MP4 and MPEG transport stream organise compressed media differently. Transport streams have a history in broadcast delivery, while MP4 is common in files and modern segmented streaming. Neither container alone guarantees better picture quality, lower delay or compatibility with a particular player.
Separate delivery from the picture
The same compressed video can sometimes be packaged in different containers without changing the picture samples. If two streams look different, investigate their actual video encoding and rendition rather than crediting the extension immediately. The container affects how media is organised, not whether the camera captured more detail.
Account for the player
A player needs a suitable demultiplexer to read the packaging and appropriate decoders for the tracks inside. One app may handle a particular live transport stream more reliably than another. Conversely, a browser may expect a supported segmented format or media pipeline rather than accepting every raw transport stream URL.
Report failures precisely
If playback starts then loses synchronisation, record whether the issue happens after a channel change, a seek or a network interruption. If it never opens, note the error and whether an authorised alternative container is available. Avoid posting private stream URLs because they may contain account tokens or credentials.