Пытаясь сжать последний бит, я обнаружил, что мои файлы становятся больше, чем меньше. К сожалению, я, должно быть, неправильно истолковал некоторые параметры.
Возможно ты можешь помочь мне.
Ссылка -preset placebo:
ffmpeg -y -hide_banner -i <input.mp4> \ [... audio ...] \ -pix_fmt yuv420p \ -preset placebo \ -crf 30 \ -codec:v libx265 \ -f mp4 \ -movflags +faststart+disable_chpl \ <output.mp4> Результирующий размер файла составляет 130,780,586 байт.
Затем я прочитал документацию и попытался понять значение параметров.
Потом я использовал
ffmpeg -y -hide_banner -i <input.mp4> \ [... audio ...] \ -pix_fmt yuv420p \ -preset placebo \ -crf 30 \ -x265-params "ssim=0:psnr=0:frame-threads=1:pools=*:wpp=0:pmode=0:pme=0:slices=1:copy-pic=1:level-idc=0:high-tier=1:ref=6:allow-non-conformance=0:uhd-bd=0:rd=6:ctu=64:min-cu-size=8:limit-refs=0:limit-modes=0:rect=0:amp=0:early-skip=0:rskip=0:splitrd-skip=0:fast-intra=0:b-intra=1:cu-lossless=1:tskip-fast=0:rd-refine=1:rdoq-level=1:tu-intra-depth=4:tu-inter-depth=4:limit-tu=0:nr-intra=0:tskip=0:rdpenalty=0:max-tu-size=32:dynamic-rd=0:ssim-rd=1:max-merge=5:me=full:subme=7:merange=32767:temporal-mvp=1:weightp=1:weightb=1:analyze-src-pics=1:strong-intra-smoothing=1:constrained-intra=0:psy-rd=2.0:psy-rdoq=1.0:open-gop=1:keyint=15000:min-keyint=2:scenecut=40:scenecut-bias=5:ctu-info=0:intra-refresh=0:rc-lookahead=250:lookahead-slices=0:lookahead-threads=0:b-adapt=2:bframes=16:bframe-bias=0:b-pyramid=1:force-flush=0:crf-max=51.0:crf-min=0.0:vbv-bufsize=0:vbv-maxrate=0:vbv-init=0.0:vbv-end=0.0:vbv-end-fr-adj=0:lossless=0:aq-mode=3:aq-strength=1.0:aq-motion=1:qg-size=8:cutree=1:strict-cbr=0:signhide=1:sao=1:sao-non-deblock=0:limit-sao=0:opt-qp-pps=1:opt-ref-list-length-pps=1:opt-cu-delta-qp=1" \ -codec:v libx265 \ -f mp4 \ -movflags +faststart+disable_chpl \ <output.mp4> Полученный размер файла составляет 300,468,224 байта.
Видимо визуальное качество лучше. Но я думал, что это должно быть постоянным из-за -crf 30. Должен ли я уменьшить переменную скорость передачи данных путем увеличения -crf?
Для лучшей читаемости параметров снова:
-x265-params " ssim=0: psnr=0: frame-threads=1: pools=*: wpp=0: pmode=0: pme=0: slices=1: copy-pic=1: level-idc=0: high-tier=1: ref=6: allow-non-conformance=0: uhd-bd=0: rd=6: ctu=64: min-cu-size=8: limit-refs=0: limit-modes=0: rect=0:amp=0: early-skip=0: rskip=0: splitrd-skip=0: fast-intra=0: b-intra=1: cu-lossless=1: tskip-fast=0: rd-refine=1: rdoq-level=1: tu-intra-depth=4: tu-inter-depth=4: limit-tu=0: nr-intra=0: tskip=0: rdpenalty=0: max-tu-size=32: dynamic-rd=0: ssim-rd=1: max-merge=5: me=full: subme=7: merange=32767: temporal-mvp=1: weightp=1: weightb=1: analyze-src-pics=1: strong-intra-smoothing=1: constrained-intra=0: psy-rd=2.0: psy-rdoq=1.0: open-gop=1: keyint=15000: min-keyint=2: scenecut=40: scenecut-bias=5: ctu-info=0: intra-refresh=0: rc-lookahead=250: lookahead-slices=0: lookahead-threads=0: b-adapt=2: bframes=16: bframe-bias=0: b-pyramid=1: force-flush=0: crf-max=51.0: crf-min=0.0: vbv-bufsize=0: vbv-maxrate=0: vbv-init=0.0: vbv-end=0.0: vbv-end-fr-adj=0: lossless=0: aq-mode=3: aq-strength=1.0: aq-motion=1: qg-size=8: cutree=1: strict-cbr=0: signhide=1: sao=1: sao-non-deblock=0: limit-sao=0: opt-qp-pps=1: opt-ref-list-length-pps=1: opt-cu-delta-qp=1" Выход из placeboпрогона:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '<input.mp4>': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 creation_time : 2018-03-25T07:58:52.000000Z Duration: 00:07:03.46, start: 0.000000, bitrate: 207200 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 207062 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : ?Mainconcept Video Media Handler encoder : AVC Coding Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 157 kb/s (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : #Mainconcept MP4 Sound Media Handler Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265)) Stream #0:1 -> #0:1 (aac (native) -> aac (native)) Press [q] to stop, [?] for help x265 [info]: HEVC encoder version 2.6 x265 [info]: build info [Linux][GCC 7.2.0][64 bit] 8bit+10bit+12bit x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 x265 [info]: Main profile, Level-4 (Main tier) x265 [info]: Thread pool created using 8 threads x265 [info]: Slices : 1 x265 [info]: frame threads / pool features : 3 / wpp(17 rows) x265 [info]: Coding QT: max CU size, min CU size : 64 / 8 x265 [info]: Residual QT: max TU size, max depth : 32 / 4 inter / 4 intra x265 [info]: ME / range / subpel / merge : star / 92 / 5 / 5 x265 [info]: Keyframe min / max / scenecut / bias: 24 / 250 / 40 / 5.00 x265 [info]: Lookahead / bframes / badapt : 60 / 8 / 2 x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 1 x265 [info]: References / ref-limit cu / depth : 5 / off / off x265 [info]: AQ: mode / str / qg-size / cu-tree : 1 / 1.0 / 32 / 1 x265 [info]: Rate Control / qCompress : CRF-30.0 / 0.60 x265 [info]: tools: rect amp rd=6 psy-rd=2.00 rdoq=2 psy-rdoq=1.00 tskip x265 [info]: tools: signhide tmvp b-intra strong-intra-smoothing deblock sao Output #0, mp4, to '<output.mp4>': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 encoder : Lavf57.83.100 Stream #0:0(eng): Video: hevc (libx265) (hev1 / 0x31766568), yuv420p(progressive), 1506x1080 [SAR 1:1 DAR 251:180], q=2-31, 24 fps, 12288 tbn, 24 tbc (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : ?Mainconcept Video Media Handler encoder : Lavc57.107.100 libx265 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 48 kb/s (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : #Mainconcept MP4 Sound Media Handler encoder : Lavc57.107.100 aac [mp4 @ 0x558418671660] Starting second pass: moving the moov atom to the beginning of the file frame=10162 fps=0.1 q=-0.0 Lsize= 127715kB time=00:07:03.43 bitrate=2470.8kbits/s speed=0.00405x video:124915kB audio:2502kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.233744% x265 [info]: frame I: 58, Avg QP:32.08 kb/s: 3827.66 x265 [info]: frame P: 1838, Avg QP:33.65 kb/s: 3792.41 x265 [info]: frame B: 8266, Avg QP:36.26 kb/s: 2100.06 x265 [info]: Weighted P-Frames: Y:7.0% UV:7.0% x265 [info]: Weighted B-Frames: Y:18.1% UV:17.6% x265 [info]: consecutive B-frames: 4.7% 3.3% 11.0% 20.1% 16.9% 12.9% 10.2% 9.7% 11.2% encoded 10162 frames in 104535.21s (0.10 fps), 2416.02 kb/s, Avg QP:35.76 [aac @ 0x5584186c0220] Qavg: 156.304 И вывод преувеличенного прогона:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '<input.mp4>': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 creation_time : 2018-03-25T07:58:52.000000Z Duration: 00:07:03.46, start: 0.000000, bitrate: 207200 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 207062 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : ?Mainconcept Video Media Handler encoder : AVC Coding Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 157 kb/s (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : #Mainconcept MP4 Sound Media Handler Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265)) Stream #0:1 -> #0:1 (aac (native) -> aac (native)) Press [q] to stop, [?] for help x265 [info]: HEVC encoder version 2.6 x265 [info]: build info [Linux][GCC 7.2.0][64 bit] 8bit+10bit+12bit x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 x265 [info]: Main profile, Level-4 (Main tier) x265 [info]: Slices : 1 x265 [info]: frame threads / pool features : 1 / none x265 [info]: Coding QT: max CU size, min CU size : 64 / 8 x265 [info]: Residual QT: max TU size, max depth : 32 / 4 inter / 4 intra x265 [info]: ME / range / subpel / merge : full / 32767 / 7 / 5 x265 [info]: Keyframe min / max / scenecut / bias: 2 / 15000 / 40 / 5.00 x265 [info]: Lookahead / bframes / badapt : 250 / 16 / 2 x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 1 x265 [info]: References / ref-limit cu / depth : 6 / off / off x265 [info]: AQ: mode / str / qg-size / cu-tree : 3 / 1.0 / 8 / 1 x265 [info]: Rate Control / qCompress : CRF-30.0 / 0.60 x265 [info]: tools: rd=6 ssim-rd psy-rd=2.00 rdoq=1 psy-rdoq=1.00 rd-refine x265 [info]: tools: cu-lossless signhide tmvp b-intra strong-intra-smoothing x265 [info]: tools: deblock sao Output #0, mp4, to '<output.mp4>': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 encoder : Lavf57.83.100 Stream #0:0(eng): Video: hevc (libx265) (hev1 / 0x31766568), yuv420p(progressive), 1506x1080 [SAR 1:1 DAR 251:180], q=2-31, 24 fps, 12288 tbn, 24 tbc (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : ?Mainconcept Video Media Handler encoder : Lavc57.107.100 libx265 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 48 kb/s (default) Metadata: creation_time : 2018-03-25T07:58:52.000000Z handler_name : #Mainconcept MP4 Sound Media Handler encoder : Lavc57.107.100 aac [mp4 @ 0x564f7705a760] Starting second pass: moving the moov atom to the beginning of the file frame=10162 fps=0.1 q=-0.0 Lsize= 293426kB time=00:07:03.43 bitrate=5676.7kbits/s speed=0.00402x video:290747kB audio:2502kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.060220% x265 [info]: frame I: 34, Avg QP:28.44 kb/s: 8462.33 x265 [info]: frame P: 1710, Avg QP:31.95 kb/s: 6614.87 x265 [info]: frame B: 8418, Avg QP:32.51 kb/s: 5411.77 x265 [info]: Weighted P-Frames: Y:7.0% UV:6.8% x265 [info]: Weighted B-Frames: Y:18.4% UV:17.2% x265 [info]: consecutive B-frames: 5.6% 3.6% 11.8% 22.0% 17.3% 11.6% 7.3% 5.3% 2.9% 1.9% 1.5% 2.2% 0.8% 0.9% 0.7% 1.5% 2.9% encoded 10162 frames in 105460.05s (0.10 fps), 5624.43 kb/s, Avg QP:32.40 [aac @ 0x564f770d19e0] Qavg: 156.304 Спасибо за чтение!