Transcode issue with a specific title

[Nuitarius 22]

Hi there guys,

I am having some issues with a specific title. Transformers One (4K).

What I see: I play the movie, after a few seconds it stops the playback and buffers and then resumes. This is done on repeat. The "Stats for nerds" is saying that it is reducing the bitrate due the quality. Playback without transcoding works fine.

Usually I do not have challenges with playback but at least on this title i am. My GFX seems to be detected properly, so I am assuming the issues is something else.

Could you guys look into my logs and let me know if there is something I should be doing differently?

I believe there should be several instances of me trying to doing playback of it here, and I can se at 15:58 at least a playback that had some error.
 

Quote

 

15:58:52.818 [hevc @ 0x37e416c0] First slice in a frame missing.
        Last message repeated 6 times
    15:58:52.818 [hevc @ 0x37e416c0] Skipping NAL unit 63
        Last message repeated 10 times
    15:58:52.819 [hevc @ 0x37f045c0] Multiple Dolby Vision RPUs found in one AU. Skipping previous.

15:58:53.428 [libx264 @ 0x37c23d00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
15:58:53.429 [hevc @ 0x37f045c0] Skipping NAL unit 63
    Last message repeated 10 times
15:58:53.434 [libx264 @ 0x37c23d00] profile High, level 4.0, 4:2:0, 8-bit
15:58:53.435 [libx264 @ 0x37c23d00] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0 me=hex subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=4 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=72 keyint_min=37 scenecut=0 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=3616 vbv_bufsize=7232 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00

15:58:53.435 Could not write header for output file #0 (incorrect codec parameters ?): No such file or directory
15:58:53.435 Error initializing output stream 0:0 -- 

 

Thanks a lot for any help

embyserver.txt ffmpeg-transcode-58497fea-b614-4dea-b5f9-801dca0b0b92_1.txt

Edited Thursday at 05:44 PM by Nuitarius

[Luke 42785]

Hi, can you try remuxing a new version of this file using mkvtoolnix and see how that compares? Thanks.

[Nuitarius 22]

16 hours ago, Luke said:

Hi, can you try remuxing a new version of this file using mkvtoolnix and see how that compares? Thanks.

Hi Luke,

I normally do not remux. I just use makemkv to rip at full quality. I have done it on rare titles that has more than one disc that I want to merge, but otherwise I never use it.

I can also re-rip it if you think this will help?

Do you believe that a remux will tell you something about what is wrong or why do you want me to try this?

[Luke 42785]

Quote

I can also re-rip it if you think this will help?

No I think it will just produce the same result.

Quote

Do you believe that a remux will tell you something about what is wrong or why do you want me to try this?

It's worth trying. If the remuxed version plays then most likely there's something wrong with the headers in the original file.

If you test this then make sure to run a library scan after updating the file. In other words, don't just update the file and then try to play because the server will be doing that based on outdated media information.

[Nuitarius 22]

On 7/24/2026 at 11:20 PM, Luke said:

No I think it will just produce the same result.

It's worth trying. If the remuxed version plays then most likely there's something wrong with the headers in the original file.

If you test this then make sure to run a library scan after updating the file. In other words, don't just update the file and then try to play because the server will be doing that based on outdated media information.

Hi Luke,

Thanks for the assist. I believe I found the culprit.

I did the remux as you said, but it gave identical result. So I went down a rabbit hole.

Apparently my Quadro P1000 is not able to transcode 4K videos that i rip. I am unsure exactly why because nvidia states that it at least supports 10bit HEVC, but only in 4:2:0 so I must assume current day 4K's are running at least 4:2:2?
I found out by doing nvidia-smi while transcoding and saw it was using 0% of the GPU while transcoding 4K while using 6% while transcoding blu rays. So it must be denying service and emby is silently falling back to CPU. Interestingly it was only using 1 core, during this fallback, which is why I didn't see a heavy CPU use. When I disable HEVC decoder in transcoding it can now use all 4 cores and it is transcoding fine. It needs 90% of my CPU to do the job *jeez*

It seems I will have to do some upgrading.

Edited 31 minutes ago by Nuitarius