https://bugs.kde.org/show_bug.cgi?id=462018
Bug ID: 462018
Summary: Rendering a video in H.265 with 10-bit color using
libx265 always results in a video with 8-bit color, no
matter what settings are used
Classification: Applications
Product: kdenlive
Version: 22.08.3
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: fuza-...@proton.me
Target Milestone: ---
SUMMARY
Rendering a video in H.265 with 10-bit color using libx265 always results in a
video with 8-bit color, no matter what settings are used.
Based on documentation, recommendations, examples, and shots in the dark,
different combinations of parameters & values like mlt_image_format (rgb | rgba
| rgb24), pix_fmt (yuv420p10le | yuv422p10le | yuv444p10le | p10le), and
colorspace (rgb | 709 | bt709) have been tried without success, with the
appropriate combinations working as intended in other codecs.
Aborting mid-render in the Job Queue tab to bring up the error log box (from
22.08.3 onward) always shows that libx265 only has 8-bit support, e.g. "x265
[info]: build info [Linux][GCC 9.3.1][64 bit] 8bit".
The same behavior occurs on multiple versions of Kdenlive, specified below.
Attempting an equivalent command with stand-alone ffmpeg built with libx265
10-bit support produces the expected 10-bit video.
STEPS TO REPRODUCE
1. Open Kdenlive
2. Click the "Add Clip or Folder..." button in the Project Bin
3. Select the source video file and press the "OK" button to add the clip
4. When prompted to switch to clip profile, click the "Switch" button
5. Click and drag the video from the "Clip Monitor" to the "V1" timeline below
all the way to the left and release
6. Click the "Project" menu, and then the "Render..." option to open the
"Rendering" window
7. (For 22.08.3) Create a custom preset by clicking the "Create new preset"
button, type "Custom" for the "Group" field, "H.265 10-bit" for the "Preset
name" field, select "matroska" in the "Container" drop-down menu, then click
the "Edit Render Preset" button in the lower left corner of the window to
display a textbox right above it, delete the text in it and replace it with the
following line:
f=matroska vcodec=libx265 mlt_image_format=rgb pix_fmt=yuv420p10le an=1
audio_off=1
Then click the "OK" button in the lower right corner of the window to save the
custom preset. This step is only needed the first time and can be skipped in
following tries.
8. In the "Rendering" window choose an appropriate path and filename for the
video to be rendered, then select the newly created custom preset "H.265
10-bit" from the "Custom" group in the "Presets" list, and click the button
"Render to File" to start rendering the video
9. Wait until the rendering job finishes in the "Job Queue" tab
10. Video rendered
OBSERVED RESULT
When examining the rendered video with MediaInfo, its output shows that the
video's bit depth is 8 bits and the writing library only had 8-bit support.
EXPECTED RESULT
When examining the rendered video with MediaInfo, its output should show that
the video's bit depth is 10 bits and the writing library had 10-bit support.
SOFTWARE/OS VERSIONS
OS: Ubuntu 20.04.5 LTS 64-bit
Kdenlive:
22.04.3 (MLT 7.8.0, Ubuntu repositories)
22.08.3 (MLT 7.10.0, AppImage)
22.11.80/22.12 Beta1 (MLT 7.11.0, AppImage)
23.03.70 rev. 589b3eb24 (MLT 7.11.0, AppImage)
23.03.70 rev. d592484a4 (MLT 7.11.0, AppImage)
ADDITIONAL INFORMATION
For more context:
https://www.reddit.com/r/kdenlive/comments/yxz3iv/is_it_possible_to_render_directly_to_h265_hevc/
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