Dv fixes

[szasza576]

Hi, Here are two small corrections to the script.

• The first adds a precheck to the chapter.list generation. Without this that line generates a dummy file with errorous content and the MP4box fails later.
• The second adds the DV compatibility to after the DV target in the MP4box. If I tried to convert a file with profile 8 it required the compatibility and otherwise it dropped this error: DV profile 8 must indicate a compatibility mode hdr10 or bt709

[gacopl]

so thanks for pointing out these two things as asm is optional it breaks chapters generation thats true i forgot about it before asm was not optional.

2nd the error you get is because you are using newer version of mp4box 2.0 please install version from README, as new version has its downsides OLED C8 compatibility and more unsuccessful muxes in general

Your PR would break the compatibility with destined version of MP4Box so i will not merge it, i will provide fix for ASM in upcoming version generally if you run with -a switch always you will not have an issue, there is existing precheck for chapters output existence

So thanks for contribution and bringing my attention to this

[szasza576]

Ahh, indeed I had a newer version. I missed that. Thanks for the feedback.