Unable to playback AV1 HDR10

[ghost]

Trying to play a 4K file with HDR10 using the codec AV1, Clapper info HW vaav1dec with intel Xe graphic. Other content in SDR with same codecs works fine.

PC spec:

Fedora 39 Clapper: 0.5.2+git.100~51e1dd8-22.2

[Rafostar]

Can you play this file from command line successfully?

GST_PLUGIN_FEATURE_RANK=vaav1dec:300 gst-play-1.0 --videosink=glimagesink "video.mkv"

[ghost]

Can you play this file from command line successfully?

GST_PLUGIN_FEATURE_RANK=vaav1dec:300 gst-play-1.0 --videosink=glimagesink "video.mkv"

Nope, got this in the terminal:

Redistribute latency... Redistribute latency... ERROR Internal data stream error. for file:///home/test.mkv ERROR debug information: ../gst/matroska/matroska-demux.c(6109): gst_matroska_demux_loop (): /GstPlayBin:playbin/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0/GstMatroskaDemux:matroskademux0: streaming stopped, reason not-negotiated (-4) warning: queue 0x7efd50000be0 destroyed while proxies still attached: wl_seat@7 still attached xdg_wm_base@6 still attached wl_subcompositor@5 still attached wl_compositor@4 still attached wl_registry@2 still attached

[Rafostar]

In your command line same error happens. So its not a Clapper bug.

ERROR Internal data stream error

What you should do is check if the same error continues with latest GStreamer version 1.24 (I think Fedora is still on 1.22) and if it does, please report it on their gitlab repo instead. There does not appear to be anything that can be fixed within Clapper to fix this.

As a workaround until fixed upstream, you can use software DAV1D decoder from GStreamer Rust plugins. Dunno if/what package Fedora has for it. You can also compile it from source. Once you have it installed you can override its rank from within Clapper preferences window, so it will be used instead of vaav1dec hardware decoder which seems to have problems.

FWIW, Clapper Flatpak Nightly builds here include both latest GStreamer code from git and are build with dav1d decoder. You can use that too if you want, just note that these are highly unstable.

[ghost]

dav1d

Oh, okey thanks! Did try out the Nightly build, it can now play the file! What value need i enable for dav1d to enable HRD->SDR conversion?

[Rafostar]

Oh, okey thanks! Did try out the Nightly build, it can now play the file!

Does it play with vaav1dec or dav1ddec ?

For conversion support within GStreamer, there is already: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1631

Alternatively (assuming it now plays with vaav1dec) you can try (rs)dav1ddec for a fast software decoder. Chances are the legacy vaapi plugin (vaapidecodebin) might do HDR->SDR post-processing automatically too. You should try overriding their ranks and check what/if something works best for you.

Just note, that if you override (rs)dav1ddec it will affect only AV1 videos (since its AV1 decoder only), but overriding vaapidecodebin will result with legacy plugin being used for all media that your GPU can HW decode which is something you probably do not want.

[ghost]

vaav1dec

Hey, it does play with vaav1dec now. Is dav1ddec better? Is not HW decoder better the software?

[Rafostar]

Hey, it does play with vaav1dec now. Is dav1ddec better? Is not HW decoder better the software?

vaav1dec is the best and newest decoder (performance-wise) you can currently get in GStreamer for your Intel GPU. The problem is that as in MR I linked earlier, GStreamer is in the middle of implementing HDR->SDR conversion. So I suggested trying either software or old (deprecated) vaapi decoder to check if you can somehow workaround lack of HDR<->SDR conversion until its implemented there.