Videos are black - just hearing sound

[Tuginho]

On my iOS Device I've some issues with the video playback.
For some reason, the video screen is just black but I can hear the sound.
For the Desktop App it work's well.

[amin3mej]

+1

[ghost]

+1

[andrenarchy]

This issue still exists in the current version when videos were sent from Android.

[FrankBro]

Can reproduce it with a friend. If I send a video (from an Android phone), my friend cannot play the video (on an iOS phone).

[TommasoScalici]

I can reproduce it too, there is any update on this?

[dgigel]

+1

[Overbull]

same problem sending mkv videos from apibot to IOS system, in android or desktop works well.

[cespar]

Same problem, Can we do something to fix it?

[fuomag9]

I can reproduce this too

[mactrash]

Same problem

[henkka]

Can confirm, same happens when I sent from OnePlus 3T (Android 8.0 / Telegram 4.7.1) to my friends iOS.

Anything we can help to resolve this issue?

[Timmy93]

Same problem here! Video Sent from Android 8.1 (OnePlus 5) to iPhone 6S.

[Heash]

There is the same problem. Sending videos from OnePlus 5 to iPhone 7 and it can't play it correctly, only black screen is shown.

[edraac]

I've noticed this several times now and I decided to try it out from several friends' phones, all running the latest Telegram:

• From my OnePlus 3T running Android 8.0: any video I take with either Telegram or the OnePlus Camera app are shown as black in any iPhone I sent it to through Telegram. This also applies to gifs created by Telegram (by turning sound off).
• From a Nexus 6 running Android 8: videos and gifs sent to iPhones work OK.
• From a Pixel 1st gen running Android 9: videos and gifs sent to iPhones work OK.
• From a OnePlus 6 running Android 9: videos and gifs sent to iPhones work OK.

Could this be an issue with Android 8-based OxygenOS (OnePlus) and Telegram?
Has anyone reproduced this on non-OnePlus devices?
Any workarounds?
Anything I can do to help debug this?

[dgigel]

Has anyone reproduced this on non-OnePlus devices?

Same problem on Xiaomi mi 5s (Android 7.0, miui 9.6)

[kolyambo]

Same problem, when I send video to iOS from LG G6 (Android 8.0)

[omidraha]

when I use ffmpeg to convert the video, I have the same problem.

Here is ffmpeg cmd:

ffmpeg -i input.mp4  -framerate 30  -vcodec libx264 -profile:v main -level 3.1 -preset medium -crf 23 -x264-params ref=4 -acodec copy -movflags +faststart -- output.mp4

The converted 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.

Any idea and do you know what is best and valid ffmpeg command to convert a video to playable on Telegram of IOS?

Thanks.