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Autres articles (104)

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    25 avril 2011, par

    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
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    If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)

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    5 septembre 2013, par

    Certains 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 ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
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Sur d’autres sites (12064)

  • Setting very fast movie speed

    24 avril 2018, par JoeSkurczysyn

    He tries to set the movie’s acceleration to 70 minutes so that a movie with a maximum length of 2 minutes will come out. However, FFMPEG fails. Films with a length of over 20 minutes come out, which is not what they expect.

    I write this :

    ffmpeg -i output.mp4 -filter:v "setpts=0.90*PTS" -an output2.mp4

    What am I doing wrong ?

  • swscale : add full bgra64 support

    2 avril 2014, par Michael Niedermayer
    swscale : add full bgra64 support

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libswscale/input.c
    • [DH] libswscale/output.c
    • [DH] libswscale/utils.c
    • [DH] libswscale/version.h
    • [DH] tests/ref/fate/filter-pixdesc
    • [DH] tests/ref/fate/filter-pixfmts-copy
    • [DH] tests/ref/fate/filter-pixfmts-crop
    • [DH] tests/ref/fate/filter-pixfmts-field
    • [DH] tests/ref/fate/filter-pixfmts-fieldorder
    • [DH] tests/ref/fate/filter-pixfmts-hflip
    • [DH] tests/ref/fate/filter-pixfmts-il
    • [DH] tests/ref/fate/filter-pixfmts-null
    • [DH] tests/ref/fate/filter-pixfmts-scale
    • [DH] tests/ref/fate/filter-pixfmts-vflip

  • FFMPEG - Adding a full-frame image to the beginning of a video

    28 mars 2014, par user3470655

    I have tried many different ways to try to create a 10 second video file out of an image file and have used all the same switches and codecs as I used to encode my video file. However, when I concat the two using anything but complex_filter (which forces the video through another round of transcoding), the resulting video file is corrupt. I believe this is due to the inherent differences of the 10 second clip that ffmpeg created from the image, but there must be some way to get it to encode the exact same way as my video file.

    Here is the command I am using to turn the image into a 10s video clip (I added a silent mp3 because I thought that an audio stream starting partway through the video was messing things up) :

    ffmpeg -loop 1 -i splash.jpg -i silence.mp3 -c:v libx264 -preset slow -g 60 -r 29.97 -crf 16 -c:a libfdk_aac -b:a 256k -cutoff 18000 -t 5 tmpoutput1.mp4

    Here is the command I am using to encode my video :

    ffmpeg -i input.f4v -c:v libx264 -preset slow -g 60 -r 29.97 -crf 16 -c:a libfdk_aac -b:a 256k -cutoff 18000 tmpoutput2.mp4

    Here is the command I use to convert both of them to .ts to get ready for concat :

    ffmpeg -i tmpoutput1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts tmpoutput1.ts

    And finally the concat (which is where I get crazy video corruption, everything along the way looks fine) :

    ffmpeg -i "concat:tmpoutput1.ts|tmpoutput2.ts" -c copy output.mp4

    Again, the issue is that I'm already transcoding everything once and I should be able to get it to transcode in a similar enough structure so that it can be concatenated without another transcode tacked onto the end.

    Has anyone successfully added a full-frame splash graphic to the front of a video with ffmpeg before ? I am using a brand new cross-compile of ffmpeg as I thought that might be the issue, but alas, the issue persists after the update.

    Thanks !

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