Strange Behaviour for a mkv file

[spbisc97]

I tried to use this on a mkv file of 1h and the script created a 192h smaller file

The bigger file seems to do strange jumps from a point to another while watching it

$ mediainfo 2020-11-04.mkv (__Original fIle__)
General
Unique ID                                : 320983083349980904216325639691054698819 (0xF17B17DB12D4BE27E2188CEF9B755143)
Complete name                            : 2020-11-04.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 367 MiB
Duration                                 : 1 h 12 min
Overall bit rate                         : 703 kb/s
Writing application                      : Lavf58.29.100
Writing library                          : Lavf58.29.100
ErrorDetectionType                       : Per level 1

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 1 h 12 min
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Writing library                          : x264 core 157 r2945 72db437
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=6 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : A_AAC-2
Duration                                 : 1 h 12 min
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Title                                    : simple_aac_recording
Default                                  : Yes
Forced                                   : No

And this created a file smaller (right) but with a lenght of 192h (also vlc and mediainfo shows this lenght )

this are the info about the modified file!

mediainfo 2020-11-04_22-20-9.mkv (__script applied file__)
General
Unique ID                                : 32342141967383299756911926598104612617 (0x1854DEB63A1119FC2BF4DA039C717F09)
Complete name                            : 2020-11-04_22-20-9.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 273 MiB
Duration                                 : 192 h
Overall bit rate mode                    : Variable
Overall bit rate                         : 3 310 b/s
Writing application                      : Lavf58.45.100
Writing library                          : Lavf58.45.100
ErrorDetectionType                       : Per level 1

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Writing library                          : x264 core 160 r3011 cde9a93
Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Default                                  : Yes
Forced                                   : No
DURATION                                 : 192:06:06.506000000

Audio
ID                                       : 2
Format                                   : Vorbis
Format settings, Floor                   : 1
Codec ID                                 : A_VORBIS
Duration                                 : 192 h
Bit rate mode                            : Variable
Bit rate                                 : 112 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Compression mode                         : Lossy
Stream size                              : 9.02 GiB
Title                                    : simple_aac_recording
Writing application                      : Lavc58.91.100
Writing library                          : libVorbis (Reducing Environment) (20200704 (Reducing Environment))
Default                                  : Yes
Forced                                   : No
DURATION                                 : 192:06:06.520000000

thank you so much for your work!!

[spbisc97]

This strange behavior repeated with all mkv files, but if i just copy this to mp4 (container?) this works
and this copy takes only a fiew seconds

ffmpeg -i fileName.mkv -c copy fileName.mp4

and then

./simple_ehm-runnable.py fileName.mp4

thanks, i hope this can also be useful

[morrolinux]

Hi What ffmpeg version are you using? Il dom 3 gen 2021, 17:38 Simone Rotondi <notifications@github.com> ha scritto:

…

This strange behavior repeated with all mkv files, but if i just copy this to mp4 (container?) this works and this copy takes only a fiew seconds ffmpeg -i fileName.mkv -c copy fileName.mp4 and then ./simple_ehm-runnable.py fileName.mp4 thanks, i hope this can also be useful — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#7 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE22U3Q67FCH4PKI33WIYKTSYCMPLANCNFSM4VRLUUMQ> .

[spbisc97]

ffmpeg version 4.3.1-4ubuntu1

on Kubuntu 20.10

[morrolinux]

I'm observing a strange behaviour on mkv files, it's probably due to some ffmpeg option that work different on this container and I don't know of.
This could be investigated further.. or maybe I'll just force the mp4 container, IDK

[spbisc97]

A little time ago made an error also by using the mp4 container, but sorry I didn't have enough time to check better the error. Anyway just re-encoding before applying simple-ehm fixed the error.
Thanks again for this beautiful piece of Art!

[bleo181-dev]

Hi everyone, I have the same problem with .MKV files
To solve it first I manually convert the videos to .MP4 with an external program (Video to Video on Windows 10) then I can finally use the program.
If this .MKV to .MP4 conversion could be automated it would be perfect

[Guray00]

Hi, i made an update in my fork because i had the same issue, can you please check if works? (in my case the answer is yes)
https://github.com/Guray00/simple-ehm/tree/fix_cut

[bleo181-dev]

@Guray00 I tried your version on a .mkv video and now it finally generates a consistent video.
I appreciated the more user-friendly updated readme.
Despite being a command line tool a GUI would be appreciated or at least a sort of prompt that guides the user step-by-step to insert the video input and maybe even the destination output folder plus all the options already present and that you introduced about renaming. Bravo

[luca-morellini]

@Guray00 It works!