Jan
sorry about your stolen camera, know how you feel having lost similar in Spain, long time ago now.
Galapagos takes me back to 2011 when we visited, sounds like you have same interests other than the diving.
We had a safari trip booked to Namibia, postponed because of Covid, rearranged for Feb 2022, this week we find the trip is cancelled as company has gone into liquidation. Very disappointing.
Rendering quality should retain the original video quality provided we use the same settings as the original.
We should also set the project properties to the same settings, where possible.
Of course converting from one format to another can result in lower quality but again using similar settings is recommended. Take care with video types – field order – progressive or Interlaced.
Burning a DVD
A video DVD has to use Mpeg2 standard definition, for NTSC, 720 x 480 at 29.97fps the frame type here is also important as interlacing could be used, Upper or Lower field First.
What were the properties of the video used to burn the DVD, I assume HD MP4 or Mov, If your original video is using a progressive frame type the burning process may convert that to Upper Field and that will cause quality issues.
Of course the original may be using 1920 x 1080 resolution, which will also be scaled down to 720 x 480 reducing quality.
So a little more care in controlling the settings when burning a DVD
If the original video was either DV-Avi or Mpeg2 would prove easier to manage when burning a disc.
To avoid creating those coasters I always create a disc image, that saves the DVD to an ISO file, we can play using VLC Media player, and if quality is ok burn the ISO to disc.
Your best option is to render the project to Mpeg2 using appropriate settings
Then use the new Mpeg2 to burn the disc, or rather Iso then to disc
Some details regarding DVD workflows, also includes Bluray
http://lata.me.uk/corel/all.htm
Mov re Mpeg4…. Should not be to much of a problem, again provided same / similar settings are used. MP4 video was in fact first created from Mov, many years ago, some older types can have there extension changed from Mov to MP4 and still work, may not work for the newer types used nowadays.
To help in retaining the original settings the program does use the Messages option to match the project properties, then from Share - Same as First Video Clip or Same as Project Settings can be used.