The obvious solution is to re-encode legacy formats into modern formats so they are playable on the modern device.
Post
RE: LE10 & deinterlacing in RPi4
(Quote from chewitt)
Hi , Just tested 9.95.2 and found out that de-interlacing is not available yet. (Clearly "alpha" fits the description
)
I just want to make sure you know de-interlacing is Top priority for PVR usage (and even playing old DVDs).
Not only without de-interlacing the playback is jaggy we are viewing it half fps which make a lot of content unwatchable.
While saying that keep up the great work and hoping to se de-interlacing support gets bumped up (I can help with testing if…
Hi , Just tested 9.95.2 and found out that de-interlacing is not available yet. (Clearly "alpha" fits the description

I just want to make sure you know de-interlacing is Top priority for PVR usage (and even playing old DVDs).
Not only without de-interlacing the playback is jaggy we are viewing it half fps which make a lot of content unwatchable.
While saying that keep up the great work and hoping to se de-interlacing support gets bumped up (I can help with testing if…