Single-Pass vs Two-Pass VBR

Two commonly used methods within VBR encoding are VBR 1 pass and VBR 2 pass. VBR 1 pass encoding is a single pass method where the encoding software analyzes the entire file as it encodes. It estimates the target bit rate based on the complexity of the co

本文探讨了视频文件如何在保持高质量的同时减小文件大小。 关键在于选择合适的编码器如H.264或H.265，调整位元流量，以及采用VBR（可变比特率）而非CBR（恒定比特率）。 特别强调了VBR的两种模式：1-Pass和2-Pass，后者通过两次编码过程实现更精细的压缩效果。

Variable bitrate (VBR) is a term used in telecommunications and computing that relates to the bitrate used in sound or video encoding. As opposed to constant bitrate (CBR), VBR files vary the amount of output data per time segment. VBR allows a higher bit

VBR (Variable bitrate)意即可變動的壓縮位元率，在使用VBR 1-pass時，會照當前的影格下去分析可能投入多少資源來壓縮較恰當，以最終不超過指定容量限制為主。

This study compares output quality and encoding time for single-pass and two-pass VBR encoding for 2-minute files, ten-minute files, and feature-length movies.