It finally finished! int FFMPEG::init_encoder(const char*): mismatch audio/video file format: /dev/shm/av1.webm ---this was due to missing av1 audio opts file----- Render::render_single: Session finished. Render::render_single: Session finished. ** rendered 272 frames in 15931.815 secs, 0.017 fps and this was with just 720x400 frame size! As another data point, just before this experiment I run x265 encode over same region: x265 [info]: HEVC encoder version 3.2.1+1-b5c86a64bbbe x265 [info]: build info [Linux][GCC 5.5.0][32 bit][noasm] 10bit x265 [info]: using cpu capabilities: none! x265 [info]: Main 4:2:2 10 profile, Level-3 (Main tier) x265 [info]: Thread pool created using 4 threads x265 [info]: Slices : 1 x265 [info]: frame threads / pool features : 2 / wpp(7 rows) x265 [warning]: Source height < 720p; disabling lookahead-slices x265 [info]: Coding QT: max CU size, min CU size : 64 / 8 x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra x265 [info]: ME / range / subpel / merge : hex / 57 / 2 / 3 x265 [info]: Keyframe min / max / scenecut / bias: 30 / 30 / 40 / 5.00 x265 [info]: Lookahead / bframes / badapt : 20 / 4 / 2 x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0 x265 [info]: References / ref-limit cu / depth : 3 / off / on x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 / 32 / 1 x265 [info]: Rate Control / qCompress : CRF-28.0 / 0.60 x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip signhide tmvp b-intra x265 [info]: tools: strong-intra-smoothing deblock sao x265 [info]: frame I: 13, Avg QP:24.57 kb/s: 2595.82 x265 [info]: frame P: 66, Avg QP:28.35 kb/s: 167.28 x265 [info]: frame B: 193, Avg QP:35.08 kb/s: 16.89 x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0% x265 [info]: consecutive B-frames: 8.9% 13.9% 2.5% 73.4% 1.3% encoded 272 frames in 56.67s (4.80 fps), 176.64 kb/s, Avg QP:32.95 Render::render_single: Session finished. ** rendered 272 frames in 56.747 secs, 4.793 fps x265 [info]: HEVC encoder version 3.2.1+1-b5c86a64bbbe x265 [info]: build info [Linux][GCC 5.5.0][32 bit][noasm] 10bit x265 [info]: using cpu capabilities: none! x265 [info]: Main 4:2:2 10 profile, Level-3 (Main tier) x265 [info]: Thread pool created using 4 threads x265 [info]: Slices : 1 x265 [info]: frame threads / pool features : 2 / wpp(7 rows) x265 [warning]: Source height < 720p; disabling lookahead-slices x265 [info]: Coding QT: max CU size, min CU size : 64 / 8 x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra x265 [info]: ME / range / subpel / merge : hex / 57 / 2 / 3 x265 [info]: Keyframe min / max / scenecut / bias: 30 / 30 / 40 / 5.00 x265 [info]: Lookahead / bframes / badapt : 20 / 4 / 2 x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0 x265 [info]: References / ref-limit cu / depth : 3 / off / on x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 / 32 / 1 x265 [info]: Rate Control / qCompress : CRF-28.0 / 0.60 x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip signhide tmvp b-intra x265 [info]: tools: strong-intra-smoothing deblock sao x265 [info]: frame I: 13, Avg QP:24.58 kb/s: 2591.60 x265 [info]: frame P: 65, Avg QP:28.29 kb/s: 170.42 x265 [info]: frame B: 194, Avg QP:35.10 kb/s: 16.73 x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0% x265 [info]: consecutive B-frames: 7.7% 14.1% 2.6% 73.1% 2.6% encoded 272 frames in 59.33s (4.58 fps), 176.53 kb/s, Avg QP:32.97 Render::render_single: Session finished. ** rendered 272 frames in 60.858 secs, 4.469 fps As a side question, I wonder if adding frame size/project's colorspace actually implementable (without much effort) idea. (you see, x265/x264 prints their own stats, but other encoders might be not so verbose) May be those 'extended' stats should be hidden behind configuration parameter. (if anyone/anything relies on exact this type of output) So, may be I should use one of those speed tunables in libaom: -cpu-used 8 -tile-columns 1 -tile-rows 0 https://www.streamingmedia.com/Articles/ReadArticle.aspx?ArticleID=130284&pa... Currently testing cpu-used 8 Render::render_single: Session finished. ** rendered 272 frames in 2567.477 secs, 0.106 fps \o/ so, current settings (in Cinelerra): strict=-2 threads=8 cpu-used=8 tile-columns=2 row-mt=true tile-rows=0 On this machine: LANG=C lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 48 bits physical, 48 bits virtual CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 2 Core(s) per socket: 2 Socket(s): 1 Vendor ID: AuthenticAMD CPU family: 21 Model: 2 Model name: AMD FX(tm)-4300 Quad-Core Processor Stepping: 0 CPU MHz: 2585.307 CPU max MHz: 3800.0000 CPU min MHz: 1400.0000 BogoMIPS: 7600.76 Virtualization: AMD-V L1d cache: 16K L1i cache: 64K L2 cache: 2048K L3 cache: 4096K Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold du -h /dev/shm/av1-cpu-used-8.webm 232K /dev/shm/av1-cpu-used-8.webm With libaom as included in Cinelerra. from feb, 1, 2019 (as far as I can see)