Offline DV conversion leaves DOVI side data in H.264

[DeimosF 0]

Hi,

I have a long-standing issue with offline conversions (Download / Convert Media) of Dolby Vision content.

Setup:

• Emby Server 4.10.0.40
• NVIDIA Tesla P4 (NVDEC + NVENC)
• Hardware tone mapping enabled (tested Hable, Mobius, Reinhard)

Source:
4K Dolby Vision Profile 8.1 (HDR10 compatible) HEVC Main 10

What works:

• Live on-the-fly transcoding (HLS) works fine.
• Converting regular 4K H.264 → 1080p H.264 works fine.

What fails: When converting DV Profile 8.1 → 1080p H.264 for offline use, the resulting file does not play on mobile devices (black screen).

Analysis from logs:

Tone mapping is applied correctly:

tonemap_cuda=...:format=yuv420p
setparams=color_primaries=bt709:color_trc=bt709:colorspace=bt709

Output video stream is correctly tagged as:

cuda(tv, bt709, progressive)

However, the DOVI configuration record is still present in the side data of the output file:

Side data:
  DOVI configuration record: version: 1.0, profile: 8, level: 6, rpu flag: 1, el flag: 0, bl flag: 1, compatibility id: 1

This residual Dolby Vision side data on an H.264 stream causes many mobile players to fail.

I also tested Parameter Adjustment with -bsf:v filter_units=remove_types=6 — the parameter is applied, but the DOVI configuration record remains.

Conclusion:
Emby correctly tone-maps the pixels to SDR BT.709 during offline conversion, but does not strip the DOVI configuration record from the output container. This breaks playback on mobile clients.

Is this a known limitation of the offline conversion pipeline?
Any chance this can be fixed so that DOVI side data is removed when tone mapping to SDR H.264?

I can provide full ffmpeg logs if needed.

Thanks.

[DeimosF 0]

Additional test: pure HDR10 (no Dolby Vision) converts correctly and plays fine on mobile.

The issue only occurs when the source contains a DOVI configuration record.