I'm from Singapore. Ah... I saw some post and it was mentioned that citizens from certain countries like from Africa and those region can't apply visa through the embassy around Asia and need to go back their home country to apply.
2. 200thb mini van to Nongkhai border. Reach around 8.15am.
3. Stamp out from Thailand, got a 20thb ticket to cross to Laos border.
4. Spent 5thb to buy an exit card, filled up immigration card while queuing.
5. Cleared Laos border by 8.30am. Badgered by taxi touts. Got a vehicle for 200thb, bargained from 300thb.
6. Reach Thai consulate at 9.15am. Ask the nice people inside to fill form for me for 55thb and copy my incoming Laos stamp.
7. Queued for 40mins and got queue number 151.
8. Waited for another hour to verify my documents.
9. By 11.30am was out of consulate.
10. Next day. 1330 hrs arrived at embassy. Queue was moving at 25 numbers per 15 mins. Got my passport back after waiting an hour-ish. (Pay the officer as requested on receipt)
11. Out of embassy, shared a mini van with 2 chaps and headed to border.
12. Free exit plastic card as i arrived before 4pm.
13. Stamped out and reached Nongkhai at 3.45pm.
14. Paid 150thb for mini van to airport. Reached around 5pm.
Documents needed as per my post. They do really need to see your original marriage cert and a letter from your spouse helps too. No income letter is required.