How to detect interlace type in MP4 file?

[Kolich]

How to detect interlace type in MP4 file?
for h264 and mpeg4. does mp4 structure contain such information or it is needed to parse video frames?
:thanks:

[mediator]

you need to parse the stream. There is no interlacing vs. progressive information in the container.

[Kolich]

thanks. i also think that there is no other solution