TelegramMessenger / TelegramMessenger/Telegram-iOS

Critical bug in video playback

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Dominant language
Swift
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Description

Some videos are played VERY badly. See the files in this channel for examples:

https://t.me/t12345623

I have tested this in the iPhone version, too, it is exactly like the iPad version.

Telegram screenshot (the video zooms in and a lot of the content is not visible):
C9CF2626-A5E8-4AED-BFD3-25EC7290D767

If using the nonfullscreen mode, the video becomes 1:1 ratioed, which is awful:
B5D5AB73-0A68-48AB-A3BA-FA679DD6D4BE

The same file in VLC:
04F9BE4C-5DEB-43A7-8F1B-AB627D86A5D8

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source files, tests, or entry points are identified. Reproduce the linked Telegram video on iPhone and iPad in fullscreen and nonfullscreen modes, compare it with VLC, and confirm that playback preserves the video's aspect ratio and keeps its content visible.

Written by the indexing model from the issue text.

Assessment

Tech stack
swift
Domain
audio-video-rtc, mobile-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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