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Thread: video artefacts when seeking

  1. #1
    Join Date
    Nov 2014
    Posts
    1

    Default video artefacts when seeking

    Hello,

    we use in our intranet the Wowza Media Server for vod streaming.
    With files encoded from a SDI Source (Decklink Blackmagic) everything works fine.
    With Files encodec from DVB-S we have video artefacts when seeking.
    It seems that the wowza-Server does not seek to next I-Frame. After a I-Frame the Video is OK

    Software: Wowza Media Server 3.6.2 build5334
    JW-Player 6.9.4867
    ffmpeg version 2.4.git built on Sep 26 2014

    example Files
    https://www.dropbox.com/sh/b0tkauy96...Fxu6_ha?dl=0#/

    ffmpeg -y -i /var/ramdisk/$sender-$jahr-$monat-$tag-$stunde.mpg -nostdin -c:v libx264 -g 25 -aspect 16:9 -movflags faststart \
    -crf $videodatenrate -c:a aac -ab $audiodatenrate -async 1 -strict -2 -vf crop=in_w-2*4:in_h-2*4,yadif=2:-1:0,scale=1008:568 \
    -threads 0 -loglevel info /var/ramdisk/$sender-$jahr-$monat-$tag-$stunde.mp4

    thank you

    J.Grill

  2. #2

    Default

    Hello there and welcome to the Wowza support forum.

    This is usually caused by a lack of keyframes within the source file and/or bandwidth which is close to that of the stream. When seeking Wowza needs to clear the current buffer to the client before seeking, so this may take longer than expected due to bandwidth constraints, and it may not always be to a keyframe thus you can get artifacts and only when the next keyframe arrives does the picture get fully reset.

    For RTMP clients you can add this Property to your application:
    How to enable enhanced seeking for RTMP playback

    Kind regards,

    Salvadore

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