Architecture — TSC TranSCoder Stream Manager

Absolute VMAF of the live chain: each channel's source against its own program at the mux output — actual NVENC encoders, actual statmux, captured while all 31 transcodes run on one saturated RTX 5070 Ti (NVDEC 100 %). Not a lab excerpt — the whole line-up under load. 28 of 31 channels; alignment PSNR 31–50 dB.

Mux 1 ⌀ 90.3

38.8 Mbps · 13 ch

Channel	VMAF	1%	kbps
JOJ Plus	96.8	93	3165
TA3	95.3	92	2446
Auto Moto Und Sport	94.0	87	3075
RTVS jednotka	93.5	82	3039
ČT 24	93.4	88	2368
Markíza Klasik	92.6	80	2783
JOJ	92.4	80	2563
Doma	91.6	80	2682
Markíza	89.7	77	2853
RTVS dvojka	89.4	84	2636
JOJ Šport	89.2	78	2266
RTVS sport	84.8	62	3679
JOJ svet*	71.5	41	2862

Mux 2 ⌀ 92.9

31 Mbps · 11 ch

Channel	VMAF	1%	kbps
ČT 1	95.5	90	4133
ČT 2	94.2	87	4807
Nova Fun	94.2	91	3448
Nova Action	94.1	85	2464
Prima ZOOM	92.9	72	4101
ČT sport	92.1	77	5024
Nova Cinema	90.7	71	1786
Nova HD	89.3	60	1915

Mux 3 ⌀ 95.6

31 Mbps · 7 ch

Channel	VMAF	1%	kbps
Film Box HD	97.6	94	4177
JOJ Cinema HD	96.3	91	3340
NATGEO	96.0	84	4216
PrimaKrimi	95.8	87	3894
Prima HD	95.1	78	4859
Prima MAX HD	95.1	87	4344
Prima COOL	93.2	80	4801

VMAF = mean · 1% = 1st-percentile frames (worst moments) · higher is better.Quality tracks content difficulty, not bitrate: TA3 scores 95.3 on 2.4 Mbps while live sport needs 3–4 Mbps for less — exactly what statmux redistributes.* JOJ svet — repeated captures were contaminated by boot transients under saturation; the number is indicative.3 free HLS feeds (Al Jazeera, DW, Red Bull) excluded — their mux feed carries video only intermittently (a separate production issue, not a measurement one).