Videos are black - just hearing sound

[omidraha]

Hi,
I download a video from YouTube:

$ youtube-dl -f 18 https://www.youtube.com/watch?v=FL22h3Qka_c

The info about this format:

$ youtube-dl -F  https://www.youtube.com/watch?v=FL22h3Qka_c | grep 18
18           mp4        640x360    medium , avc1.42001E, mp4a.40.2@ 96k

And then sent it to channel with bot:

bot = telegram.Bot(token=token)
bot.sendVideo(chat_id=chat_id,
    video=video,
    caption=caption,
    duration=duration,
    thumb=thumb)

Video will play very well on Telegram of Android, but when playing on Telegram IOS it's a black screen with voice.

If I save the video to gallery from the channel, the video will be play very well with default video player of IOS.

Also I try to convert video (related issue here) but I have same problem.

Any idea?

Thanks.