分辨率(Resolution):分辨率指的是视频图像的像素数量,通常以宽度×高度的形式表示。常见的分辨率有720p、1080p(Full HD)、4K等。 编解码器(Codec):视频编解码器用于将视频信号压缩以减小文件大小或传输带宽。常见的视频编解码器有H.264、H.265(HEVC)、VP9等。 关键帧(Keyframe):关键帧是视频序列中的特殊帧,它...
举个例子,一个显示顺序为 P[1]b[1]b[2]B[3]b[4]b[5]P[2] 的小画面组(minigop),其中的B帧还被其它b帧用作参考,而b帧不被任何帧参考,因为称为“一次性”。当b-pyramid开启时,中间的B[3]帧将在P帧之后,b帧之前被编码,因为它是后续两个b帧的参考。P[1]将是b[1]和b[2]的L0(过去)参考,...
maximum allowed resolution, you canusethistolimit the output videotothat,whileretaining the aspect ratio. For example, device A allows1280x720 playback,andyour video is1920x800. Using this option (setittodecrease)andspecifying1280x720tothe command line makes the output1280x533. Please note that ...
What? the act of converting from one resolution to another one. As said before transsizing is often used with transrating.Why? reasons are about the same as for the transrating.How? converting a 1080p to a 480p resolution.$ ffmpeg \ -i bunny_1080p_60fps.mp4 \ -vf scale=480:-1 \...
1. How to compress video with FFmpeg? To compress a video, you can use FFmpeg to trim its length, change the format, adjust the resolution, bitrate, or modify the frame rate. In this article, we’ve provided a variety of compression commands that you can easily copy and execute to get...
out1.mkv is a Matroska container file and accepts video, audio and subtitle streams, so ffmpeg will try to select one of each type. For video, it will select stream 0 from B.mp4, which has the highest resolution among all the input video streams. For audio, it will select stream 3 ...
such as resolution, bit rate, frame rate, encoding quality, and more. These parameter settings can be customized based on users' needs to meet different video encoding scenarios and device requirements. Additionally, the AMD AMF Encoder supports multiple encoding formats, including H.264, H.265,...
When you execute this command, you will begin an x264 live stream at 480p resolution (downscaled from 1080p HD) at 1600 kbps bitrate, with a 900kb buffer. Important Notes about FFmpeg Live Streaming Here are some other things to keep in mind when live streaming with FFmpeg: You should ...
compress ="ffmpeg -i {} -b:v {}k -bufsize {}k -vf scale={} -minrate {}k -pix_fmt yuv420p -vcodec libx264 -preset veryslow -profile:v baseline -crf 23 {}".format(self.fileInputPath, self.bitrate, self.bitrate, self.resolution, int(self.bitrate) + 100, self.fileOutPath) ...
out1.mkv is a Matroska container file and accepts video, audio and subtitle streams, so ffmpeg will try to select one of each type.For video, it will select "stream 0" from B.mp4, which has the highest resolution among all the input video streams.For audio, it will select "stream 3...