[BUG] Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - Printable Version +- Selur's Little Message Board (https://forum.selur.net) +-- Forum: Hybrid - Support (https://forum.selur.net/forum-1.html) +--- Forum: Problems & Questions (https://forum.selur.net/forum-3.html) +--- Thread: [BUG] Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to (/thread-4531.html)

Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - tamo_bln - 08.11.2026 Hi Selur, I'm experiencing a problem with TrueHD/Atmos audio extraction in Hybrid 2026.11.07.1 (AppImage) on Fedora Workstation 45. Source: Blu-ray source Playlist: 00005.mpls Audio track ID: 4353 Audio format: Dolby TrueHD + Dolby Atmos Channels: 7.1 Sample rate: 48 kHz Intended output: Video: SVT-AV1 Audio: Opus 7.1, 256 kbit/s No subtitles Problem When enabling Config → Input → Extraction → Prefer ffmpeg for extraction from transport streams, Hybrid attempts to extract the TrueHD audio stream using FFmpeg with stream copy into an .ac3 file. This fails. When disabling that preference, Hybrid uses its bundled tsMuxeR 3.0.1 ( git-1f5b692 ) to extract the audio track. However, tsMuxeR produces an .ac3+thd file containing both the AC3 core and TrueHD data. Hybrid subsequently renames this file to .thd without removing the AC3 core. This was confirmed by comparing SHA-256 hashes before and after renaming. The resulting file cannot be processed correctly by the subsequent FFmpeg/SoX/opusenc audio conversion pipeline. The option Audio → Misc → Automatic TrueHD to ac3 was disabled. Successful manual workaround I tested the bundled tsMuxeR executable directly using the following meta file: MUXOPT --no-hdmv-descriptors --new-audio-pes --demux --vbr --vbv-len=500 A_AC3, "/path/to/BDMV/PLAYLIST/00005.mpls", track=4353, drop-ac3-core The important parameter is: drop-ac3-core This produces a proper .thd file without the embedded AC3 core. The complete extraction succeeded with exit code 0 and produced a TrueHD file of approximately 4.0 GB. FFprobe identified the extracted stream as: codec_name=truehd profile=Dolby TrueHD + Dolby Atmos sample_rate=48000 channels=8 channel_layout=7.1 Successful complete Opus conversion I subsequently converted the entire extracted TrueHD stream using: FFmpeg → SoX → opusenc Opus encoding settings: --bitrate 256 --comp 10 --framesize 20 --expect-loss 0 --max-delay 1000 --ignorelength Results: Input:       48 kHz, 8 channels Output:      Opus 7.1 Duration:    02:50:21.94 Runtime:     00:05:33 Speed:       30.7x realtime Output size: 269626562 bytes FFprobe confirmed: codec_name=opus sample_rate=48000 channels=8 channel_layout=7.1 duration=10221.927333 size=269626562 bit_rate=211018 A subsequent full decoding test using FFmpeg completed without reported decoding errors: time=02:50:21.92 speed=265x elapsed=0:00:38.63 The manual workflow therefore successfully extracts, converts and decodes the complete audio stream. The actual channel mapping has not yet been independently verified. Suspected cause Hybrid appears to be missing the drop-ac3-core parameter when extracting a combined AC3 + TrueHD stream with tsMuxeR. Renaming an .ac3+thd file to .thd does not remove the AC3 core. Would it be possible for Hybrid to pass drop-ac3-core to tsMuxeR when extracting a TrueHD stream intended for further audio encoding? This would allow Hybrid's existing FFmpeg/SoX/opusenc conversion pipeline to process the resulting .thd stream correctly. I can provide the relevant Hybrid debug log and additional test results if needed. Thanks for looking into this! Kind regards tamo_bln RE: Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - Selur - 08.11.2026 I'll look at it. Cu Selur RE: Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - tamo_bln - 08.11.2026 Thank you for looking into this tamo_bln RE: Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - Selur - 08.11.2026 Uploaded a new dev which hopefully fixes it. Cu Selur RE: Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - tamo_bln - 08.11.2026 Hi Selur, Thanks for the updated dev build! I've tested it with the same Blu-ray source and Dolby TrueHD 7.1 audio track that caused the original issue. Good news: This time, Hybrid successfully completed the audio extraction using tsMuxeR and the subsequent conversion to Opus without any errors. The SVT-AV1 video encoding is currently running, so the final muxing and playback verification are still pending. Once the job has finished, I'll check the resulting MKV to confirm that the complete 7.1 audio track has been preserved correctly. Thanks again for looking into this and providing a fix! Cu RE: Hybrid 2026.11.07.1 – TrueHD/Atmos extraction fails when converting Blu-ray audio to - tamo_bln - 08.11.2026 Hi Selur, Good news! I've tested the new dev build with the same Blu-ray source and Dolby TrueHD 7.1 track that caused the original issue. Both the audio extraction and the subsequent Opus conversion completed successfully without errors. I also checked the Hybrid debug log and confirmed that tsMuxeR is now called with the drop-ac3-core parameter for the TrueHD track. This appears to have resolved the original extraction issue. The resulting Opus file was created successfully. The video encoding is still running, but that's unrelated to the original bug. Thanks a lot for the quick fix and your efforts! Cu tamo_bln