I recently discovered that ‘tcrequant’ (part of the transcode suite of tools) has been deprecated. Worst still I found that when I ran ‘tcrequant’ on my 64-bit Linux workstation is was corrupting the video. See the links below for details.

• transcode 1.1.0 Final Release
• [transcode-users] tcrequant status

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 accepts the raw MPEG2 video data (not VOB) from the standard input and writes the recompressed frames to the standard output.  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

I’ve only tested on 32-bit and 64-bit Linux, specifically Ubuntu Intrepid 8.10. It works for me but I’d be interested to get your feedback.

• See the Code section of my site for the download and more details.

M2VRequantiser was released on April 23rd 2009 to help celebrate St. George’s Day.