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    Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
    Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • Des sites réalisés avec MediaSPIP

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    Mediaspip core
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Sur d’autres sites (7487)

  • Unknown V4L2 pixel format equivalent for yuvj420p

    23 mars 2020, par c10ud

    I am trying to pipe a mp4 video located in Videos/video.mp4 to a virtual webcam device located at /dev/video0.

    I tried running :
    ffmpeg -re -i Videos/video.mp4 -map 0:v -f v4l2 /dev/video0
    and I keep getting the following error :

    [video4linux2,v4l2 @ 0x5580cf270100] Unknown V4L2 pixel format equivalent for yuvj420p
    Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
    Error initializing output stream 0:0 --
    Conversion failed!

    Full log :

    ffmpeg version 4.2.2-1+b1 Copyright (c) 2000-2019 the FFmpeg developers
     built with gcc 9 (Debian 9.2.1-28)
     configuration: --prefix=/usr --extra-version=1+b1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
     libavutil      56. 31.100 / 56. 31.100
     libavcodec     58. 54.100 / 58. 54.100
     libavformat    58. 29.100 / 58. 29.100
     libavdevice    58.  8.100 / 58.  8.100
     libavfilter     7. 57.100 /  7. 57.100
     libavresample   4.  0.  0 /  4.  0.  0
     libswscale      5.  5.100 /  5.  5.100
     libswresample   3.  5.100 /  3.  5.100
     libpostproc    55.  5.100 / 55.  5.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Videos/video.mp4':
     Metadata:
       major_brand     : mp42
       minor_version   : 0
       compatible_brands: isommp42
       creation_time   : 2020-03-23T04:24:01.000000Z
       com.android.version: 8.1.0
     Duration: 00:01:00.14, start: 0.000000, bitrate: 20048 kb/s
       Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, smpte170m), 1920x1080, 19898 kb/s, SAR 1:1 DAR 16:9, 29.43 fps, 29.58 tbr, 90k tbn, 180k tbc (default)
       Metadata:
         rotate          : 270
         creation_time   : 2020-03-23T04:24:01.000000Z
         handler_name    : VideoHandle
       Side data:
         displaymatrix: rotation of 90.00 degrees
       Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
       Metadata:
         creation_time   : 2020-03-23T04:24:01.000000Z
         handler_name    : SoundHandle
    Stream mapping:
     Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
    Press [q] to stop, [?] for help
    [video4linux2,v4l2 @ 0x5580cf270100] Unknown V4L2 pixel format equivalent for yuvj420p
    Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
    Error initializing output stream 0:0 --
    Conversion failed!

    The desired result is that the mp4 video is seen by apps that try to view the webcam. I am running this on a desktop without a webcam or video interface, which is why I am using /dev/video0

  • Python librosa NoBackendError even though ffmpeg is installed

    11 avril 2020, par Slavko Kovačević

    I recently installed librosa (package I've been using for a while on different PC) on my new PC with Windows 10 running. After that I've downloaded latest static version of ffmpeg and copied it to C: and added it to the Path. Tested ffmpeg and it works like a charm ! For python I am using Anaconda environment and after starting Jupyter Notebook and running librosa.load(path, sr = None) I've got

    



     in <module>&#xA;----> 1 audio = librosa.load(pathToJson)&#xA;&#xA;~\anaconda3\envs\tf_gpu\lib\site-packages\librosa\core\audio.py in load(path, sr, mono, offset, duration, dtype, res_type)&#xA;    117 &#xA;    118     y = []&#xA;--> 119     with audioread.audio_open(os.path.realpath(path)) as input_file:&#xA;    120         sr_native = input_file.samplerate&#xA;    121         n_channels = input_file.channels&#xA;&#xA;~\anaconda3\envs\tf_gpu\lib\site-packages\audioread\__init__.py in audio_open(path, backends)&#xA;    114 &#xA;    115     # All backends failed!&#xA;--> 116     raise NoBackendError()&#xA;&#xA;NoBackendError:&#xA;</module>

    &#xA;&#xA;

    strange isn't it ? Then I went all over the internet, doing whatnot trying to fix it and then I've got an idea to run my line of code inside anaconda command interface and it WORKS ?? How is this possible ? It is the same environment.

    &#xA;&#xA;

    python&#xA;Python 3.7.7 (default, Mar 23 2020, 23:19:08) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32&#xA;Type "help", "copyright", "credits" or "license" for more information.&#xA;>>> import librosa&#xA;>>> librosa.load(&#x27;test.wav&#x27;)&#xA;(array([-0.00027   , -0.00039953, -0.0003659 , ..., -0.16393574,&#xA;       -0.17814247,  0.        ], dtype=float32), 22050)&#xA;

    &#xA;&#xA;

    I did a lot of testing and I really prefer my Jupyter so any help would be appreciated. I tried the following : I've added C:\ffmpeg\bin and C:\ffmpeg to my Path for both User and System Variables. After that I've made specific variables for ffmpeg and ffmpeg_bin for both User and System Variables. No luck. After that I've tried installing ffmpeg using conda, without success. The last thing I've tested is this :

    &#xA;&#xA;

    import audioread&#xA;audioread.ffdec.FFmpegAudioFile(&#x27;test.wav&#x27;)&#xA;

    &#xA;&#xA;

    and that works. Thanks

    &#xA;

  • Why won't this encrypted HLS video play on iOS (but works on Windows Chrome via hls.js library) ?

    8 mai 2023, par Ryan

    I am trying to play an MP4 test video.

    &#xA;

    My /home/vagrant/Code/example/public/hls_hls.keyInfo is :

    &#xA;

    https://example.com/hls.key&#xA;/home/vagrant/Code/example/public/hls_hls.key&#xA;467216aae8a26fb699080812628031955e304a66e9e4480f9b70d31d8fe94e9a&#xA;

    &#xA;

    My /home/vagrant/Code/example/public/hls_hls.key was generated using PHP : hex2bin(&#x27;467216aae8a26fb699080812628031955e304a66e9e4480f9b70d31d8fe94e9a&#x27;)

    &#xA;

    The ffmpeg command for encrypting the video as HLS playlist with "ts" files :

    &#xA;

    &#x27;/usr/bin/ffmpeg&#x27; &#x27;-y&#x27; &#x27;-i&#x27; &#x27;storage/app/sample_media2/2020-02-27/Sample_Videos_5.mp4&#x27; &#xA;&#x27;-c:v&#x27; &#x27;libx264&#x27; &#x27;-s:v&#x27; &#x27;1920x1080&#x27; &#x27;-crf&#x27; &#x27;20&#x27; &#x27;-sc_threshold&#x27; &#x27;0&#x27; &#x27;-g&#x27; &#x27;48&#x27; &#xA;&#x27;-keyint_min&#x27; &#x27;48&#x27; &#x27;-hls_list_size&#x27; &#x27;0&#x27; &#xA;&#x27;-hls_time&#x27; &#x27;10&#x27; &#x27;-hls_allow_cache&#x27; &#x27;0&#x27; &#x27;-b:v&#x27; &#x27;4889k&#x27; &#x27;-maxrate&#x27; &#x27;5866k&#x27; &#xA;&#x27;-hls_segment_type&#x27; &#x27;mpegts&#x27; &#x27;-hls_fmp4_init_filename&#x27; &#x27;output_init.mp4&#x27; &#xA;&#x27;-hls_segment_filename&#x27; &#x27;storage/app/public/test/output_1080p_%04d.ts&#x27; &#xA;&#x27;-hls_key_info_file&#x27; &#x27;/home/vagrant/Code/example/public/hls_hls.keyInfo&#x27; &#xA;&#x27;-strict&#x27; &#x27;-2&#x27; &#x27;-threads&#x27; &#x27;12&#x27; &#x27;storage/app/public/test/output_1080p.m3u8&#x27;&#xA;

    &#xA;

    Then, I know from https://caniuse.com/#search=hls that Windows Chrome won't be able to play the HLS video without a library, so I use https://github.com/video-dev/hls.js/, and Windows Chrome successfully plays the encrypted video !

    &#xA;

    However, iOS Safari is unable to play it (with or without the hls.js library).

    &#xA;

    On iOS Safari, when I try to play the video, I see just a quick glimpse (less than a second) where the screen shows 0:15, so it must be reading and decrypting enough to know the correct duration of the video.

    &#xA;

    So, to debug, I log events :

    &#xA;

    const nativeHlsEvents = [&#x27;play&#x27;, &#x27;playing&#x27;, &#x27;abort&#x27;, &#x27;error&#x27;, &#x27;canplaythrough&#x27;, &#x27;waiting&#x27;, &#x27;loadeddata&#x27;, &#x27;loadstart&#x27;, &#x27;progress&#x27;, &#x27;timeupdate&#x27;, &#x27;volumechange&#x27;];&#xA;$.each(nativeHlsEvents, function (i, eventType) {&#xA;    video.addEventListener(eventType, (event) => {//https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement&#xA;        console.log(eventType, event);&#xA;        if (eventType === &#x27;error&#x27;) {&#xA;            console.error(video.error);//https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/error&#xA;        }&#xA;    });&#xA;});&#xA;

    &#xA;

    I see in the console log :

    &#xA;

    loadstart, {"isTrusted":true}&#xA;progress, {"isTrusted":true}&#xA;play, {"isTrusted":true}&#xA;waiting, {"isTrusted":true}&#xA;error, {"isTrusted":true}&#xA;video.error, {}&#xA;

    &#xA;

    I don't know how to find more details about the error.

    &#xA;

    Note that even though Windows Chrome successfully plays the video, it too shows warnings in the console log :

    &#xA;

    {"type":"mediaError","details":"fragParsingError","fatal":false,"reason":"TS packet did not start with 0x47","frag":{"...&#xA;{"type":"mediaError","details":"fragParsingError","fatal":false,"reason":"no audio/video samples found","frag":{...&#xA;

    &#xA;

    Where is my problem ?

    &#xA;