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Autres articles (63)
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Encodage et transformation en formats lisibles sur Internet
10 avril 2011MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...) -
Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
You may also (...) -
Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs
Sur d’autres sites (9243)
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FFMpeg : reencode audio file to have the same codec params as another file [closed]
11 mars 2023, par EvilOrangeI need to merge three audio files :


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- big1
- small1
- big2








Codecs in these files may differ (but big1 and big2 which always have the same codec)


small1 is about 20-30 seconds


Now I'm using the following command for that :


ffmpeg -i big1 -i small1 -i big1 -filter_complex concat=n=3:v=0:a=1 -c:a {big1.extension} -vn out.{big1.extension


it's working, but this will require reencoding and it's slow.


I think, that it can be optimized by using concatenation without reencoding : https://trac.ffmpeg.org/wiki/Concatenate


But I need the same codec for all files.


So, now I need the following :


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- Get codec information from big1
- Reencode small1 to the same parameters
- merge files using concat demuxer without reencoding








So, I need a way to get codec information and pass these params to ffmpeg to convert small1.


I'm not tied to ffmpeg, if another linux cmd tool can do the same ( fastly merge three audio files) - it's also acceptable.


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HW Accel Transcode Intel Quick Sync Video QSV h264_qsv and CRF Quality
26 août 2020, par Matt McManisI'm having a problem with HW Accel Intel Quick Sync Video and CRF.



It looks like CRF
-crf
is not compatible with-c:v h264_qsv
.


Only Bit Rate
-b:v
works with-c:v h264_qsv
.


ffmpeg -i input.mp4 -c:v h264_qsv -crf 25 -pix_fmt nv12 output.mkv






https://trac.ffmpeg.org/wiki/Hardware/QuickSync



The guide says "ICQ mode (which is similar to crf mode of x264)"
-global_quality 25



ffmpeg -i input.mp4 -c:v h264_qsv -global_quality 25 -pix_fmt nv12 output.mkv




But I cannot get it to work. I get the error
Selected ratecontrol mode is unsupported
.




How do I get either CRF or ICQ to work ?


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ffmpeg and gnu parallel
16 août 2013, par souvikMy work would require me to encode a few thousand movies in a few days. Each movie needs to be encoded in 3 different formats. I use ffmpeg to output these formats in parallel with a single read of the input source as detailed here : http://ffmpeg.org/trac/ffmpeg/wiki/Creating%20multiple%20outputs
In addition, I am using GNU Parallel to encode from multiple video files in parallel. We have four blade servers of different configurations (48, 32, 16 and 16 cores) encoding videos in parallel. Ideally, we should be able to encode 112 videos in parallel.
However, it seems that encoding completes faster on machines with lesser cores. I have 16 completed encodes on the 16 core servers in around 4 hours, while it takes close to 10 hours for 48 encodes to complete on the 48 core system. What could be the bottleneck ? A typical encode command is as follows :
ffmpeg -i sample.mpg -y -vcodec libx264 -vprofile baseline -level 30 -acodec libfdk_aac -ab 128k -ac 2 -b:v 500K -threads 1 encoded/sample_enc.mp4
Any pointers highly appreciated. Thanks !