[x264-devel] bug report: MB-tree frametype x doesn't match actual frametype y.

[M. S.]

Hi, this is a bug report for x264. If this is the wrong place to post 
it, then please ignore it and point me to the right location. Thanks!

When I do 2-pass DVD recodes with x264, I often encounter this error: 
x264 aborts the second pass at the beginning and reports that "MB-tree 
frametype (whatever number) doesn't match actual frametype (whatever 
number)". You find more info on a recent case below, together with the 
AviSynth and MS-DOS (actually Win XP SP3) scripts used.

Obviously the two passes produce different frametypes at locations where 
they should be identical. I have no idea why. But I found a similar bug 
report for x265, which led me to this link:
https://patches.videolan.org/patch/14453/
Maybe this is the or a related source of the problem, but as I said, 
this is beyond my knowledge. I tried several versions of x264 (r2345, 
r2579, r2762) but it seems to depend on the source video.

By the way, I was unable to try r2833, because it terminates at the 
beginning  of pass 1 (when the "status line" comes up: "Encoding frame x 
of y...") without leaving any error message. Maybe this version is no 
longer compatible with old software like Win XP SP3 & Co.?

Best regards, Mike


Here you have
- the error message:
--------------------------------------------------
C:\_ia\v\dvds\start "dummywindow" /b /low /wait 
C:\Portable\x264\2762\x264.exe --bitrate 879 --preset slower --profile 
high --tune film --bluray-compat --vbv-maxrate 15000 --vbv-bufsize 15000 
--level 3.1 --keyint 50 --fake-interlaced --pic-struct --colorprim 
"bt470bg" --transfer "bt470bg" --colormatrix "bt470bg" --fps 25.0 --sar 
16:11 --pass 2 -o C:\_ia\v\dvds\dvds.264 C:\_ia\v\dvds\dvds.avs
avs [ifo]: 720x428p 16:11 @ 25/1 fps (cfr)
x264 [info]: using SAR=16/11
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowCTZ 
SlowAtom SlowPshufb
x264 [info]: profile High, level 3.1
x264 [error]: MB-tree frametype 237 doesn't match actual frametype 0.
x264 [error]: x264_encoder_encode failed

aborted at input frame 2, output frame 0
--------------------------------------------------


- the DOS script used:
--------------------------------------------------
set docdir="C:\_ia\v\dvds"
set h264dir=C:\Portable\x264\2762
set name=dvds
set bitrate=--bitrate 879
rem first pass
start "dummywindow" /b /low /wait %h264dir%\x264.exe %bitrate% --preset 
slower --profile high --tune film --bluray-compat --vbv-maxrate 15000 
--vbv-bufsize 15000 --level 3.1 --keyint 50 --fake-interlaced 
--pic-struct --colorprim "bt470bg" --transfer "bt470bg" --colormatrix 
"bt470bg" --fps 25.0 --sar 16:11 --pass 1 -o %docdir%\%name%.264 
%docdir%\%name%.avs
rem second pass
start "dummywindow" /b /low /wait %h264dir%\x264.exe %bitrate% --preset 
slower --profile high --tune film --bluray-compat --vbv-maxrate 15000 
--vbv-bufsize 15000 --level 3.1 --keyint 50 --fake-interlaced 
--pic-struct --colorprim "bt470bg" --transfer "bt470bg" --colormatrix 
"bt470bg" --fps 25.0 --sar 16:11 --pass 2 -o %docdir%\%name%.264 
%docdir%\%name%.avs
pause
--------------------------------------------------


- the Avisynth script used:
--------------------------------------------------
vifile1="C:\_ia\v\dvds\dvdin.d2v"
LoadPlugin("C:\Programs\AviSynth\plugins\NicAudio.dll")
a1=NicAC3Source("C:\_ia\v\dvds\dvdin T82 3_2ch 384Kbps DELAY 0ms.ac3", 
2, 0)
LoadPlugin("C:\Programs\AviSynth\plugins\DGDecode.dll")
LoadPlugin("C:\Programs\AviSynth\plugins\ColorMatrix.dll")
v1=DGDecode_mpeg2source(vifile1,info=3).ColorMatrix(hints=true)
AudioDub(v1,a1).trim(1550,154750).normalize(0.98).crop(0,74,-0,-74).fadeIn(25).fadeOut(25).limiter() 

loadplugin("C:\Programs\AviSynth\plugins\SoundOut.dll")
soundout(output="wav", filename="C:\_ia\v\dvds\dvdout.wav")
--------------------------------------------------