Animation Playback Delayed With Time Remapping And AV-Sync #74111

New Issue

Philip Holzmann · 2020-02-22T12:14:05+01:00

Philip Holzmann commented

2020-02-22 12:14:05 +01:00

System Information
Operating system: Windows 10 64 bit
Graphics card: Nvidia GTX 750 Ti

Blender Version
Broken: 2.82.7 hash: 77d23b0bd7

Short description of error
When an animation is played back while both

AV-Sync is enabled
Time Remapping is enabled
the animation playback starts with a delay (upon pressing spacebar).
The delay is the longer, the higher the current frame number is.
Also each time you start playback, it seems as if it started from 0.

Exact steps for others to reproduce the error
time_remapping_delay.blend

Open file
Don't move playhead

Start playback

Notice a ~1s delay, before the cube or playhead actually starts moving.

**System Information** Operating system: Windows 10 64 bit Graphics card: Nvidia GTX 750 Ti **Blender Version** Broken: 2.82.7 hash: 77d23b0bd76f **Short description of error** When an animation is played back while both * AV-Sync is enabled * Time Remapping is enabled the animation playback starts with a delay (upon pressing spacebar). The delay is the longer, the higher the current frame number is. Also each time you start playback, it seems as if it started from 0. **Exact steps for others to reproduce the error** [time_remapping_delay.blend](https://archive.blender.org/developer/F8362658/time_remapping_delay.blend) - Open file - Don't move playhead # Start playback Notice a ~1s delay, before the cube or playhead actually starts moving.

Philip Holzmann commented

2020-02-22 12:14:05 +01:00

Added subscriber: @Foaly

Richard Antalik commented

2020-02-24 17:10:11 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-02-24 17:10:11 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2020-02-24 17:10:11 +01:00

Can not reproduce this

Does this happen, when you click on File -> Defaults -> Load Factory Settings?

Can not reproduce this Does this happen, when you click on File -> Defaults -> Load Factory Settings?

Philip Holzmann commented

2020-02-24 18:36:19 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Philip Holzmann commented

2020-02-24 18:36:19 +01:00

I ran with --factory-startup

I also just tried this on Linux with recent master and it happens as well.
commit 24ea6b713d
Date: Sun Feb 23 16:52:43 2020 +0100

Note that the frame counter starts right away when you play the animation, but the cube starts to move with a delay.

I ran with --factory-startup I also just tried this on Linux with recent master and it happens as well. commit 24ea6b713d7db459327cf2c62e8d596eebf74d59 Date: Sun Feb 23 16:52:43 2020 +0100 **Note** that the frame counter starts right away when you play the animation, but the cube starts to move with a delay.

Richard Antalik commented

2020-02-24 18:50:39 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Richard Antalik commented

2020-02-24 18:50:39 +01:00

I accidentally moved playhead to 0, so i didn't see the issue...

Sebastian Parborg commented

2020-03-24 11:37:25 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2020-03-24 11:37:25 +01:00

Changed status from 'Confirmed' to: 'Needs User Info'

Sebastian Parborg commented

2020-03-24 11:37:25 +01:00

I'm unsure if I am missing something obvious here... It seems to work fine for me with the latest master.
Has this issue been fixed or am I missing something?

recording.mp4

I'm unsure if I am missing something obvious here... It seems to work fine for me with the latest master. Has this issue been fixed or am I missing something? [recording.mp4](https://archive.blender.org/developer/F8426762/recording.mp4)

Philip Holzmann commented

2020-03-24 15:44:48 +01:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Philip Holzmann commented

2020-03-24 15:44:48 +01:00

I just tried with a self-built master b759857825 Tue Mar 24 14:02:16 2020 +0100
and with the alpha from builder.blender.org 94b8166a8b

The issue still exists.

I don't know why it works for you.

I just tried with a self-built master b759857825b80af98621c2ff4b52f106ab79576c Tue Mar 24 14:02:16 2020 +0100 and with the alpha from builder.blender.org 94b8166a8b05 The issue still exists. I don't know why it works for you.

Richard Antalik commented

2020-03-24 16:37:03 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Richard Antalik commented

2020-03-24 16:37:03 +01:00

I can still confirm as well.

I have looked into this briefly, in screen_animation_step()

    else if (scene_eval->id.recalc & ID_RECALC_AUDIO_SEEK) {
      /* Ignore seek here, the audio will be updated to the scene frame after jump during next
       * dependency graph update. */
    }
    else if ((scene->audio.flag & AUDIO_SYNC) && (sad->flag & ANIMPLAY_FLAG_REVERSE) == false &&
             isfinite(time = BKE_sound_sync_scene(scene_eval))) {
      double newfra = (double)time * FPS;

When I start playback, value of newfra starts at 64

So following condition ignores AV sync, until it reaches scene->r.cfra

      /* give some space here to avoid jumps */
      if (newfra + 0.5 > scene->r.cfra && newfra - 0.5 < scene->r.cfra) {
        scene->r.cfra++;
      }
      else {
        scene->r.cfra = max_ii(scene->r.cfra, newfra + 0.5);
      }

It seems to me that either BKE_sound_sync_scene(scene_eval) or audio seek position is not corrected by time remapping. Also I am not sure if time remapping is supposed to control audio pitch - that would be another thing to consider.

I can still confirm as well. I have looked into this briefly, in `screen_animation_step()` ``` else if (scene_eval->id.recalc & ID_RECALC_AUDIO_SEEK) { /* Ignore seek here, the audio will be updated to the scene frame after jump during next * dependency graph update. */ } else if ((scene->audio.flag & AUDIO_SYNC) && (sad->flag & ANIMPLAY_FLAG_REVERSE) == false && isfinite(time = BKE_sound_sync_scene(scene_eval))) { double newfra = (double)time * FPS; ``` When I start playback, value of `newfra` starts at 64 So following condition ignores AV sync, until it reaches `scene->r.cfra` ``` /* give some space here to avoid jumps */ if (newfra + 0.5 > scene->r.cfra && newfra - 0.5 < scene->r.cfra) { scene->r.cfra++; } else { scene->r.cfra = max_ii(scene->r.cfra, newfra + 0.5); } ``` It seems to me that either `BKE_sound_sync_scene(scene_eval)` or audio seek position is not corrected by time remapping. Also I am not sure if time remapping is supposed to control audio pitch - that would be another thing to consider.

Sebastian Parborg commented

2020-03-24 18:12:13 +01:00

Ah, nvm... I can reproduce this on my end too. I had just built blender without any sound support and that is why it was working x)