M2VRequantiser in Launchpad

M2VRequantiser

Registered 2010-07-23 by Martin Wimpress 

Requantize MPEG-2 streams without recompressing. M2VRequantiser accepts raw MPEG2 video data (not VOB) from standard input and writes the recompressed frames to standard output.

I discovered that 'tcrequant' (part of the transcode suite of tools) has been deprecated and that when I ran 'tcrequant' on my 64-bit Ubuntu workstation is was corrupting the video. See the links below for details.

- http://tcforge.berlios.de/archives/2009/01/18/transcode_1_1_0_final_release/index.html
- http://www.mail-archive.com/transcode-users@exit1.org/msg01773.html

Therefore I decided to get the M2VRequantiser code from Metakine working on both 32-bit and 64-bit Linux as a replacement for 'tcrequant'.

M2VRequantiser takes two arguments. The first one is a floating point value specifying the ratio of compression. The second is the size of the M2V, since the data is streamed to M2VRequantiser it cannot know the M2V size. The following command would recompress 'original.m2v', whose size is 1024000 bytes, by a factor of 1.25.

M2VRequantiser 1.25 1024000 < original.m2v > requantised.m2v