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Médias (1)
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1 000 000 (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
Autres articles (79)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...) -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Sur d’autres sites (11626)
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Convert a native Insta360 video to another format
5 mai 2021, par ChelouteI'd like to figure out how to convert a Insta360 native video (360º) to a specific one (360º).


mediainfo gives these metadata for the original file :




General
Complete name : VID_20210503_142435_00_003(2).insv
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 329 MiB
Duration : 52 s 319 ms
Overall bit rate mode : Variable
Overall bit rate : 52.7 Mb/s
Writing application : Lavf58.13.101
IsTruncated : Yes
FileExtension_Invalid : braw mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L5.1
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=32
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 52 s 319 ms
Bit rate mode : Variable
Bit rate : 50.0 Mb/s
Width : 3 840 pixels
Height : 1 920 pixels
Display aspect ratio : 2.000
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.226
Stream size : 312 MiB (95%)
Color range : Full
Color primaries : BT.601 NTSC
Transfer characteristics : BT.601
Matrix coefficients : BT.601
Codec configuration box : avcC





My goal is to convert this video to that specifications :




General
Complete name : VID_20210503_142435_00_003(2).mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 83.5 MiB
Duration : 52 s 429 ms
Overall bit rate : 13.4 Mb/s
Writing application : Lavf58.13.101
Comment : 2021-05-03 12:24:35 +0000
Make : Insta360
Model : ONEX.Panorama


Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=4
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 52 s 429 ms
Source duration : 52 s 429 ms
Bit rate : 13.2 Mb/s
Width : 3 840 pixels
Height : 1 920 pixels
Display aspect ratio : 2.000
Frame rate mode : Constant
Frame rate : 7.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.256
Stream size : 82.7 MiB (99%)
Source stream size : 82.7 MiB (99%)
Codec configuration box : avcC





Would it be possible to do this with FFMPEG ? How ?


Thanks


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Ideal bitrates for different video resolutions
15 octobre 2018, par Ramesh NaviI am building a Video-on-demand service for a closed community. I using FFMPEG for video processing and dash.js for adaptive bitrate player with custom resolution selector. Can somebody please suggest what ideal bitrates should I use while video/audio transcoding ?
I am talking about
-b:v
and-ab
optionffmpeg -i vid.mp4 -c:v libvpx-vp9 -keyint_min 150 \
-g 150 -tile-columns 4 -frame-parallel 1 -f webm -dash 1 \
-an -vf scale=144:-1 -b:v 120k -dash 1 video_1.webm \
-an -vf scale=240:-1 -b:v 250k -dash 1 video_2.webm \
-an -vf scale=360:-1 -b:v 500k -dash 1 video_3.webm \
-an -vf scale=480:-1 -b:v 750k -dash 1 video_4.webm \
-an -vf scale=720:-1 -b:v 1500k -dash 1 video_5.webmAnd
ffmpeg -i vid.mp4 -vn -acodec libvorbis -ab 96k -dash 1 audio_96k.webm
Any suggestions/hacks or examples to tackle real-world network situations are appreciated.
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swscale/aarch64 : use multiply accumulate and shift-right narrow
9 décembre 2019, par Sebastian Popswscale/aarch64 : use multiply accumulate and shift-right narrow
This patch rewrites the innermost loop of ff_yuv2planeX_8_neon to avoid zips and
horizontal adds by using fused multiply adds. The patch also uses ld1r to load
one element and replicate it across all lanes of the vector. The patch also
improves the clipping code by removing the shift right instructions and
performing the shift with the shift-right narrow instructions.I see 8% difference on an m6g instance with neoverse-n1 CPUs :
$ ffmpeg -nostats -f lavfi -i testsrc2=4k:d=2 -vf bench=start,scale=1024x1024,bench=stop -f null -
before : t:0.014015 avg:0.014096 max:0.015018 min:0.013971
after : t:0.012985 avg:0.013013 max:0.013996 min:0.012818Tested with `make check` on aarch64-linux.
Signed-off-by : Sebastian Pop <spop@amazon.com>
Reviewed-by : Clément Bœsch <u@pkh.me>
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>