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The patch below provides exactly that to the MP3 muxer. A XING header containing * the numer of frames, * the size, and * a TOC is generated. It's based on an idea by Anton Khirnov (restricted to the number of frames) found at http://patches.ffmpeg.org/patch/1891/ The TOC is generated as found in lame's "VbrTag.c". According to my tests the following reproduces the number of frames, the size and the TOC in "c.mp3" from "b.mp3" (except a shift due to shorter XING header generated by FFmpeg): lame -V2 a.wav b.mp3 ffmpeg -i b.mp3 -acodec copy -y c.mp3
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.