Combat screen, creature animation freeze during movement at start of combat about fheroes2 HOT 4 OPEN

I'd say that the reason is the same as in #8376 and #8375 - WAV sound effect playback is started with a noticeable delay on this particular PC, which shouldn't be, because WAV playback is very cheap.

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Marking this as an audio-related issue but it's just a guess because I cannot reproduce this on my devices.

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I would say that the problem here and in other similar issues (#8375, #8376) is that WAV sound is played at the same moment that the MIDI music starts (and the MIDI music is a heavy thing), and until the MIDI music starts, it's impossible to play anything else, because SDL_mixer functions themselves are not safe for simultaneous use from multiple threads (at least it seems so after a cursory acquaintance with their insides).

This problem is observed with MIDI music only (not with external music, because external MP3/FLAC/OGG music is a relatively light thing in comparison with MIDI). Playback of horse steps is performed in background thread, therefore, their playback is just delayed a bit - that's why their playback continues a little longer after the hero stops, while playback of musical effects for map objects is performed in the main thread, and this can lead to animation delays when the corresponding object located on the border of two terrains with different music is visited. The same applies to the playback of musical effects for units at the beginning of the battle when the background battle MIDI music starts.

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Hello @Branikolog,

Hi, @LeHerosInconnu Are you using MIDI? I believe this issue is valid only for MIDI sound, while for external music I cannot reproduce this problem.

Yes, MIDI is used when the problem is detected. I did a test with .ogg files in the MUSIC folder and "Music Type" set to "External" and the problem is no longer present. There must have been a change in MIDI management at some point.

Originally posted by @LeHerosInconnu in #8375 (comment)

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