id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
196	Enc/Dec mismatch for Inter MTS in class F	chollmann		"Encoder/decoder mismatch for class F random access if MTS is enabled for inter when using parallel encoding.

Example: SlideEdit, QP22
When encoding part 7 (33 frames starting at #224) the resulting values for the I-frame #224 are: 
    653360 bits [Y 50.7612 dB    U 48.0983 dB    V 48.3139 dB]
When running a single thread encoding the resulting values for the same I-frame #224 are:
    654320 bits [Y 50.7300 dB    U 48.1538 dB    V 48.3735 dB]

Following frames are affected and differ until the next I-frame (#256) is reached. This frame is identical for both encodings (as well as an encode of only part 8 starting at frame #256) and subsequent frames are identical.
Doing a partial encode for parts 6 and 7 (65 frames starting at #192) yields identical results to the corresponding frames of the complete encoding. 

Similar mismatches can be found in other class F sequences (ArenaOfValor, BasketballDrillText).

Binaries are based on VTM-4.0 (commit 20671d8e).

Commands:
Only part 7:
bin/EncoderAppStatic_VTM-4.0 -c cfg/encoder_randomaccess_vtm.cfg -c cfg/per-class/classF.cfg -c cfg/per-sequence/SlideEditing.cfg -i SlideEditing_1280x720_30.yuv -b SlideEdit7.bin -o SlideEdit7_rec.yuv -q 22 --MTS=3 -fs 224 -f 33

Entire sequence:
bin/EncoderAppStatic_VTM-4.0 -c cfg/encoder_randomaccess_vtm.cfg -c cfg/per-class/classF.cfg -c cfg/per-sequence/SlideEditing.cfg -i SlideEditing_1280x720_30.yuv -b SlideEdit.bin -o SlideEdit_rec.yuv -q 22 --MTS=3 

Attached files:
logs for part 7 of SlideEdit and full sequence"	defect	closed	minor	VTM-4.0.1	VTM	VTM-4.0	fixed	MTS, RA	ksuehring XiangLi fbossen jvet@…