VidCoder hangs during DVD encode while equivalent HandBrakeCLI command completes successfully

[jwblair47]

Problem Description

Summary

VidCoder hangs during DVD folder encodes, producing a short .part.mp4 file and then stopping progress, while an equivalent HandBrakeCLI command using the same source and settings completes successfully.

This regression occurs in VidCoder 12.12 and 12.13. The same workflow worked correctly for me as recently as November 2025.

Environment
- VidCoder versions tested: 12.12, 12.13 (installed and portable)
- HandBrakeCLI version: 1.10.2 (bundled with VidCoder)
- OS: Windows 11 Pro
- CPU: Intel i7-11700K
- GPU: NVIDIA RTX 3080
- Source type: DVD folder (VIDEO_TS) on local disk
- DVD characteristics:
- Not CSS protected
- Region free
- No structural copy protection detected

What worked previously (Nov 2025)
Until November 2025, my normal workflow was:
- Input: DVD folder (not MKV)
- Output: MP4
- Subtitles present (VOBSUB or CC608), off by default
- Preview scan enabled (default 10)
- Hardware decode enabled or disabled (both worked)
VidCoder completed these encodes normally.

Current behavior

1. VidCoder scans the DVD folder successfully.
2. Encoding starts.
3. A .part.mp4 file is created and grows briefly.
4. Encoding stalls/hangs very early (typically after ~10–30 seconds of output).
5. VidCoder UI stops making progress and must be terminated via Task Manager.
6. Resulting .part.mp4 files are short (e.g. 14–34 seconds).
   This occurs:

• With NVDEC enabled or disabled
• With subtitles enabled or disabled
• With previews enabled (default 10)
• On both installed and portable VidCoder
• After deleting/recreating VidCoder.sqlite

Control test: HandBrakeCLI succeeds

Using HandBrakeCLI 1.10.2 directly on the same DVD folder, with settings matching the VidCoder preset as closely as possible (including previews, cropping, filters, and NVDEC), the encode completes successfully.

This demonstrates that:

• The source DVD is readable
• HandBrake itself does not hang
• The failure is specific to VidCoder’s orchestration/worker handling

Working HandBrakeCLI command
HandBrakeCLI ^
-i "C:\Path\To\DVD_Folder" ^
-o "D:\Rip (temp)\MP4s\Output.mp4" ^
--main-feature ^
-f av_mp4 ^
--markers ^
--align-av ^
--previews 10:0 ^
--enable-hw-decoding nvdec ^
--crop-mode custom ^
--crop 56:60:0:0 ^
--comb-detect ^
--decomb ^
--color-matrix 709 ^
-e x264 ^
-q 19 ^
--encoder-preset slow ^
--encoder-profile high ^
--encoder-level 4.1 ^
--encoder-tune film ^
--multi-pass ^
--cfr ^
--encopts colorprim=bt709:transfer=bt709:colormatrix=bt709 ^
-a 1 ^
-E av_aac ^
-B 192 ^
-6 stereo ^
-R 48 ^
--all-subtitles ^
--subtitle-default=none ^
--subtitle-burned=none

This command finishes normally and produces a complete MP4.

Observations

• VidCoder hangs after encoding has begun, not during scan.
• VidCoder produces partial output, indicating the worker starts successfully.
• The same HandBrake build completes when run outside VidCoder.
• The issue appears independent of:
  • NVDEC on/off
  • Subtitles on/off
  • Preview count
• This suggests a VidCoder UI / worker IPC / progress / lifecycle deadlock, not a decoder failure.

Attached files
VidCoder logs (General / Combined / Worker)
Working HandBrakeCLI .cmd file
VidCoder preset (.vjpreset)

Vidcoder Files.zip

Expected behavior
VidCoder should complete the encode successfully, as it did previously, and as HandBrakeCLI still does with the same inputs and settings.

What version of VidCoder are you running?

12.3

Encode Log

VC [00:46:57] VidCoder 12.13
VC [00:46:57] Starting job 1/1
VC [00:46:57]   Source path: C:\Users\jwbla\Desktop\October Sky (1999) 1h48
VC [00:46:57]   Destination path: D:\Rip (temp)\MP4s\October Sky (1999) 1h48 (Q19, BT.709, Stereo).mp4
VC [00:46:57]   Title: 1
VC [00:46:57]   Range: All
VC [00:46:57]   Preset: PROGRESIVE Source (Q19, BT.709, Stereo)
VC [00:46:57]   Picker: Progressive
VC [00:46:57] Worker ready: Pipe 'VidCoderWorker.1bfa8d31-601d-4798-8479-23b1e47c5b01' is open
VC [00:46:57] Connecting to process 10024 on pipe VidCoderWorker.1bfa8d31-601d-4798-8479-23b1e47c5b01
VC [00:46:57] Connecting to named pipe 'VidCoderWorker.1bfa8d31-601d-4798-8479-23b1e47c5b01' on machine '.'
VC [00:46:57] Connected.
VC [00:46:57] Sending Request
  CallId: 1
  MethodName: Ping
VC [00:46:57] Sending message bytes: 0x09000150696E67000000
VC [00:46:57] Reading message with length 8
VC [00:46:57] Received Response
  CallId: 1
  Succeeded: True
  Data: OK
  Response Bytes: 0x224F4B22
VC [00:46:57] Sending Request
  CallId: 2
  MethodName: SetUpWorker
  Parameters:
    2
    10
    True
    10
    1
    <null>
  Serialized Parameters:
    0x32
    0x3130
    0x74727565
    0x3130
    0x31
    0x6E756C6C
VC [00:46:57] Sending message bytes: 0x2400025365745570576F726B65720006013202313004747275650231300131046E756C6C00
VC [00:46:57] Reading message with length 8
VC [00:46:57] Sending Request
  CallId: 3
  MethodName: StartEncode
  Parameters:
    VidCoderCommon.Model.VCJob
    -1
    0
    Chapter {0}
    VidCoderCommon.Model.Job.JobConfiguration
    -1
  Serialized Parameters:
    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
    0x2D31
    0x30
    0x2243686170746572207B307D22
    0x7B22456E61626C65517569636B53796E634465636F64696E67223A747275652C225573655173764465636F6465466F724E6F6E517376456E636F646573223A66616C73652C22456E61626C65517569636B53796E634879706572456E636F6465223A66616C73652C22456E61626C654E56446563223A66616C73652C22456E61626C65446972656374584465636F64696E67223A747275657D
    0x2D31
VC [00:46:57] Sending message bytes: 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
VC [00:46:57] Reading message with length 8
VC [00:46:57] Reading message with length 2659
VC [00:46:57] Received Request
  CallId: 1
  MethodName: OnMessageLogged
  Parameters:
    [00:46:57] thread 3 started ("libhb")
[00:46:57] CPU: 11th Gen Intel(R) Core(TM) i7-11700K @ 3.60GHz
[00:46:57]  - logical processor count: 16
[00:46:57] Intel Quick Sync Video support: no
[00:46:57] hb_scan: path=C:\Users\jwbla\Desktop\October Sky (1999) 1h48, title_index=1
[00:46:57] thread 4 started ("scan")
src/libbluray/disc/disc.c:437: error opening file BDMV\index.bdmv
src/libbluray/disc/disc.c:437: error opening file BDMV\BACKUP\index.bdmv
[00:46:57] bd: not a bd - trying as a stream/file instead
libdvdread: Could not open input:
libdvdread: Can't open C:\Users\jwbla\Desktop\October Sky (1999) 1h48 for reading
libdvdread: Device C:\Users\jwbla\Desktop\October Sky (1999) 1h48 inaccessible, CSS authentication not available.
libdvdnav: Unable to open device file C:\Users\jwbla\Desktop\October Sky (1999) 1h48.
libdvdread: Could not open input:
libdvdread: Can't open C:\Users\jwbla\Desktop\October Sky (1999) 1h48 for reading
libdvdread: Device C:\Users\jwbla\Desktop\October Sky (1999) 1h48 inaccessible, CSS authentication not available.
[00:46:57] scan: DVD has 1 title(s)
[00:46:57] scan: scanning title 1
[00:46:57] scan: duration is 01:47:22 (6442900 ms)
[00:46:57] pgc_id: 1, pgn: 1: pgc: 00000269dc78cb80
[00:46:57] scan: checking audio 1
[00:46:57] scan: id=0x80bd, lang=English (AC3), 3cc=eng ext=1
[00:46:57] scan: checking audio 2
[00:46:57] scan: id=0x81bd, lang=Francais (AC3), 3cc=fra ext=1
[00:46:57] scan: checking subtitle 1
[00:46:57] scan: id=0x20bd, lang=English Closed Caption (Wide Screen) [VOBSUB], 3cc=eng ext=5
[00:46:57] scan: id=0x21bd, lang=English Closed Caption (Letterbox) [VOBSUB], 3cc=eng ext=5
[00:46:57] scan: title 1 has 19 chapters
[00:46:57] scan: chap 1, 149434 ms
[00:46:57] scan: chap 2, 395634 ms
[00:46:57] scan: chap 3, 522534 ms
[00:46:57] scan: chap 4, 450466 ms
[00:46:57] scan: chap 5, 554867 ms
[00:46:57] scan: chap 6, 215300 ms
[00:46:57] scan: chap 7, 181667 ms
[00:46:57] scan: chap 8, 308834 ms
[00:46:57] scan: chap 9, 413067 ms
[00:46:57] scan: chap 10, 87300 ms
[00:46:57] scan: chap 11, 753033 ms
[00:46:57] scan: chap 12, 313966 ms
[00:46:57] scan: chap 13, 535833 ms
[00:46:57] scan: chap 14, 245667 ms
[00:46:57] scan: chap 15, 227200 ms
[00:46:57] scan: chap 16, 353800 ms
[00:46:57] scan: chap 17, 284334 ms
[00:46:57] scan: chap 18, 449467 ms
[00:46:57] scan: chap 19, 500 ms
[00:46:57] scan: aspect = 16:9
[00:46:57] scan: decoding previews for title 1
HB [00:46:57] thread 3 started ("libhb")
[00:46:57] CPU: 11th Gen Intel(R) Core(TM) i7-11700K @ 3.60GHz
[00:46:57]  - logical processor count: 16
[00:46:57] Intel Quick Sync Video support: no
[00:46:57] hb_scan: path=C:\Users\jwbla\Desktop\October Sky (1999) 1h48, title_index=1
[00:46:57] thread 4 started ("scan")
src/libbluray/disc/disc.c:437: error opening file BDMV\index.bdmv
src/libbluray/disc/disc.c:437: error opening file BDMV\BACKUP\index.bdmv
[00:46:57] bd: not a bd - trying as a stream/file instead
libdvdread: Could not open input:
libdvdread: Can't open C:\Users\jwbla\Desktop\October Sky (1999) 1h48 for reading
libdvdread: Device C:\Users\jwbla\Desktop\October Sky (1999) 1h48 inaccessible, CSS authentication not available.
libdvdnav: Unable to open device file C:\Users\jwbla\Desktop\October Sky (1999) 1h48.
libdvdread: Could not open input:
libdvdread: Can't open C:\Users\jwbla\Desktop\October Sky (1999) 1h48 for reading
libdvdread: Device C:\Users\jwbla\Desktop\October Sky (1999) 1h48 inaccessible, CSS authentication not available.
[00:46:57] scan: DVD has 1 title(s)
[00:46:57] scan: scanning title 1
[00:46:57] scan: duration is 01:47:22 (6442900 ms)
[00:46:57] pgc_id: 1, pgn: 1: pgc: 00000269dc78cb80
[00:46:57] scan: checking audio 1
[00:46:57] scan: id=0x80bd, lang=English (AC3), 3cc=eng ext=1
[00:46:57] scan: checking audio 2
[00:46:57] scan: id=0x81bd, lang=Francais (AC3), 3cc=fra ext=1
[00:46:57] scan: checking subtitle 1
[00:46:57] scan: id=0x20bd, lang=English Closed Caption (Wide Screen) [VOBSUB], 3cc=eng ext=5
[00:46:57] scan: id=0x21bd, lang=English Closed Caption (Letterbox) [VOBSUB], 3cc=eng ext=5
[00:46:57] scan: title 1 has 19 chapters
[00:46:57] scan: chap 1, 149434 ms
[00:46:57] scan: chap 2, 395634 ms
[00:46:57] scan: chap 3, 522534 ms
[00:46:57] scan: chap 4, 450466 ms
[00:46:57] scan: chap 5, 554867 ms
[00:46:57] scan: chap 6, 215300 ms
[00:46:57] scan: chap 7, 181667 ms
[00:46:57] scan: chap 8, 308834 ms
[00:46:57] scan: chap 9, 413067 ms
[00:46:57] scan: chap 10, 87300 ms
[00:46:57] scan: chap 11, 753033 ms
[00:46:57] scan: chap 12, 313966 ms
[00:46:57] scan: chap 13, 535833 ms
[00:46:57] scan: chap 14, 245667 ms
[00:46:57] scan: chap 15, 227200 ms
[00:46:57] scan: chap 16, 353800 ms
[00:46:57] scan: chap 17, 284334 ms
[00:46:57] scan: chap 18, 449467 ms
[00:46:57] scan: chap 19, 500 ms
[00:46:57] scan: aspect = 16:9
[00:46:57] scan: decoding previews for title 1
VC [00:46:57] Sending Response
  CallId: 1
  Succeeded: True
  Data: <null>
VC [00:46:57] Sending message bytes: 0x08010101046E756C6C
VC [00:47:08] Sending Request
  CallId: 4
  MethodName: Ping
VC [00:47:08] Sending message bytes: 0x09000450696E67000000
VC [00:47:08] Reading message with length 8
VC [00:47:08] Received Response
  CallId: 4
  Succeeded: True
  Data: OK
  Response Bytes: 0x224F4B22
VC [00:47:19] Sending Request
  CallId: 5
  MethodName: Ping
VC [00:47:19] Sending message bytes: 0x09000550696E67000000
VC [00:47:19] Reading message with length 8
VC [00:47:19] Received Response
  CallId: 5
  Succeeded: True
  Data: OK
  Response Bytes: 0x224F4B22
VC [00:47:30] Sending Request
  CallId: 6
  MethodName: Ping
VC [00:47:30] Sending message bytes: 0x09000650696E67000000
VC [00:47:30] Reading message with length 8
VC [00:47:30] Received Response
  CallId: 6
  Succeeded: True
  Data: OK
  Response Bytes: 0x224F4B22

[jwblair47]

Additional data point: the hang is not preset-specific.
I reproduced the same behavior using VidCoder’s built-in Fast 720p30 preset (no custom settings), with the same result: encode starts, a short .part.mp4 is produced, then VidCoder hangs.
The equivalent HandBrakeCLI encode still completes successfully.