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Médias (1)
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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
Autres articles (92)
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Other interesting software
13 avril 2011, parWe don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
We don’t know them, we didn’t try them, but you can take a peek.
Videopress
Website : http://videopress.com/
License : GNU/GPL v2
Source code : (...) -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (7518)
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huffyuvdec : implement trick
3 juin 2014, par Christophe Gisquethuffyuvdec : implement trick
When the joint table does not contain a valid entry, the decoding restarts
from scratch. By implementing the trick of jumping to the 2nd level of the
individual table (and inlining the whole), a speed improvement of 5-10%
is possible.On a 1000-frames YUV4:2:0 video, before :
362851 decicycles in 422, 262094 runs, 50 skips
182488 decicycles in gray, 262087 runs, 57 skips
Object size : 23584
Overall time : 8.377After :
346800 decicycles in 422, 262079 runs, 65 skips
168197 decicycles in gray, 262077 runs, 67 skips
Object size : 23188
Overall time : 7.878Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
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fftools/ffmpeg_enc : avoid breaking exactly integer timestamps in vsync code
28 mai 2023, par Anton Khirnovfftools/ffmpeg_enc : avoid breaking exactly integer timestamps in vsync code
The code will currently add a small offset to avoid exact midpoints, but
this can cause inexact results when a float timestamp is exactly
representable as an integer.Fixes off-by-one in the first frame duration in multiple FATE tests.
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ffmpeg monochrome rawvideo
5 juin 2020, par user3482407I am trying to generate a raw video stream with luma only (monochrome, YUV400) 8bit pixel data using the following command :



ffmpeg -i input.mp4 -vcodec rawvideo -pix_fmt raw.yuv



After that I want to h.264 encode the raw stream with the profiles that support monochrome pixel data (eg : high)



ffmpeg -f rawvideo -vcodec rawvideo -pix_fmt gray -s 640x512 -r 60 -i raw.yuv -codec:v libx264 -profile:v high -c:a copy out.mp4



However, i always get the following error, which indicates that the raw stream is not in the monochrome format that I expected :



x264 [error]: high profile doesn't support 4:4:4



I am new to ffmpeg and video formats in general. Can somebody please point out what I am missing ?



Thank you !



Edit :
I also tried to use the following filter to extract only the luma channel. Unfortunately, the end result was the same.



ffmpeg -i input.mp4 -vcodec rawvideo -pix_fmt gray -filter_complex 'extractplanes=y[y]' -map '[y]' raw.yuv


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