[Libav-user] MJPEG quantization tables

Michael Toon michael.toon at digitalbarriers.com
Wed Jul 15 11:09:30 CEST 2015


I am using the encoder libs to encode MJPEG video which I am packaging up to send via RTP.  The encoded bit stream that I generate only appears to have a single quantization table defined, however the RTP payload format specifies that if using custom quantization tables there should be two separate quantization tables for luma and chroma. Having separate tables seems to make sense to try and gain most encoding efficiency, especially since I need to transmit two tables regardless. Is there a reason why the MJPEG codec only generates a single table, is there an option that I can to use separate tables?



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