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To give you a good idea of what a usual FFmpeg command line looks like, here is an overview:įfmpeg -ss starttime -i inputfile -t length -c:v videocodec other encoding options outputfile Seekingįirst, we need to know how we can only encode a certain part of the video, or in other words, "cut" it. Target Bitrate: A bitrate which the encoder aims to reach as its overall average bitrate, but may over- or undershoot to guarantee a constant quality.Constant Quality Mode: An encoding mode which uses a Constant Rate Factor to aim to encode each frame with a similar quality.without sudden "bitrate spikes" in difficult segments, which is important for streaming.
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This is a form of VBR which remains somewhat predictable, i.e. Average Bitrate (ABR): A bitrate which, averaged over a certain time segment, meets a target bitrate.Constant Bitrate (CBR): A bitrate which is remains the same over the entire span of the video, resulting in a predictable filesize but no flexibility for the encoder when it comes to how it wishes to allocate the bitrate.Variable Bitrate (VBR): A bitrate which varies depending on the content of the video over time, using less for easier to compress video, and more for harder to compress segments.Bitrate: The rate of information (bits) that a video stream contains.If you're in a hurry, skip this section and venture ahead, and only look back on it as a reference if a word comes up that you don't understand. 4.5 A Note about Multi-Threaded EncodingĪ few expressions need to be expanded upon as this article will be making use of them.