Two Blu-ray and 4K UHD authoring software processing modes: the difference between Passthrough and Transcode


    Many of the movies available for download are extracted from Blu-ray discs using tools like MakeMKV( or MKVToolNix( When converting these MKV files into Blu-ray Discs or 4K UHD discs, it's advisable to utilize passthrough mode for optimal results. Passthrough mode offers fast processing without compromising the video and audio quality. However, despite the availability of numerous Blu-ray authoring software, most of them operate using transcode mode rather than passthrough mode. Only a few, like Yuhan Blu-ray Creator and Yuhan 4K UHD Creator, fully support both passthrough and transcode modes.

There are two primary processing modes for creating Blu-ray discs: Passthrough and Transcode.


In Passthrough mode, the video, audio, and subtitle streams from the original file are copied directly to the Blu-ray disc. This method offers the advantage of very fast processing speed and preserves the original quality of the video and audio. However, one drawback is that since it involves a complete copy, compression isn't possible. For instance, attempting to use Passthrough mode with a 40GB MKV file may not fit onto a BD25 disc. Additionally, the video and audio of the original file must fully meet Blu-ray specifications for the resulting Blu-ray disc to function properly.


On the other hand, Transcode mode does not have specific requirements for the video. By decoding and then re-encoding the content, it ensures that the resulting Blu-ray fully complies with specifications. While this mode ensures compatibility, it is slower compared to Passthrough mode and may result in slight loss of audio and video quality due to the re-encoding process.



Part 1: Under what circumstances should passthrough mode be used?


Passthrough mode imposes strict requirements on video and audio quality. Video must adhere to either Blu-ray or 4K UHD Blu-ray standards, such as using H264 or HEVC 10-bit encoding, with resolutions like 1080P or 4K, and specific frame rates. Audio formats like AC3, EAC3, DTS, DTS HD Master, TrueHD (Dolby Atmos), or Blu-ray PCM are required, with sample rates of 48K, 96K, or 192K.


When working with movies ripped from Blu-ray or UHD discs, if the file's size is slightly larger than the disc's capacity, passthrough mode becomes ideal. This mode ensures lossless copying of both video and audio streams, maintaining original quality while significantly speeding up the process, akin to a simple file copy.


It's essential to ensure that any self-encoded video meets the strict Blu-ray or 4K UHD Blu-ray specifications before opting for passthrough mode. Otherwise, it's advisable to avoid this mode, as non-compliant content may result in a disc that fails to function correctly.


The typical software that works in Passthrough mode is tsMuxer (


Part 2: Under what circumstances should transcode mode be used?


Transcode mode offers versatility for encoding various video files into Blu-ray or 4K UHD Blu-ray standard discs. Its key advantage lies in producing discs compatible with any player, ensuring seamless playback. Unlike passthrough mode, transcode mode can compress large 40G video files to fit onto a BD25 disc, optimizing storage without sacrificing quality. However, this mode tends to operate at a slower pace compared to passthrough mode and may incur minimal loss in video and audio quality.


Most of the Blu-ray authoring software and UHD authoring software currently available do not support passthrough mode, and they generally use transcode mode. Yuhan Blu-ray Creator and Yuhan 4K UHD Creator are the few authoring software that supports both modes.


Part 3: Features of Yuhan Blu-ray Creator and Yuhan 4K UHD Creator


Yuhan Blu-ray Creator and Yuhan 4K UHD Creator are versatile authoring software options. Both support passthrough and transcode modes, offering flexibility in encoding. Regardless of the mode chosen, they enable the inclusion of multiple audio tracks, subtitles, and come equipped with an extensive library of menu templates. Moreover, these software solutions support high-quality audio formats such as TrueHD (Dolby Atmos), DTS HD Master, and Blu-ray PCM. Particularly, Yuhan 4K UHD Creator excels in preserving advanced visual technologies like Dolby Vision and HDR10, ensuring an exceptional viewing experience.


Key features of Yuhan Blu-ray Creator and Yuhan 4K UHD Creator:


  • Support two working modes: pass-through and transcoding.
  • Support any Blu-ray frame rate, including 23.976fps, 24fps, 25fps, 29.97fps, 50fps, 59.94fps.
  • Add disc menu from preset templates, or edit disc menu in various ways: add background music, image or video at will, set background music effect, set First Play video clip, skip menu at will, edit various layers of disc menus, preview disc menu customization instantly, etc.
  • Retain HDR10 & Dolby Vision Effects Video and Blu-ray PCM, TrueHD, DTS HD Master Audio.
  • Available for both Windows and Mac.


Part 4: How do I use passthrough mode and transcoding mode?


1. Load the video file. Yuhan Blu-ray Creator and Yuhan 4K UHD Creator support almost all video formats, you can click "Add Video" to add them, or you can directly drag the files to the software interface. At the same time, it also supports multi-audio track and multi-subtitle, after the file is loaded, you can choose the audio track and subtitle you need.



2. Select the menu and customize it. Yuhan Blu-ray Creator has 24 built-in menu templates, you can choose one template you like, and you can also add a lot of personalized settings, such as adding "First Play" videos, so that your discs are more like commercial discs, you can also set menu background images, background videos, background music, etc.




3. Click the menu to open the settings dialog.


On Windows:


On Mac:


In the settings dialog box, locate the option labeled "Blu-ray & UHD Processing Mode." If the video satisfies the criteria for "Passthrough" mode—such as having a resolution of 1920x1080 or 3820x2160—you can opt for "Passthrough." However, if the video doesn't meet these criteria, like having a different resolution, the software will display a prompt dialog when creating the output. "Passthrough" mode is recommended for users familiar with Blu-ray specifications. On the other hand, "Transcode" mode imposes no such restrictions, resulting in discs that are more widely compatible with players, albeit at the cost of increased processing time.



4. Select your preferred method for outputting your content. Yuhan Blu-ray Creator offers three options: saving to a folder, creating an ISO file, or burning directly to a disc. Regardless of the format you choose, playback issues are not a concern. The Blu-ray discs created by Yuhan Blu-ray Creator boast broad compatibility, ensuring seamless playback on various platforms. Whether it's on your computer using media players like VLC Media Player, PowerDVD, or Kodi, or on standalone home players such as Sony, Panasonic, Samsung, Xbox, and more, your content will play flawlessly.



5. Production. Click the start button above and Yuhan Blu-ray Creator will start working, please wait patiently for it to finish.



Part 5: Conclusion

After reading the above content, I believe you must have understood the passthrough mode and transcode mode,
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