (1 << 2)#defineAV_FRAME_FLAG_INTERLACED (1 << 3)#defineAV_FRAME_FLAG_TOP_FIELD_FIRST (1 << 4)intflags;enumAVColorRangecolor_range...
16.17 setrange 16.18 settb, asettb 16.19 showcqt(将输入音频转换为代表频谱的视频输出) ffplay -f lavfi "amovie=ca.mp3, asplit [a][out1]; [a] showcqt [out0]" ffplay -f lavfi "aevalsrc=0.1sin(2PI55t)+0.1sin(4PI55t)+0.1sin(6PI55t)+0.1sin(8PI55t),asplit[a][out1]; [a] ...
#0 nppscale_deinterleave (ctx=ctx@entry=0x3f51a80, stage=stage@entry=0x3e836c8, out=0x3f64cc0, in=0x3f67c00) at libavfilter/vf_scale_npp.c:389 #1 0x00000000005c7840 in nppscale_scale (in=0x3f67c00, out=0x3f67e80, ctx=0x3f51a80) at libavfilter/vf_scale_npp.c:477 //执行npp...
In addition to the above, this release has had a lot of important internal work done. By far, the standout internally are the improvements made for full-range images. Previously, color range data had two paths, no negotiation, and was unreliably forwarded to filters, encoders, muxers. Wo...
上次已经提到了记得要加-vf scale=out_color_matrix=bt709来保证输出的YUV是BT.709的,那么full range怎么处理?我网上搜了下意外地发现相关信息相当少,一开始搜到一个什么-color_range 2(这个参数ffmpeg的documentation根本没提到啊喂),后来发现效果其实就是强行在元数据里塞个full range,结果视频的像素数值还都是...