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    21 juin 2013, par

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    Dans la rubrique "Champs à ajouter, cocher "Date de publication "
    Cliquer en bas de la page sur Enregistrer

  • Les statuts des instances de mutualisation

    13 mars 2010, par

    Pour des raisons de compatibilité générale du plugin de gestion de mutualisations avec les fonctions originales de SPIP, les statuts des instances sont les mêmes que pour tout autre objets (articles...), seuls leurs noms dans l’interface change quelque peu.
    Les différents statuts possibles sont : prepa (demandé) qui correspond à une instance demandée par un utilisateur. Si le site a déjà été créé par le passé, il est passé en mode désactivé. publie (validé) qui correspond à une instance validée par un (...)

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Sur d’autres sites (7494)

  • Android Exoplayer garbled mp4 video output on imagereader surface while playing fine on SurfaceView (Samsung galaxy tab s7)

    29 mars 2023, par Orcun

    Problem :

    


    I am trying to play an mp4 video file on Samsung Galaxy Tab S7 for video processing purposes. For the purpose, I use Exoplayer(v2.18.4) library to be able to play the video onto an ImageReader surface so that I can grab the frames in ImageReader.OnImageAvailableListener.

    


    I do not have any problems in getting the frames. However, the frames I acquire are garbled/corrupted like :

    


    garbled frame

    


    When I saw this frame, it made me think that it is some sort of color format or codec issue for the mp4 file or device I use. In logcat, there are no errors reported.
Device uses [OMX.qcom.video.decoder.avc] decoder. Also, same video plays nicely on some other devices that use exactly the same decoder.

    


    What I tried so far :

    


    I tried a lot of things to understand the root cause and also find a solution, so my brain currently is free flowing stream. I will try to summarise, please bear with me.

    


    I use a CustomMediaCodecVideoRenderer in my app which overrides MediaCodecVideoRenderer.getMediaFormat of Exoplayer to set color format like :

    


    setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Flexible)


    


    This step proved itself necessary. Without it I get a crash simply because I cannot access the image planes of an image frame in expected YUV image format.
This unfortunately was not enough for the Samsung Galaxy Tab 7 although it was already enough for another device like Xiaomi to render the image correctly.

    


    Then I decided to use a library like ffmpeg to modify the mp4 file itself to maybe use a different profile, color format, resolution that is widely compatible in android devices. No luck so far.
a quick ffprobe on my mp4 file shows :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outputyuv169.mp4':
Metadata:
  major_brand     : isom
  minor_version   : 512
  compatible_brands: isomiso2avc1mp41
  encoder         : Lavf59.16.100
Duration: 00:03:00.02, start: 0.000000, bitrate: 4823 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 
1280x720 [SAR 1:1 DAR 16:9], 4820 kb/s, 30 fps, 30 tbr, 360k tbn (default)


    


    I tried even recording a simple video on the tablet itself and using that as my input file. Nevertheless, still getting similarly garbled frames.

    


    One thing I keep noticing in logcat is this line :

    


    [OMX.qcom.video.decoder.avc] using color format 0x7fa30c04 in place of 0x7f420888

    


    and

    


    [OMX.qcom.video.decoder.avc] Requested output format 0x7f420888 and got 0x7fa30c04

    


    where 0x7fa30c04 refers to YCbCr_420_SP_VENUS_UBWC. Not really sure If this has anything to do with it. I did not dive too deep into that because same log is present also on other device that renders the mp4 correctly.

    


    I would be grateful for any clue.

    


  • configure : Group system feature variables and system libraries together

    26 septembre 2017, par Diego Biurrun
    configure : Group system feature variables and system libraries together
    • [DBH] configure

  • How does sunshine capture and stream the desktop

    24 juin 2024, par user16235056

    I am looking to understand the Sunshine project by Loki which works with moonlight to stream a desktop with very low latency based on Nvidia's GameStream.

    


    I looked at the source code on GitHub, but couldn't figure out how the screen is captured and the stream is converted to an RTSP packet.
I think they use ffmpeg to capture the screen.

    


    I did find the RTSP packet definition here

    


    Could someone explain how this works ?
I am trying to understand this on a low level, since I want to implement a similar program as part of a project later(probably in C++ itself).

    


    I don't have much experience here, but am looking to get my hands dirty ! :)

    


    Hope my question is clear and any help to understand this or other resources I could take a look at would be greatly appreciated.

    


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