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SPIP - plugins - embed code - Exemple
2 septembre 2013, par
Mis à jour : Septembre 2013
Langue : français
Type : Image
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Publier une image simplement
13 avril 2011, par ,
Mis à jour : Février 2012
Langue : français
Type : Video
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Ecrire une actualité
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Sur d’autres sites (6993)
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Transcoding HEVC 4K HDR using ffmpeg and vaapi
13 mai 2021, par P. BrandI am trying to transcode a 4K HEVC HDR video to a lower bitrate using ffmpeg and VAAPI hardware acceleration for my LG OLED television.



I use the following file :
Video



Using the following command :



ffmpeg -init_hw_device vaapi=va:/dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device va -filter_hw_device va -i LG\ 4K\ HDR\ Demo\ -\ Daylight.mkv -map 0:0 -t 00:00:20 -c:v hevc_vaapi -sei hdr -qp:v 21 lg_vaapi.mkv



But this file is not recognized as HDR on my TV.



When using the libx265 encoder (which is off course much slower) it works fine :



ffmpeg -i LG\ 4K\ HDR\ Demo\ -\ Daylight.mkv -t 00:00:20 -map 0:0 -c:v libx265 -preset medium -crf 18 -x265-params "colorprim=bt2020:colormatrix=bt2020nc:transfer=smpte2084:colormatrix=bt2020nc:hdr=1:info=1:repeat-headers=1:master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(11000000,40)" lg_libx265.mkv



When comparing the output of mediainfo on both files I can see the following properties are not set for the video track :



- 

- Color range
- Color primaries
- Transfer characteristics









mediainfo for vaapi encode :



General
Unique ID : 168011494166392912924249315217763643529 
(0x7E65D636029A5354FE73998A5ED6B089)
Complete name : lg_vaapi.mkv
Format : Matroska
Format version : Version 4
File size : 118 MiB
Duration : 20 s 4 ms
Overall bit rate : 49.6 Mb/s
Writing application : Lavf58.20.100
Writing library : Lavf58.20.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5@Main
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 20 s 4 ms
Bit rate : 48.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.098
Stream size : 116 MiB (98%)
Writing library : Lavc58.35.100 hevc_vaapi
Default : Yes
Forced : No
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0040 cd/m2, max: 1100 cd/m2



mediainfo for the libx265 encode :



General
Unique ID : 261605749278874425324960669956061374077 (0xC4CF6F42FE952004772A02D5819DA67D)
Complete name : lg_libx265.mkv
Format : Matroska
Format version : Version 4
File size : 155 MiB
Duration : 47 s 715 ms
Overall bit rate : 27.3 Mb/s
Writing application : Lavf58.20.100
Writing library : Lavf58.20.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@Main
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 47 s 715 ms
Bit rate : 26.8 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.054
Stream size : 152 MiB (98%)
Writing library : x265 2.8:[Linux][GCC 9.1.0][64 bit] 10bit
Encoding settings : cpuid=1111039 / frame-threads=3 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=3840x2160 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=3 / no-allow-non-conformance / repeat-headers / annexb / no-aud / no-hrd / info / hash=0 / no-temporal-layers / open-gop / min-keyint=25 / keyint=250 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=20 / lookahead-slices=8 / scenecut=40 / radl=0 / no-intra-refresh / ctu=64 / min-cu-size=8 / no-rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=0 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=2 / limit-refs=3 / no-limit-modes / me=1 / subme=2 / merange=57 / temporal-mvp / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=3 / no-early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / no-b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=0.00 / no-rd-refine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=crf / crf=18.0 / qcomp=0.60 / qpstep=4 / stats-write=0 / stats-read=0 / ipratio=1.40 / pbratio=1.30 / aq-mode=1 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=1 / overscan=0 / videoformat=5 / range=0 / colorprim=9 / transfer=16 / colormatrix=9 / chromaloc=0 / display-window=0 / master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,50) / max-cll=0,0 / min-luma=0 / max-luma=1023 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / no-opt-cu-delta-qp / no-aq-motion / hdr / no-hdr-opt / no-dhdr10-opt / no-idr-recovery-sei / analysis-reuse-level=5 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-mv-type=0 / copy-pic=1 / max-ausize-factor=1.0 / no-dynamic-refine / no-single-sei
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0040 cd/m2, max: 1100 cd/m2



I suspect Color range, Color primaries and Transfer characteristics are necessary to make the file recognized as HDR by my TV. 
How can I add these properties to the VAAPI encoded file ?



Edit :
This patch fixes the problem :
Patch


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How to comvert MOV to MP4 with metadata [closed]
11 janvier 2020, par Nadav RosenbergI’m trying to convert mov videos from iphone to mp4 videos but I want to save the metadata.
I had tried some options but ffmpeg for android seems the best.Does any one have some kind of a template that I can just implement it ?
I don’t have a clue how to write in ffmpeg ..[screenshot from the app][1]
[another screenshot from the app][2]
log (the input is different then in the screenshot) :
ffmpeg -y -i "/storage/9C33-6BBD/DCIM/×¢×™× ×‘/IMG_5267.MOV" -c:v libx265 -q:v 5 -c:a aac -ab 128k -ar 44100 "/storage/emulated/0/FFMPEG/IMG_5267.mp4"
ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 4.9.x (GCC) 20150123 (prerelease)
configuration: --enable-version3 --enable-gpl --enable-nonfree --disable-indev=v4l2 --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libvpx --enable-libvorbis --enable-libtheora --enable-libopus --enable-libfdk-aac --enable-libfreetype --enable-libass --enable-libfribidi --enable-fontconfig --enable-pthreads --enable-libxvid --enable-filters --enable-openssl --enable-librtmp --disable-protocol='udp,udplite' --enable-libopencore-amrwb --enable-libopencore-amrnb --enable-libvo-amrwbenc --enable-libspeex --enable-libsoxr --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libopenh264 --enable-mediacodec --enable-jni --prefix=/home/silentlexx/AndroidstudioProjects/ffmpeg/ffmpeg/build/arm64-api21-r13b --sysroot=/home/silentlexx/Android/android-ndk-r13b/platforms/android-21/arch-arm64 --arch=arm64 --disable-shared --enable-static --enable-pic --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffnvcodec --disable-avdevice --disable-debug --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-symver --cross-prefix=/home/silentlexx/Android/android-ndk-r13b/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android- --target-os=android --enable-cross-compile --pkg-config-flags=--static --extra-libs='-lgnustl_static -lm -lpng -l:libz.so -lpthread' --enable-asm --enable-neon --enable-libxavs2 --disable-runtime-cpudetect --enable-small
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/9C33-6BBD/DCIM/×¢×™× ×‘/IMG_5267.MOV':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2020-01-04T10:43:12.000000Z
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 8 Plus
com.apple.quicktime.software: 12.4.1
com.apple.quicktime.creationdate: 2020-01-03T22:09:55+0200
com.apple.photos.originating.signature: AXIrrckzUSuTNLamJ909jOgUZ8Mr
Duration: 00:00:17.40, start: 0.000000, bitrate: 17343 kb/s
Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 16511 kb/s, 30.01 fps, 30 tbr, 600 tbn, 1200 tbc (default)
Metadata:
creation_time : 2020-01-04T10:43:12.000000Z
handler_name : Core Media Video
encoder : H.264
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 101 kb/s (default)
Metadata:
creation_time : 2020-01-04T10:43:12.000000Z
handler_name : Core Media Audio
Stream #0:2(und): Data: none (mebx / 0x7862656D), 33 kb/s (default)
Metadata:
creation_time : 2020-01-04T10:43:12.000000Z
handler_name : Core Media Metadata
Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
Metadata:
creation_time : 2020-01-04T10:43:12.000000Z
handler_name : Core Media Metadata
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 3.1×de920e0a3183
x265 [info]: build info [Linux][GCC 4.9.0][32 bit][noasm] 8bit
x265 [info]: using cpu capabilities: none!
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 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge : hex / 57 / 2 / 3
x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 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 lslices=6 deblock sao
Output #0, mp4, to '/storage/emulated/0/FFMPEG/IMG_5267.mp4':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
com.apple.photos.originating.signature: AXIrrckzUSuTNLamJ909jOgUZ8Mr
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 8 Plus
com.apple.quicktime.software: 12.4.1
com.apple.quicktime.creationdate: 2020-01-03T22:09:55+0200
encoder : Lavf58.29.100
Stream #0:0(und): Video: hevc (libx265) (hev1 / 0x31766568), yuv420p, 1920x1080, q=2-31, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
creation_time : 2020-01-04T10:43:12.000000Z
handler_name : Core Media Video
encoder : Lavc58.54.100 libx265
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s (default)
Metadata:
creation_time : 2020-01-04T10:43:12.000000Z
handler_name : Core Media Audio
encoder : Lavc58.54.100 aac
frame= 27 fps= 13 q=0.0 size= 0kB time=00:00:02.08 bitrate= 0.2kbits/s speed=1.02x
frame= 30 fps=9.1 q=-0.0 size= 0kB time=00:00:02.18 bitrate= 0.2kbits/s speed=0.665x
frame= 31 fps=8.1 q=-0.0 size= 0kB time=00:00:02.22 bitrate= 0.2kbits/s speed=0.581x
frame= 32 fps=7.3 q=-0.0 size= 0kB time=00:00:02.25 bitrate= 0.2kbits/s speed=0.511x
frame= 33 fps=5.9 q=-0.0 size= 0kB time=00:00:02.29 bitrate= 0.2kbits/s speed=0.409x
frame= 36 fps=5.4 q=-0.0 size= 0kB time=00:00:02.39 bitrate= 0.1kbits/s speed=0.359x
frame= 37 fps=5.0 q=-0.0 size= 0kB time=00:00:02.41 bitrate= 0.1kbits/s speed=0.324x
frame= 40 fps=4.5 q=-0.0 size= 0kB time=00:00:02.53 bitrate= 0.1kbits/s speed=0.287x
frame= 43 fps=4.3 q=-0.0 size= 0kB time=00:00:02.62 bitrate= 0.1kbits/s speed=0.265x
frame= 44 fps=4.1 q=-0.0 size= 0kB time=00:00:02.64 bitrate= 0.1kbits/s speed=0.248x
frame= 45 fps=3.9 q=-0.0 size= 0kB time=00:00:02.69 bitrate= 0.1kbits/s speed=0.231x
frame= 48 fps=3.7 q=-0.0 size= 0kB time=00:00:02.78 bitrate= 0.1kbits/s speed=0.217x
frame= 50 fps=3.7 q=-0.0 size= 0kB time=00:00:02.85 bitrate= 0.1kbits/s speed=0.214x
frame= 51 fps=3.4 q=-0.0 size= 0kB time=00:00:02.87 bitrate= 0.1kbits/s speed=0.195x
frame= 54 fps=3.2 q=-0.0 size= 256kB time=00:00:02.99 bitrate= 700.2kbits/s speed=0.18x
frame= 57 fps=3.2 q=-0.0 size= 256kB time=00:00:03.08 bitrate= 679.2kbits/s speed=0.174x
frame= 58 fps=3.1 q=-0.0 size= 256kB time=00:00:03.11 bitrate= 674.1kbits/s speed=0.169x
frame= 59 fps=3.1 q=-0.0 size= 256kB time=00:00:03.15 bitrate= 664.2kbits/s speed=0.165x
frame= 61 fps=3.0 q=-0.0 size= 256kB time=00:00:03.22 bitrate= 649.9kbits/s speed=0.161x
frame= 62 fps=3.0 q=-0.0 size= 256kB time=00:00:03.25 bitrate= 645.2kbits/s speed=0.157x
frame= 63 fps=2.9 q=-0.0 size= 256kB time=00:00:03.29 bitrate= 636.1kbits/s speed=0.152x
frame= 65 fps=2.9 q=-0.0 size= 256kB time=00:00:03.34 bitrate= 627.3kbits/s speed=0.149x
frame= 66 fps=2.9 q=-0.0 size= 256kB time=00:00:03.39 bitrate= 618.7kbits/s speed=0.147x
frame= 68 fps=2.9 q=-0.0 size= 256kB time=00:00:03.45 bitrate= 606.3kbits/s speed=0.146x
frame= 69 fps=2.8 q=-0.0 size= 256kB time=00:00:03.48 bitrate= 602.2kbits/s speed=0.142x
frame= 70 fps=2.8 q=-0.0 size= 256kB time=00:00:03.52 bitrate= 594.3kbits/s speed=0.14x
frame= 72 fps=2.8 q=-0.0 size= 256kB time=00:00:03.59 bitrate= 582.8kbits/s speed=0.14x
frame= 73 fps=2.8 q=-0.0 size= 256kB time=00:00:03.62 bitrate= 579.1kbits/s speed=0.136x
frame= 74 fps=2.7 q=-0.0 size= 256kB time=00:00:03.64 bitrate= 575.4kbits/s speed=0.134x
frame= 76 fps=2.7 q=-0.0 size= 256kB time=00:00:03.71 bitrate= 564.6kbits/s speed=0.132x
frame= 77 fps=2.7 q=-0.0 size= 256kB time=00:00:03.76 bitrate= 557.6kbits/s speed=0.13x
frame= 79 fps=2.7 q=-0.0 size= 256kB time=00:00:03.83 bitrate= 547.5kbits/s speed=0.131x
frame= 80 fps=2.7 q=-0.0 size= 512kB time=00:00:03.85 bitrate=1088.2kbits/s speed=0.129x
frame= 82 fps=2.6 q=-0.0 size= 512kB time=00:00:03.92 bitrate=1068.9kbits/s speed=0.127x
frame= 83 fps=2.6 q=-0.0 size= 512kB time=00:00:03.94 bitrate=1062.6kbits/s speed=0.125x
frame= 84 fps=2.6 q=-0.0 size= 512kB time=00:00:03.99 bitrate=1050.3kbits/s speed=0.124x
frame= 87 fps=2.6 q=-0.0 size= 512kB time=00:00:04.08 bitrate=1026.4kbits/s speed=0.122x
frame= 89 fps=2.6 q=-0.0 size= 512kB time=00:00:04.15 bitrate=1009.2kbits/s speed=0.12x
frame= 90 fps=2.6 q=-0.0 size= 512kB time=00:00:04.17 bitrate=1003.6kbits/s speed=0.119x
frame= 92 fps=2.6 q=-0.0 size= 512kB time=00:00:04.24 bitrate= 987.2kbits/s speed=0.119x
frame= 93 fps=2.5 q=-0.0 size= 512kB time=00:00:04.29 bitrate= 976.5kbits/s speed=0.118x
frame= 94 fps=2.5 q=-0.0 size= 512kB time=00:00:04.31 bitrate= 971.2kbits/s speed=0.116x
frame= 96 fps=2.5 q=-0.0 size= 512kB time=00:00:04.38 bitrate= 955.8kbits/s speed=0.116x
frame= 97 fps=2.5 q=-0.0 size= 512kB time=00:00:04.41 bitrate= 950.8kbits/s speed=0.115x
frame= 100 fps=2.5 q=-0.0 size= 512kB time=00:00:04.52 bitrate= 926.4kbits/s speed=0.113x
frame= 101 fps=2.5 q=-0.0 size= 512kB time=00:00:04.55 bitrate= 921.7kbits/s speed=0.111x
frame= 103 fps=2.5 q=-0.0 size= 512kB time=00:00:04.62 bitrate= 907.8kbits/s speed=0.112x
frame= 104 fps=2.5 q=-0.0 size= 512kB time=00:00:04.64 bitrate= 903.2kbits/s speed=0.11x
frame= 105 fps=2.5 q=-0.0 size= 512kB time=00:00:04.69 bitrate= 894.3kbits/s speed=0.11x
frame= 106 fps=2.4 q=-0.0 size= 512kB time=00:00:04.71 bitrate= 889.9kbits/s speed=0.109x
frame= 107 fps=2.4 q=-0.0 size= 512kB time=00:00:04.76 bitrate= 881.2kbits/s speed=0.108x
frame= 108 fps=2.4 q=-0.0 size= 512kB time=00:00:04.78 bitrate= 876.9kbits/s speed=0.105x
frame= 111 fps=2.4 q=-0.0 size= 768kB time=00:00:04.89 bitrate=1284.2kbits/s speed=0.105x
frame= 112 fps=2.4 q=-0.0 size= 768kB time=00:00:04.92 bitrate=1278.1kbits/s speed=0.104x
frame= 115 fps=2.4 q=-0.0 size= 768kB time=00:00:05.01 bitrate=1254.5kbits/s speed=0.103x
frame= 116 fps=2.4 q=-0.0 size= 768kB time=00:00:05.06 bitrate=1243.0kbits/s speed=0.103x
frame= 119 fps=2.4 q=-0.0 size= 768kB time=00:00:05.15 bitrate=1220.6kbits/s speed=0.102x
frame= 120 fps=2.3 q=-0.0 size= 768kB time=00:00:05.17 bitrate=1215.1kbits/s speed=0.101x
frame= 121 fps=2.3 q=-0.0 size= 768kB time=00:00:05.22 bitrate=1204.3kbits/s speed=0.0998x
frame= 124 fps=2.3 q=-0.0 size= 768kB time=00:00:05.31 bitrate=1183.3kbits/s speed= 0.1x
frame= 126 fps=2.3 q=-0.0 size= 768kB time=00:00:05.38 bitrate=1168.0kbits/s speed=0.0983x
frame= 129 fps=2.3 q=-0.0 size= 768kB time=00:00:05.47 bitrate=1148.2kbits/s speed=0.0985x
frame= 130 fps=2.3 q=-0.0 size= 768kB time=00:00:05.52 bitrate=1138.5kbits/s speed=0.0984x
frame= 131 fps=2.3 q=-0.0 size= 768kB time=00:00:05.54 bitrate=1133.7kbits/s speed=0.0975x
frame= 134 fps=2.3 q=-0.0 size= 768kB time=00:00:05.64 bitrate=1115.1kbits/s speed=0.0976x
frame= 136 fps=2.3 q=-0.0 size= 768kB time=00:00:05.71 bitrate=1101.5kbits/s speed=0.0976x
frame= 138 fps=2.3 q=-0.0 size= 768kB time=00:00:05.78 bitrate=1088.2kbits/s speed=0.0977x
frame= 139 fps=2.3 q=-0.0 size= 768kB time=00:00:05.82 bitrate=1079.5kbits/s speed=0.0974x
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frame= 266 fps=2.2 q=-0.0 size= 1792kB time=00:00:1 -
What ffmpeg command line will list the key frames ?
21 décembre 2019, par ChrisJJWhat ffmpeg command line will list the index numbers of the key frames in an existing .MP4 to stdout ?
I’ve tried the only applicable answer at https://superuser.com/questions/885452/extracting-the-index-of-key-frames-from-a-video-using-ffmpeg to no avail.
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