[FFmpeg-user] remux AVI (H.264+MP3) to MP3 causes problems in browser; Missing PTS timestamps

[Ben]

I have videos in AVI format which contain MP3 and H.264 encoded videos.

I can play them successfully on my local Windows computer with videoplayers tools like VLC

Now I remux (without new encoding) them with the following ffmpeg command to MP4 container :

Fmpeg.exe  -i test.avi -acodec copy -vcodec copy -map 0 test_out.mp4

I still can play the successfully  on my local Windows computer with videoplayers tools like VLC


Afterwards I uploaded them to a remote server and launched them in browser.

Unfortuntely when I call these videos now in browser then

- Firefox v64.0 plays no audio (only video)
- Chrome plays audio but video is stuttering.

So there is a bug in video remxuing of ffmpeg.

During problem investigation I dragged the MP4 video onto the well know Avidemux converter tool and got the following warning prompt:

"The video contains B-frames, but prestentation time stamp (PTS) are either missing or monotonically increased.
Avidemux can try to reconstruct correct PTS by decoding the entire video. This may take a lot of time. Proceed?"

I clicked OK, then saved (un-reencoded the new MP4), uploaded it again...and playing works in both browser (Firefox and Chrome)
successfuly.

So again: remuxing in ffmpeg has a bug with PTS

Is there a way to remux correctly from AVI to MP4 container?

Thank you
Ben