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A Note About Remuxing Audio with Framerate Change
#1
This may be common knowledge to most, but I figured it might be worth noting. The last two syncs I did both had 24 FPS video sources while the audio was from a 23.976. Since preservation is the name of our game I didn't want to alter the audio, so I chose to change the video framerate instead. This can be easily done with MKVToolnix when you remux with the video by setting Default Duration/FPS to 24000/1001.

Here's the thing though - that option is only setting the MKV container parameter, not the framerate actually embedded in the video stream. For most PC players that might actually be enough, but I ran into the problem where my main player was ignoring it and using the one in the stream. Luckily, we can also alter that without re-encoding by checking the box labeled Fix bitstream Timing info. With these two set, you should be good to go on any player Smile

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Thanks given by: crampedmisfit1990 , TomArrow , sertoli
#2
I appreciate this guide. I use MKVToolnix a lot, especially lately and it is helpful info. Thanks!
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#3
Note: it can be done easily also on TSmuxeR, if you ever need the file to be muxed into a .ts or .m2ts - for Blu-ray.
Sadly my projects are lost due to an HDD crash... Sad
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#4
The better way to change the video framerate is in the element stream rather than the container. One easy way to do this is with My MP4 Box gui - take your video stream, and set the fps and mux to .mp4. Then take the resulting .mp4 and re-mux the video file into your mkv container.
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#5
or

eac3to source destination -slowdown

Wink
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#6
I thought -slowdown is only for 25fps, pal speeddown. Shouldn't it be -24.000 -changeTo23.976?.

Bronan, if you want to keep all the other tracks from the 4k bluray of the The Fog, I assume all of them need slowing down as well including sup and also don't the chapters need manuallly re-timing?.
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#7
-slowdown will output 23,976fps regardless of original frame-rate
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#8
This is awesome. I knew I can set it but I didn't know about the "fix bitsream timing info". Very useful!
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#9
(2019-04-06, 11:43 AM)Valeyard Wrote: The better way to change the video framerate is in the element stream rather than the container. One easy way to do this is with My MP4 Box gui - take your video stream, and set the fps and mux to .mp4. Then take the resulting .mp4 and re-mux the video file into your mkv container.

Isn't that the reason why he mentions that "fix bitstream timing info" checkbox? Or is that something different again?
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#10
Yea, that's what I was going to say, it's the hidden fix bitstream timing info that is most important. I highlighted it up above so you can't miss it now Smile
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