Frame rate & audio sync bad in AVI, 3D images reversed, JPS support

clement5 wrote on 8/26/2020, 7:57 PM

The current 2021 version of Movie Edit Pro still has the same problems with frame rates as the previous versions.  I have reported this several times, to no avail.

The historical NTSC DVD and broadcast rate is exactly 30000/1001 or approximately 29.97.  When a movie is telecined by adding one frame for every four and put on DVD this is the frame rate.  When it is detelecined to get back the original frames the resulting frame rate is exactly 24000/1001.

If I have a detelecined movie that I am restoring, MEP can handle it.  If I output it uncompressed or MP4 the result still has the same frame rate.  I have found that outputting it as an AVI without making any “advanced” selections it also has the same frame rate. 

It I make any advanced selections for outputting an AVI, both the aspect ratio and frame rate are changed.  I can easily fix the aspect ratio, but I cannot completely fix the frame rate.  I can input the approximate frame rate of 23.976, but the resulting video now has the exact frame rate 23976/1000 NOT 24000/1001.  The resulting video also has mis-synchronization between the video and audio at the end of the movie. And I can no longer get back to AVI output with 24000/1001 frame rate. I tried resetting to factory defaults, but that didn't work.

Advanced selections should never change anything except for the specific items changed by the user.  So just changing the codec should NOT change either aspect ratio or frame rate.

In addition, there are some promiscuous changes.  When displaying a 3D side by side video with left image on the left, I used to select Left image first for proper viewing.  Now I have to select right image first.  THIS SHOULD NOT HAVE BEEN CHANGED.  While it is a small annoyance, it is typical of the types of problems that happen in Magix development.  There was another one that happened several generations back where files with the extension JPS are no longer recognized.  A JPS is just a JPG with right and left images stored adjacent to each other as a 3D pair.  JPS should be recognized as being just a JPG. MEP used to understand JPS, but no more. The only way to fix this is to change the extension from JPS to JPG.

I have 16Gb Ram with an Intel i7 processor and a separate Nvidia board. 2021 seems to be faster, but that is not a good substitute for bad output. I routinely use Lagarith compression because I do multiple passes to restore old videos and I don't want to have degradation on each pass. However if I try to output Lagarith AVI, the frame rate problem produces output which does not match and causes subsequent problems. The only way to get matching Lagarith output is to do uncompressed output, then convert to Lagarith using VirtualDub and delete the large uncompressed file. I can go back to the original Intel codec, but the problem is still there. The resulting audio sync produces a delay of a second or 2 between the video and the corresponding audio.

Now I know this does not disturb PAL users, but the historical US formats will still hang around for a long time in the Americas and Japan. Film can be put into any format, but we are stuck with old videos, some of films that have vanished.

 

 

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