I made a home 45 min video of myself giving a presentation on a physics topic using my iphone 6. The format is quicktime .MOV - about 2.6 GB. I converted it to .mp4 using a software avidemux.

After that I used a linux utility ffmpeg and used a 'drawtext' feature to add relevant text/equations at relevant portions of my video. This is a .mpeg-4 to .mpeg-4 with little change in size I understand it may be similar to a hard-sub with re-endcoding (I don't understand what is re-encoding). I uploaded it to youtube and China's youku and everything was working find.

I then made a post in China's Weibo (an equivalent to Twitter) with a link to my youku video. I got a surprise! The video plays perfectly, but somehow all the text that I added with 'drawtext' disappeared. I don't understand.

I know that Weibo is heavily censored, but I can't understand if somehow they would go to this extend. They might as well take away my audio track or delete my video link.

I ask a relative of mine who has a B.Sc in computer science and he told me there are ways using AI neural network to remove texts from my video. The text from my video is very clear with blue and a ttf font style.

Can someone confirm this is what Weibo did to my video, censoring all the texts. If true, how could I redo my video so that no one could remove the texts. I have the original .MOV files

Removing the text, although possible, doesn't seem like the simplest explanation.

Can anyone HERE 'confirm' it? No....the only ones who can would be Weibo; have you asked them? And how did you add the subtitles to your video? Because if you added them with a 'standard' .SRT subtitles file, it could be that the player doesn't support whatever subtitle format you used. Or you have subtitles turned off.

You can re-encode a video file with the subtitles burned in, so that you can't turn them on/off. Or (surprise), you could post your video somewhere else where the web and most other things are censored.