Let me walk you through this.
-mod blueplanet2,blueplanet, mediavps_3612
Note the space here? I guess you do, because you put it there for no good reason.
Found root pack '/home/oliver/Freespace2/blueplanet2/adv-bp2.vp' with a checksum of 0x4d6319c8
Found root pack '/home/oliver/Freespace2/blueplanet2/bp2-audio1.vp' with a checksum of 0x4f978a6b
Found root pack '/home/oliver/Freespace2/blueplanet2/bp2-compat.vp' with a checksum of 0x9c7d79f8
Found root pack '/home/oliver/Freespace2/blueplanet2/bp2-core.vp' with a checksum of 0x64e738b9
Found root pack '/home/oliver/Freespace2/blueplanet2/bp2-visuals1.vp' with a checksum of 0xbaa4dbd6
Found root pack '/home/oliver/Freespace2/blueplanet2/bp2-visuals2.vp' with a checksum of 0x9689af32
Found root pack '/home/oliver/Freespace2/blueplanet/adv-bp.vp' with a checksum of 0x670cbd97
Found root pack '/home/oliver/Freespace2/blueplanet/bp-audio1.vp' with a checksum of 0x58f866a1
Found root pack '/home/oliver/Freespace2/blueplanet/bp-audio2.vp' with a checksum of 0x213dcdf3
Found root pack '/home/oliver/Freespace2/blueplanet/bp-compat.vp' with a checksum of 0x6ef45eaf
Found root pack '/home/oliver/Freespace2/blueplanet/bp-core.vp' with a checksum of 0xe5b684cd
Found root pack '/home/oliver/Freespace2/blueplanet/bp-visuals1.vp' with a checksum of 0x1604e6d1
Found root pack '/home/oliver/Freespace2/blueplanet/bp-visuals2.vp' with a checksum of 0xcb7237b9
Found root pack '/home/oliver/Freespace2/root_fs2.vp' with a checksum of 0xce10d76c
Found root pack '/home/oliver/Freespace2/smarty_fs2.vp' with a checksum of 0xddeb3b1e
Found root pack '/home/oliver/Freespace2/sparky_fs2.vp' with a checksum of 0x164fe65a
Found root pack '/home/oliver/Freespace2/sparky_hi_fs2.vp' with a checksum of 0xa11d56f1
Found root pack '/home/oliver/Freespace2/stu_fs2.vp' with a checksum of 0xd77da83a
Found root pack '/home/oliver/Freespace2/tango1_fs2.vp' with a checksum of 0x4c25221e
Found root pack '/home/oliver/Freespace2/tango2_fs2.vp' with a checksum of 0x86920b82
Found root pack '/home/oliver/Freespace2/tango3_fs2.vp' with a checksum of 0x705e8d71
Found root pack '/home/oliver/Freespace2/warble_fs2.vp' with a checksum of 0xd85c305d
See this part? This is where the engine lists all VPs and their checksums (which are completely useless for anything over 2MB in size, btw). See what isn't listed? Correct, any of the mediavps. Know why that is? Because there's no folder called " mediavps_3612" (WITH the leading space you put there) on your system.
Searching root '/home/oliver/.fs2_open/blueplanet2/' ... 24 files
Searching root '/home/oliver/.fs2_open/blueplanet/' ... 0 files
Searching root '/home/oliver/.fs2_open/ mediavps_3612/' ... 0 files
Searching root '/home/oliver/.fs2_open/' ... 1 files
Searching root '/home/oliver/Freespace2/blueplanet2/' ... 1 files
Searching root pack '/home/oliver/Freespace2/blueplanet2/adv-bp2.vp' ... 33 files
Searching root pack '/home/oliver/Freespace2/blueplanet2/bp2-audio1.vp' ... 243 files
Searching root pack '/home/oliver/Freespace2/blueplanet2/bp2-compat.vp' ... 1 files
Searching root pack '/home/oliver/Freespace2/blueplanet2/bp2-core.vp' ... 92 files
Searching root pack '/home/oliver/Freespace2/blueplanet2/bp2-visuals1.vp' ... 682 files
Searching root pack '/home/oliver/Freespace2/blueplanet2/bp2-visuals2.vp' ... 2480 files
Searching root '/home/oliver/Freespace2/blueplanet/' ... 1 files
Searching root pack '/home/oliver/Freespace2/blueplanet/adv-bp.vp' ... 358 files
Searching root pack '/home/oliver/Freespace2/blueplanet/bp-audio1.vp' ... 41 files
Searching root pack '/home/oliver/Freespace2/blueplanet/bp-audio2.vp' ... 683 files
Searching root pack '/home/oliver/Freespace2/blueplanet/bp-compat.vp' ... 1 files
Searching root pack '/home/oliver/Freespace2/blueplanet/bp-core.vp' ... 47 files
Searching root pack '/home/oliver/Freespace2/blueplanet/bp-visuals1.vp' ... 400 files
Searching root pack '/home/oliver/Freespace2/blueplanet/bp-visuals2.vp' ... 1561 files
Searching root '/home/oliver/Freespace2/ mediavps_3612/' ... 0 files
Searching root '/home/oliver/Freespace2/' ... 474 files
Searching root pack '/home/oliver/Freespace2/root_fs2.vp' ... 157 files
Searching root pack '/home/oliver/Freespace2/smarty_fs2.vp' ... 10 files
Searching root pack '/home/oliver/Freespace2/sparky_fs2.vp' ... 3027 files
Searching root pack '/home/oliver/Freespace2/sparky_hi_fs2.vp' ... 1337 files
Searching root pack '/home/oliver/Freespace2/stu_fs2.vp' ... 2355 files
Searching root pack '/home/oliver/Freespace2/tango1_fs2.vp' ... 32 files
Searching root pack '/home/oliver/Freespace2/tango2_fs2.vp' ... 15 files
Searching root pack '/home/oliver/Freespace2/tango3_fs2.vp' ... 10 files
Searching root pack '/home/oliver/Freespace2/warble_fs2.vp' ... 52 files
Now look at this part. This is where the engine goes through all mod directories and the base directory and enumerates all "loose" files (that is, files not in a .vp archive). I would like to direct your attention to this line specifically:
Searching root '/home/oliver/Freespace2/ mediavps_3612/' ... 0 files
Do you see what is happening here? The mediavps are NOT loaded, because the directory " mediavps_3612" does not exist.
Which directly leads to this:
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTF Aurora" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTF Kulas" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTF Comanche" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTF Seminole" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTF Cherokee" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTB Yurok" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class GTB Navajo" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class GTC Hyperion" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class GTCv Chimera" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class GTCv Bellerophon" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class GTD Titan" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class GTD Raynor" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class GTL Anemoi" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class Orion Refit" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class Alliance Jump Gate" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class Spacesuit" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class SJ Dante" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class Vishnan Preserver" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class Vishnan Arbiter" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class Vishnan Sacred Keeper" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class Vishnan Missionary" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class Vishnan Preacher" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class Vishnan Seeker" at ship.cpp:2533
WARNING: "Invalid armor name LightArmor specified for hull in ship class Vishnan Inquisitor" at ship.cpp:2533
WARNING: "Invalid armor name MediumArmor specified for hull in ship class Vishnan Protector" at ship.cpp:2533
WARNING: "Invalid armor name HeavyArmor specified for hull in ship class UEFg Karuna#AoA" at ship.cpp:2533
because those are defined in mv_effects-amr.tbm, a file only found in mv_effects.vp, and this:
WARNING: "Unable to find WEAPON_LIST_TYPE string "Hornet#Shivan" in ship: SC Asura." at parselo.cpp:2707
WARNING: "Unable to find WEAPON_LIST_TYPE string "Hornet#Shivan" in ship: SC Asura." at parselo.cpp:2707
because the #shivan variant weapons are only defined in mv_effects.vp,
WARNING: "Couldn't open texture 'blue_glow4_small' referenced by model 'UEDSolaris.pof'" at modelread.cpp:1815
because mv_assets.vp is missing,
and finally ASSERTION: "ti->texture.bitmap_id != -1" at trails.cpp:193 Weapon trail Flak_trail could not be loaded
which is also found in mv_effects.
The secondary lines in the mod.ini are the way they are because they need to be. They are completely correct, and unless you know what you are doing and what it's going to do, you should not tamper with them.
Your issue can probably be solved by simply deleting mv_music.vp, and deleting the data directory in the MediaVPs folder (if it exists), and restoring the BP mod.inis to their previous state.