LFE Track is removed from output

[ste2w]

so i have a question ive noticed that some files i have run through other_video_transcoding that have 7.1 or even 5.1 surround after i process them the lfe track is removed and Media Info reports that it has 5 channels after finishing instead of 6 and the files that were produced from makemkv show 5,1 or 7.1 flac and i apologize if i haven't made myself clear but is it something that ive done wrong cause my command line is (other-transcode --hevc --eac3 "Path to movie" ) or is it a bug in the new version im not trying to sound rude or anything i haven't had this happen before i'm just curious have a great day and i hope that i explained it clearly enough :)

[lisamelton]

@ste2w I'm sorry you're having this problem. Normally the LFE track should not be removed even mixing 7.1 down to 5.1, which is the default behavior for DD+ (E-AC-3) output.

But to diagnose this, I need a lot more information.

Could you start by attaching some of the .log files from the problem transcodes to this issue. Thanks.

[ste2w]

free.mkv.log midway.mkv.log

is this the right stuff? I've never done this before so i hope it is if not i can run the encode again if there is something im missing let me know what I'm missing thanks!

[lisamelton]

@ste2w Yes, that's the right stuff.

Your .log files show that you're using ffmpeg version N-108460-g5c94b6694a-20221002. Where did you get that? Is that a nightly/developer build? If so, can you please use a released version instead?

[ste2w]

i oownloaded it from the ffmoeg website under the windows build whatever the latest version was is it not what they said?? im confused lol that was supposed to be the latest released build

[ste2w]

but yeah i will try and find a released build and try it again :)

[ste2w]

free.mkv.loghere is an updated log with a new version installed :)

[lisamelton]

@ste2w Thanks, but that also appears to be a nightly/developer build: ffmpeg version N-108614-g37ee36f689-20221011.

Which website are you downloading from?

Try this website:

https://www.gyan.dev/ffmpeg/builds/

..and look for the "release builds" section:

This link should work for you:

https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full.7z

[lisamelton]

@ste2w Nevermind. I see the problem. Something changed in a recent release of ffmpeg that's no longer mapping audio channels correctly by default when the input has more than 6 channels. I'll take it from here. Stay tuned...

[ste2w]

oh! alright i just got it installed thanks for the help btw! :)

[lisamelton]

I think the change happened in version 5.1. Trying to narrow it down...

[ste2w]

if there is anything i can do to help just let me know :)

[lisamelton]

@ste2w Thanks! I may have you test a fix once I have a patch ready. Stay tuned...

[ste2w]

yeah sure will do! :)

[lisamelton]

@ste2w OK, I have a patch. I'm just doing some more testing before I check it in...

[ste2w]

ready when ever you are :) how do i install patches is it just an update through ruby or is it something i download and then just copy and replace the files??

[lisamelton]

@ste2w Good questions! I've checked in a fix for the bug into the other-transcode source file on GitHub but I haven't packaged and released an updated Gem yet. So, you can't use gem update to test a fix. But you can download the other-transcode source file, rename it to other-transcode.rb and execute it locally. Does that make sense?

[ste2w]

kinda im new to all of this sorry! ive never done anything like this before so would i load the other-transcode.ro into a command prompt and run the same parameters as normal? as in (other-transcode.ro --hevc --eac3 "Path to movie")

[lisamelton]

@ste2w Yes. But the file extension needs to be .rb, not .ro.

[ste2w]

oh my bad yeah i have a small screen lol i think i got it running ill post a log and hope i did it right lol thanks again for the help ill update shortly :)

[ste2w]

alright here is the log file after the patch :) Free.mkv.log

[ste2w]

it looks like it worked thank you again ill go ahead and close this out! have a great night! :D

[lisamelton]

@ste2w Thanks for testing! I'm re-opening the issue. I'll close it once the fix is released.

[ste2w]

im happy to help! glad i could be of some assistance lol and alright sounds good!

[lisamelton]

@ste2w Yes, I really appreciate you letting me and the development team know about the problem and the change to ffmpeg. And thanks for using other-transcode!

[lisamelton]

@ste2w OK, I have now released the Gem. Just gem update other_video_transcoding and you're good to go.

Thanks again for your help!

[catdroid75]

THANK YOU. I've been trying to track down what's been causing this, assumed I had screwed up somewhere. All of my encodes that had TrueHD / Atmos tracks were coming out without the LFE. I had started considering just keeping the original track on everything... this is better!

[lisamelton]

@catdroid75 You are very welcome! Sorry it took over a week to notice that change to FFmpeg. I'm really glad @ste2w gave us the heads up on it.

[ste2w]

hey! i didnt know i could comment after this was closed! lol @catdroid75 im glad i wasnt the only one who had this problem i was really confused to dont worry haha and @donmelton im glad i can help out if yall ever need like a beta tester or anything i would be happy to help in any way i can! i love bein able to help out with stuff like this :) my knowledge is limited i will admit but im open to learning as well :D

[lisamelton]

@ste2w Thanks! I will keep that in mind, sir. 👍