screen record lag

[killown]

➜ ~ wl-screenrec -o DP-1
Using output DP-1
Opening libva device from DRM device /dev/dri/renderD128
[h264_vaapi @ 0x55ebd4ab7300] No usable encoding entrypoint found for profile VAProfileH264High (7).
failed to open encoder in low_power mode (Function not implemented), trying non low_power mode. if you have an intel iGPU, set enable_guc=2 in the i915 module to use the fixed function encoder. pass --low-power=off to suppress this warning
[h264_vaapi @ 0x55ebd4ab7300] Driver does not support some wanted packed headers (wanted 0xd, found 0x1).

screenrecord.mp4

[killown]

➜ ~ vainfo
Trying display: wayland
vainfo: VA-API version: 1.20 (libva 2.20.1)
vainfo: Driver version: Mesa Gallium driver 23.3.2-arch1.2 for AMD Radeon RX 6600 (radeonsi, navi23, LLVM 16.0.6, DRM 3.54, 6.6.9-arch1-1)
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointVLD
VAProfileHEVCMain : VAEntrypointEncSlice
VAProfileHEVCMain10 : VAEntrypointVLD
VAProfileHEVCMain10 : VAEntrypointEncSlice
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileVP9Profile0 : VAEntrypointVLD
VAProfileVP9Profile2 : VAEntrypointVLD
VAProfileAV1Profile0 : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc

[russelltg]

Interesting, is the weird jumpiness visible on screen while recording, or is it just visiable in the recorded file during playback?

Does wf-recorder -c h264_vaapi -d /dev/dri/renderD128 have the same issue?

[killown]

Interesting, is the weird jumpiness visible on screen while recording, or is it just visiable in the recorded file during playback?

Does wf-recorder -c h264_vaapi -d /dev/dri/renderD128 have the same issue?

only in the record, obs for example works fine with ffmpeg h264 vaapi

[russelltg]

What compositor is this?

[killown]

What compositor is this?

hyprland

[ghost]

@killown Same on Hyprland, NixOS... All was fine, but after update - it's happened.

[dominikh]

I can reproduce the issue on NixOS with Sway, with wl-screenrec 0.1.0. The problem reproduces when using --output or when using -g and specifying an entire output worth. It doesn't happen with -g and geometry that's a single pixel smaller than the entire output.

$ wl-screenrec -g '4000,415 2560x1440' -v
Using output DP-2
Opening libva device from DRM device /dev/dri/renderD128
+----------+
|    in    |default--[3840x2160 0:1 vaapi]--Parsed_crop_0:default
| (buffer) |
+----------+

                                                            +--------------+
Parsed_scale_vaapi_1:default--[3840x2160 0:1 vaapi]--default|     out      |
                                                            | (buffersink) |
                                                            +--------------+

                                          +---------------+
in:default--[3840x2160 0:1 vaapi]--default| Parsed_crop_0 |default--[3840x2160 0:1 vaapi]--Parsed_scale_vaapi_1:default
                                          |    (crop)     |
                                          +---------------+

                                                     +----------------------+
Parsed_crop_0:default--[3840x2160 0:1 vaapi]--default| Parsed_scale_vaapi_1 |default--[3840x2160 0:1 vaapi]--out:default
                                                     |    (scale_vaapi)     |
                                                     +----------------------+


[h264_vaapi @ 0x561718339400] No usable encoding entrypoint found for profile VAProfileH264High (7).
failed to open encoder in low_power mode (Function not implemented), trying non low_power mode. if you have an intel iGPU, set enable_guc=2 in the i915 module to use the fixed function encoder. pass --low-power=off to suppress this warning
[h264_vaapi @ 0x561718339400] Driver does not support some wanted packed headers (wanted 0xd, found 0x1).
Output #0, mp4, to 'screenrecord.mp4':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), vaapi, 3840x2160, q=2-31, 40000 kb/s, 90k tbn
50 fps
51 fps
51 fps
51 fps
^C%

$ wl-screenrec -g '4000,415 2560x1439' -v
Using output DP-2
Opening libva device from DRM device /dev/dri/renderD128
+----------+
|    in    |default--[3840x2160 0:1 vaapi]--Parsed_crop_0:default
| (buffer) |
+----------+

                                                            +--------------+
Parsed_scale_vaapi_1:default--[3840x2159 0:1 vaapi]--default|     out      |
                                                            | (buffersink) |
                                                            +--------------+

                                          +---------------+
in:default--[3840x2160 0:1 vaapi]--default| Parsed_crop_0 |default--[3840x2160 0:1 vaapi]--Parsed_scale_vaapi_1:default
                                          |    (crop)     |
                                          +---------------+

                                                     +----------------------+
Parsed_crop_0:default--[3840x2160 0:1 vaapi]--default| Parsed_scale_vaapi_1 |default--[3840x2159 0:1 vaapi]--out:default
                                                     |    (scale_vaapi)     |
                                                     +----------------------+


[h264_vaapi @ 0x555c92e23fc0] No usable encoding entrypoint found for profile VAProfileH264High (7).
failed to open encoder in low_power mode (Function not implemented), trying non low_power mode. if you have an intel iGPU, set enable_guc=2 in the i915 module to use the fixed function encoder. pass --low-power=off to suppress this warning
[h264_vaapi @ 0x555c92e23fc0] Driver does not support some wanted packed headers (wanted 0xd, found 0x1).
Output #0, mp4, to 'screenrecord.mp4':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), vaapi, 3840x2159, q=2-31, 40000 kb/s, 90k tbn
42 fps
60 fps
59 fps
60 fps
59 fps
52 fps
60 fps
^C%

screenrecord.mp4

screenrecord.mp4

An observation that may or may not be relevant: when capturing the 2560x1440 region (which has an unscaled resolution of 3840x2160), the frame rate is a stable 51 fps. When capturing the 2560x1439 region, the frame rate is 60 fps most of the time, but repeatedly dips down to ~50 fps.

[russelltg]

Super interesting to me! We always capture full outputs (dmabuf does not support partial captures), so the issue is with something after that...weird! @varmisa do you know what update broke it? Possible culprits are mesa and ffmpeg.

Could hyprland be giving frames out of order? Also never got an answer to if

wf-recorder -c h264_vaapi -d /dev/dri/renderD128

has the same issue.

[ghost]

@russelltg I don't remember what the update it was, today i will test this command with wf-recorder.

[dominikh]

For me, wf-recorder -c hevc_vaapi -d /dev/dri/renderD128 works fine. wf-recorder -c h264_vaapi -d /dev/dri/renderD128 just hangs indefinitely without producing any video.

In wl-screenrec, the stutter doesn't reproduce for me when using --codec hevc, it only reproduces with auto and avc (I'm not able to test vp8 or vp9, however.)

[dominikh]

Interestingly, the wf-recorder hang can also be fixed by specifying a geometry that's slightly smaller than the actual screen. However, in that case, wf-recorder reproduces the issue that wl-screenrec has when recording the entire screen...

Furthermore, after updating wl-screenrec from a36c5923009b44f2131196d8a3a234948f8e0102 to v0.1.3, the h264 recording is always stuttery, even when specifying different geometries.

[dominikh]

I've bisected the wl-screenrec change in behavior to

commit e0945ebed09be1a819217f7316ddae30fb82989e (HEAD)
Author: Russell Greene <russellgreene8@gmail.com>
Date:   Sat Nov 18 21:16:09 2023 -0700

    fix off-by-one errors in region
    
    workaround for upstream ffmpeg bug

Before that commit, recording at a geometry smaller than the screen, there is no stutter/time travel. Since that commit, recording at any geometry stutters.

Further testing reveals that it's not any smaller geometry that works, but only those that result in an odd-sized width or height (after considering scaling).

[dominikh]

Disabling b-frames via

diff --git i/src/main.rs w/src/main.rs
index 5ea7e59..a281b19 100644
--- i/src/main.rs
+++ w/src/main.rs
@@ -1181,6 +1181,7 @@ fn make_video_params(
     enc.set_height(encode_h as u32);
     enc.set_time_base(Rational(1, 1_000_000_000));
     enc.set_frame_rate(Some(framerate));
+    enc.set_max_b_frames(0);
     if let Some(gop) = args.gop_size {
         enc.set_gop(gop);
     }

works around the issue. Of course that's not a satisfying solution, but it points towards the nature of the problem.

[russelltg]

@dominikh what hardware do you have?

Definitely a strange issue to be sure, also considering the nature it's surprising I don't see it as well.

I'm trying to find the link between b-frames and exact=1....super strange. exact=1 has to do with handling of odd-positioned or odd-sized crop capture regions. the b-frames lead is quite interesting though, and make me think I'm mishandling PTS/DTS....

[dominikh]

vainfo: Driver version: Mesa Gallium driver 23.3.3 for AMD Radeon RX 6700 XT (radeonsi, navi22, LLVM 16.0.6, DRM 3.54, 6.6.16)

[ghost]

vainfo: Driver version: Mesa Gallium driver 23.3.3 for AMD Radeon RX 6700 XT (radeonsi, navi22, LLVM 16.0.6, DRM 3.54, 6.6.16)

Very interesting, i have same GPU...

[kohsine]

Just wanted to add also experiencing this issue. Issue so far has only affected 6000 series cards? I wonder if any other cards are affected by this bug.

vainfo: Driver version: Mesa Gallium driver 24.0.5-arch1.1 for AMD Radeon RX 6800 XT (radeonsi, navi21, LLVM 17.0.6, DRM 3.57, 6.8.7-zen1-1-zen)

[AmazinAxel]

Just wanted to drop this here too -- this bug is also experienced on integrated Radeon graphics (also using NixOS + Hyprland, occurred after an update)
vainfo: Driver version: Mesa Gallium driver 24.0.7 for AMD Radeon Graphics (radeonsi, rembrandt, LLVM 17.0.6, DRM 3.57, 6.9.3)
It should also be noted that wf-recorder -c hevc_vaapi -d /dev/dri/renderD128 works completely fine