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• Revision 5379 : prise en compte des trucs moches genre le form de conf de contact avancé

  21 avril 2011, par kent1 — Log

  prise en compte des trucs moches genre le form de conf de contact avancé

• Evolution #2923 (Nouveau) : Remplacement d’un document et date du document

  19 décembre 2012, par - Equipement

  Bonjour, Lors du remplacement d’un document, SPIP garde la date d’origine. Des rédacteurs se plaignent car, lorsqu’ils remplacent un document par une version plus récente, ils veulent que ce soit la date du dépôt de la dernière version qui soit prise en compte. Comme la Charte Internet de l’Etat (...)

• How to apply dynamic watermarking for users watching video in real-time ? [closed]

  3 janvier, par Barun Bhattacharjee

  I am working on a video streaming project where I need to apply a dynamic watermarking (e.g., username and email) in real-time for security purposes. The video is being streamed in DASH format, and the segment files are in .m4s format generated via FFmpeg.

  


  Challenges :
Is it possible to directly apply dynamic watermarking to .m4s segment files ?

  


  Video segments are generated using FFmpeg with the following command :

  


  ffmpeg
    .input(video_path)
    .output(mpd_path,
            format='dash',
            map='0',
            video_bitrate='2400k',
            video_size='1920x1080',
            vcodec='libx264',
            seg_duration='4',  # Sets segment duration to 4 seconds
            acodec='copy')
    .run()



  


  What I tried :
I attempted to use FFmpeg to apply a watermark dynamically to the .m4s files using the drawtext filter, but .m4s files are not always recognized as valid input for FFmpeg operations.

  


  # FFmpeg command to add watermark to m4s file
try:
    # FFmpeg processing
    out, err = (
        ffmpeg
        .input(m4s_file_path)  # Input the segment file
        .filter(
            "drawtext",
            text=user_info,
            fontfile="font/dejavu-sans/DejaVuSans-Bold.ttf",
            fontsize=24,
            fontcolor="white",
            x=10,
            y=10
        )
        .output(
            "pipe:",  # Stream output as a byte stream
            format="mp4",  # Output format as MP4 (compatible with MPEG-DASH)
            vcodec="libx264",
            acodec="copy",
            movflags="frag_keyframe+empty_moov"
        )
        .run(capture_stdout=True, capture_stderr=True)
    )

    logger.info(f"FFmpeg process completed. stdout length: {len(out)}, stderr: {err.decode('utf-8')}")
    logger.error(f"FFmpeg stderr: {err.decode('utf-8')}")
    return out  # Return the processed video stream data


except ffmpeg.Error as e:
    stderr_output = e.stderr.decode('utf-8') if e.stderr else "No stderr available"
    logger.error(f"FFmpeg error: {stderr_output}")

    raise RuntimeError(f"Error processing video: {stderr_output}")



  


  Error I faced :

  


  video-streaming-backend  | [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f1bf99cc640] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none(tv, bt709), 1920x1012): unspecified pixel format
video-streaming-backend  | Consider increasing the value for the 'analyzeduration' (10000000) and 'probesize' (5000000) options
video-streaming-backend  | Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://web:8000/media/stream_video/chunks/ec1db006-b488-47ad-8220-79a05bcaae39/segments/init-stream0.m4s':
video-streaming-backend  |   Metadata:
video-streaming-backend  |     major_brand     : iso5
video-streaming-backend  |     minor_version   : 512
video-streaming-backend  |     compatible_brands: iso5iso6mp41
video-streaming-backend  |     encoder         : Lavf60.16.100
video-streaming-backend  |   Duration: N/A, bitrate: N/A
video-streaming-backend  |   Stream #0:0[0x1](und): Video: h264 (avc1 / 0x31637661), none(tv, bt709), 1920x1012, SAR 1:1 DAR 480:253, 12288 tbr, 12288 tbn (default)
video-streaming-backend  |     Metadata:
video-streaming-backend  |       handler_name    : VideoHandler
video-streaming-backend  |       vendor_id       : [0][0][0][0]
video-streaming-backend  | Stream mapping:
video-streaming-backend  |   Stream #0:0 (h264) -> drawtext:default
video-streaming-backend  |   drawtext:default -> Stream #0:0 (libx264)
video-streaming-backend  | Press [q] to stop, [?] for help
video-streaming-backend  | Cannot determine format of input stream 0:0 after EOF
video-streaming-backend  | Error marking filters as finished
video-streaming-backend  | Error while filtering: Invalid data found when processing input
video-streaming-backend  | [out#0/mp4 @ 0x7f1bf8e73100] Nothing was written into output file, because at least one of its streams received no packets.
video-streaming-backend  | frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A    
video-streaming-backend  | Conversion failed!



  


  These errors have left me wondering if .m4s is a viable format for dynamic watermarking. If it's not, what would be the correct approach ?