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Autres articles (60)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • Participer à sa documentation

    10 avril 2011

    La documentation est un des travaux les plus importants et les plus contraignants lors de la réalisation d’un outil technique.
    Tout apport extérieur à ce sujet est primordial : la critique de l’existant ; la participation à la rédaction d’articles orientés : utilisateur (administrateur de MediaSPIP ou simplement producteur de contenu) ; développeur ; la création de screencasts d’explication ; la traduction de la documentation dans une nouvelle langue ;
    Pour ce faire, vous pouvez vous inscrire sur (...)

Sur d’autres sites (9121)

  • ffmpeg output video is not up to the par

    4 juin 2015, par user3668629

    I am trying to overlay text on video with ffmpeg. The following command is working fine. My concern is the resultant video quality. There is a difference in quality between the original and output video. With the following command, the output video size is almost half of the original one. How can I maintain the size in the output vid ? Any suggestions. I have tried to increase the framerate as well as bitrate, but the quality does not improve. Can you please give me suggestions of how can I retain the same video quality and size in my output video. Your help will be much appreciated. Thank you.

    $ffmpeg -i input_video.mp4 -filter:v drawtext="fontfile=/path/to/font.ttf: text='Demo Text': fontcolor=white: fontsize=24" -video_size hd720 -codec:v mpeg4 output_video.mp4  

  • Xuggler encoding and muxing

    18 décembre 2012, par HeineyBehinds

    I'm trying to use Xuggler (which I believe uses ffmpeg under the hood) to do the following :

    • Accept a raw MPJPEG video bitstream (from a small TTL serial camera) and encode/transcode it to h.264 ; and
    • Accept a raw audio bitsream (from a microphone) and encode it to AAC ; then
    • Mux the two (audio and video) bitsreams together into a MPEG-TS container

    I've watched/read some of their excellent tutorials, and so far here's what I've got :

    // I'll worry about implementing this functionality later, but
    
// involves querying native device drivers.
    
byte[] nextMjpeg = getNextMjpegFromSerialPort();
    

    
// I'll also worry about implementing this functionality as well;
    
// I'm simply providing these for thoroughness.
    
BufferedImage mjpeg = MjpegFactory.newMjpeg(nextMjpeg);
    

    
// Specify a h.264 video stream (how?)
    
String h264Stream = "???";
    

    
IMediaWriter writer = ToolFactory.makeWriter(h264Stream);
    
writer.addVideoStream(0, 0, ICodec.ID.CODEC_ID_H264);
    
writer.encodeVideo(0, mjpeg);

    For one, I think I'm close here, but it's still not correct ; and I've only gotten this far by reading the video code examples (not the audio - I can't find any good audio examples).

    Literally, I'll be getting byte-level access to the raw video and audio feeds coming into my Xuggler implementation. But for the life of me I can't figure out how to get them into an h.264/AAC/MPEG-TS format. Thanks in advance for any help here.

  • aarch64 : Fix ff_hevc_put_hevc_epel_h48_8_neon_i8mm

    12 mars 2024, par Martin Storsjö
    aarch64 : Fix ff_hevc_put_hevc_epel_h48_8_neon_i8mm

    The first 32 elements of each row were correct, while the
    
last 16 were scrambled.
    

    This hasn't been noticed, because the checkasm test erroneously
    
only checked half of the output (for 8 bit functions), and
    
apparently none of the samples as part of "fate-hevc" seem to
    
trigger this specific function.
    

    Signed-off-by : J. Dekker <jdek@itanimul.li>
    • [DH] libavcodec/aarch64/hevcdsp_epel_neon.S

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