broken voice message spectrogram

[chelaxian]

as mentioned here tdlib/telegram-bot-api#354

sound spectrogram will be flat like that for big/long voice files

This is expected behavior for voice messages bigger than 1 MB, for which waveform can't be generated server-side. As documented, such voice messages can't be uploaded by URL at all, and if uploaded as file they have only properties passed during the upload.

The waveform is generated by the app, which uploads the file. Bot API doesn't support bot-side waveform generation.

Waveforms for voice messages bigger than 1 MB are added by the app, which uploads the file. There is no way to add a waveform through Bot API.

[chelaxian]

fixed in release 1.1

[chelaxian]

thanks to TelegramPlayGround/pyrogram@26854da