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MKV to MP4 conversions missing 1/3 of video

AdvocateOfNyx
By AdvocateOfNyx
in Troubleshooting
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Hey, I'm not 100% sure if this is the right place to post this so if this is wrong I apologize.

 

Essentially, I was recording a podcast in OBS and 30 minutes in the video crashed and I got an encoder error.  No big deal because I was recording in MKV so the entire video saved.  I switched the encoder and recorded the other half an hour of the podcast.  However, I can't use MKV files in Premiere, so I converted them to mp4 files in VLC.  Unfortunately, the first half of the video was missing the last 10 minutes of video and audio capture.  I tried again in XMedia Recode, but they both have the exact same cutoff - 21:07 - when they should keep going until 30:11.

 

Anyone have any idea how to fix this?  I can't import the raw MKV file into Premiere and it seems like the converters can't access the last 10 minutes even though I can play it back on my computer locally just fine.  The only idea I can think of is to capture my VLC in OBS and re-record the video as I play it back, but I'm not sure if that's a good option.

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Posted

Try encoding with Handbrake?  

 

Does the mkv fully play past 21:07?  

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46 minutes ago, tkitch said:

Try encoding with Handbrake?  

 

Does the mkv fully play past 21:07?  

I tried Handbrake as soon as I posted here because I remembered that's what I used to use and it had the exact same issue, stopped at 21:07.

 

Yeah, the original MKV plays all the way through with no issues in VLC.

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Posted

Get mediainfo and see what it says.

 

Another tool I use is MKVToolnix which can be used to edit MKV files and add or extract the video/audio/subtitle tracks. There could be some flag set to end playback at 21:07 even though the tracks are longer. Extracting the tracks and recombining them into a fresh MKV or MP4 or whatever might work.

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28 minutes ago, Hairless Monkey Boy said:

Get mediainfo and see what it says.

 

Another tool I use is MKVToolnix which can be used to edit MKV files and add or extract the video/audio/subtitle tracks. There could be some flag set to end playback at 21:07 even though the tracks are longer. Extracting the tracks and recombining them into a fresh MKV or MP4 or whatever might work.

Okay, I got Mediainfo downloaded and ran it through.  Will also give MKVToolnix a try.  I'm not 100% sure how to read what it's telling me, but the duration of the video is correctly labeled at 30 minutes.  Here is the log file:

 

Edit - When I extracted the video and audio with gMKV, the audio played fine but the video would not open.  The icon for the file was a blank white icon.  I thought this could be because I haven't purchased the $0.99 HEVC extension for Windows, but VLC has the HEVC plugin installed and it still won't open. 

General
Unique ID                                : 164121945552547912098465822792757741662 (0x7B78BCA8903F3CEFBEE47FCF5BE3085E)
Complete name                            : D:\Podcast Episode 1\2023-01-08 22-50-05.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 2.15 GiB
Duration                                 : 30 min 11 s
Overall bit rate                         : 10.2 Mb/s
Writing application                      : Lavf59.27.100
Writing library                          : Lavf59.27.100
ErrorDetectionType                       : Per level 1

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L6.2@Main
Codec ID                                 : V_MPEGH/ISO/HEVC
Duration                                 : 30 min 11 s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Default                                  : No
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                                 : 30 min 11 s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Title                                    : Track1
Default                                  : No
Forced                                   : No

 

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29 minutes ago, Hairless Monkey Boy said:

Get mediainfo and see what it says.

 

Another tool I use is MKVToolnix which can be used to edit MKV files and add or extract the video/audio/subtitle tracks. There could be some flag set to end playback at 21:07 even though the tracks are longer. Extracting the tracks and recombining them into a fresh MKV or MP4 or whatever might work.

Decided to start a new comment because my old one was getting kinda crowded.  I went through the MKVToolnix logs and found an error, so I will put that here too.

  

[2023-01-09][14:39:44] #GUI#progress 68%
[2023-01-09][14:39:44] #GUI#progress 69%
[2023-01-09][14:39:44] #GUI#warning D:\Podcast Episode 1\2023-01-08 22-50-05.mkv: Error in the Matroska file structure at position 1612075931. Resyncing to the next level 1 element.
[2023-01-09][14:39:44] #GUI#warning The last timestamp processed before the error was encountered was 00:21:07.667000000.
[2023-01-09][14:39:54] #GUI#warning Still resyncing at position 2168964457.
[2023-01-09][14:39:57] #GUI#warning Resync failed: no valid Matroska level 1 element found.
[2023-01-09][14:39:57] #GUI#progress 100%
[2023-01-09][14:39:57] Exit code: 1

 

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