[Bug] cpb_cnt_minus1 out of range from AVC streams ? [sf#264]

[rbouqueau]

Reported by kurtnoise13 on 2013-01-11 08:22 UTC Hi,

It seems that MP4Box allows cpb_cnt_minus1 values > 31 when we mux AVC streams. According to the specs, only 0-31 range is legal. Is it really a bug ?

More informations & samples from here : http://forum.doom9.org/showthread.php?p=1610245\#post1610245

[rbouqueau]

Commented by rbouqueau on 2013-01-11 11:30 UTC Hi Kurtnoise,

Thanks for reporting.

The file is definitely corrupted (I also tried with another non-free tool). I have a patch, to display a message when the value is not in range.

Did you have access to the raw h264? We would need to check its compliance.

Romain

[rbouqueau]

Commented by selur on 2013-01-11 14:01 UTC Since I don't have the raw any more here's what I do to create these files:

a. extract audio ffmpeg -y -threads 8 -i "D:\VTS_01_VOBID_003_1.VOB" -vn -t 30 -acodec copy "H:\Output\iId_2_aid_128DELAY-161ms_14_46_20_8610_01.ac3"

b. run delay cut over audio (mp4box otherwise sometimes doesn't like ffmpeg extracted audio) delaycut -o "H:\Output\iId_2_aid_128DELAY-161ms_14_46_20_8610_02.ac3" -i "H:\Output\iId_2_aid_128DELAY-161ms_14_46_20_8610_01.ac3"

c. run DGIndex on the source "G:\Hybrid\avisynthPlugins\DGIndex.exe" -om 0 -i "D:\VTS_01~1.VOB" -o "H:\Output\17421089814_46_20_8610" -hide -exit

d. generate an Avisynth script:

SetMemoryMax(768) SetMTMode(5,8) LoadPlugin("G:\Hybrid\avisynthPlugins\LoadDll.dll") LoadDll("G:\Hybrid\avisynthPlugins\libfftw3f-3.dll") LoadDll("G:\Hybrid\avisynthPlugins\fftw3.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\Average.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\TIVTC.dll") LoadCPlugin("G:\Hybrid\avisynthPlugins\yadif.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\ffms2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\VerticalCleanerSSE2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\TDeint.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\SSE2Tools.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\RepairSSE2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\RemoveGrainSSE2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\nnedi3.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\nnedi2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\nnedi.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\mvtools2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\mt_masktools-26.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\FFT3DFilter.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\eedi3.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\EEDI2.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\DirectShowSource.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\dfttest.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\AddGrainC.dll") LoadPlugin("G:\Hybrid\avisynthPlugins\DGDecode.dll") Import("G:/Hybrid\avisynthPlugins\QTGMC-3.33.avsi") Import("G:/Hybrid\avisynthPlugins\Srestore.avsi") MPEG2Source(d2v="H:\Temp\17421089814_46_20_8610.d2v") SetMTMode(2) ConvertToYv12(interlaced=true, matrix="PC.709") AssumeTFF() QTGMC(Preset="Fast") srestore(frate=25,omode=6,speed=9,mode=2,thresh=16,cache=-1) Crop(0,0,718,480) Spline16Resize(704,576) distributor() return(last)

e. feed the Avisynth script through mencoder to x264 mencoder -endpos 30 -lavdopts threads=8 -really-quiet -of rawvideo -o - -ovc raw -noskip -vf scale,format=i420 -forcedsubsonly -nosub -nosound -mc 0 "H:\Output\encodingTempAvisynthSkript_14_46_20_8610.avs" | x264 --preset ultrafast --tune fastdecode --crf 18 --profile high --level 4.1 --sync-lookahead 15 --vbv-maxrate 62500 --vbv-bufsize 78125 --sar 16:11 --colormatrix bt470bg --fps 25 --input-res 704x576 --output "H:\Output\14_46_20_8610_05.264" -

f. rename ac3 file: from frH:\Output\iId_2_aid_128DELAY-161ms_14_46_20_8610_02.ac3 to H:\Output\iId_2_aid_128DELAY-161ms_14_46_20_8610_02_DELAY_161ms.ac3 g. multiplex audio and video using mp4box 0.5.1 rev4277 (same happens with all nightls build currently available) MP4Box -par 1=16:11 -add "H:\Output\14_46_20_8610_05.264"#video:fps=25:delay=161 -brand avc1 -add "H:\Output\iId_2_aid_128DELAY-161ms_14_46_20_8610_02_DELAY_161ms.ac3"#audio:lang= -itags tool="Hybrid 2013.01.06.1" -tmp "H:\Output" -new "H:\Output\14_46_20_8610_07.mp4"

g. rename mp4 file: H:\Output\14_46_20_8610_07.mp4 ### H:\Output\sample.mp4

uloaded the raw x264, the avisynth script, the audio and the muxed file all to my google dirve and shared it: https://docs.google.com/file/d/0B\_WxUS1XGCPAQ3A2QlY1bk0ycXM/edit should be available to anyone with the link.

---

Some side notes, that might be interesting or not:

VLC 2.0.1 and all mplayer versions I could get my hands on can't playback the file VLC 2.0.5 no playback problem MPC-HC can't playback the file MPC-HC with LAV Filters no playback problem (that is why it took me so long to detect the problem) DGDecNV can't handle the file ffmpegsource2 can't handle the file

Cu Selur

[rbouqueau]

Commented by rbouqueau on 2013-01-11 15:15 UTC Thanks for the files. It should be fixed as of rev 4279. You can get the installer from http://gpac.wp.mines-telecom.fr/downloads/gpac-nightly-builds/ (in a few minutes).

Tell us if it works so we can close the ticket.

Thanks,

Romain

[rbouqueau]

Commented by selur on 2013-01-11 15:45 UTC did three small test encodes and all seem to be fine. So from the looks of it the bug is fixed.

[rbouqueau]

Updated by rbouqueau on 2013-01-11 15:57 UTC

• status: open --> closed