ffv1.mkv preset no longer works, file encodes but crash cingg on reimport.

ffmpeg itself behaves .. strange

ffmpeg -i zeldaHQ.flv  -c:v ffv1 -default_mode 0 -frames 100 mkv_tedt.mkv -loglevel debug

only muxes 3 frames?

[matroska @ 0xb400007a8916a870] stream 1 end duration = 336                                       

 [AVIOContext @ 0xb400007a59164790] Statistics: 33361 bytes written, 0 seeks, 1 writeouts           [out#0/matroska @ 0xb400007a39163010] Output file #0 (mkv_tedt.mkv):                               [out#0/matroska @ 0xb400007a39163010]   Output stream #0:0 (video): 3 frames encoded; 3 packets muxed (27141 bytes);                                                                                 

 [out#0/matroska @ 0xb400007a39163010]   Output stream #0:1 (audio): 112 frames encoded (7147 samples); 19 packets muxed (1905 bytes);       

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but same command with -an (no audio) muxes all 100 frames ?!

vp8/vp9/theora mkv profiles seems to be unaffected