Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Supported by

Item-stack error

Hello everybody,
i have created an experiment with opensesame which contains videos. The problem is that i cannot run the experiment on my pc, except i delete the videos. When i do that, the experiment runs. On all other pcs, i download opensesame and run the experiment on an usb-stick with the videos without any problems. I downloaded opensesame once again on my pc but i still doesnt work, although my pc is new and all the videos run with for example vlc-player. I always adjust "legacy" . So it has to concern the videos in my experiment but i dont understand the error message. I send you the picture of the message. I hope you have an idea.

Best wishes


  • Hi Felix,

    The crucial part of the error message is at the bottom, that is, the part that we can't see in your screenshot. :wink:

    The best way to post the error message is by simply copy-pasting the full text. You can use ~~~ markers to indicate that something is code when posting on the forum. Like so:

    # Your stacktrace here


    Buy Me A Coffee

  • Hi Sebastiaan,
    i see, lets try this...

     File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libqtopensesame\misc\", line 140, in run
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 413, in run
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 90, in execute
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 122, in prepare
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 124, in prepare
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 122, in prepare
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 124, in prepare
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\", line 122, in prepare
      File "C:\Program Files (x86)\OpenSesame\share\opensesame_plugins\media_player_mpy\", line 119, in prepare
        elif not self.player.load_media(path):
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\mediadecoder\", line 162, in load_media
        self.clip = VideoFileClip(mediafile, audio=play_audio)
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\moviepy\video\io\", line 55, in __init__
        reader = FFMPEG_VideoReader(filename, pix_fmt=pix_fmt)
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\moviepy\video\io\", line 32, in __init__
        infos = ffmpeg_parse_infos(filename, print_infos, check_duration)
      File "C:\Program Files (x86)\OpenSesame\lib\site-packages\moviepy\video\io\", line 250, in ffmpeg_parse_infos
        if "No such file or directory" in lines[-1]:
    IndexError: list index out of range
    Dismiss this message

    Best wishes

  • Hi,

    I get exactly the same error and I was wondering if you have already a solution, since the previous post is pretty old. I checked the preferences and the packages. I cannot understand why the experiment is working in one laptop and not in another one, the one that I have to use during the testing session.

    Do you a solution?


  • This looks like a bug in ffmpeg to me. @Daniel Do you recognize this?

    Buy Me A Coffee

  • Hi Sebastiaan, hi Daniel,

    the problem is still present. Do you have maybe some suggestions? We also tried with different OpenSesame versions and different video files (avi and fls) but the problem persists on that laptop.


  • Hi all,

    Sorry for joining in so late, but this problem indeed appears to originate from within the moviepy module. An update to this module might fix this, but since I haven't updated the media player plugin for a while, I hope a newer moviepy version won't break anything else. In any case, I think it is worth the try.

    According to the instructions from you can update the moviepy module by issuing the following command in the OpenSesame debug window:

    import pip
    pip.main(['install', 'moviepy', '--upgrade'])

    Could you give this a try and let us know how it went here?

    Buy Me A Coffee

Sign In or Register to comment.

agen judi bola , sportbook, casino, togel, number game, singapore, tangkas, basket, slot, poker, dominoqq, agen bola. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 50.000 ,- bonus cashback hingga 10% , diskon togel hingga 66% bisa bermain di android dan IOS kapanpun dan dimana pun. poker , bandarq , aduq, domino qq , dominobet. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 10.000 ,- bonus turnover 0.5% dan bonus referral 20%. Bonus - bonus yang dihadirkan bisa terbilang cukup tinggi dan memuaskan, anda hanya perlu memasang pada situs yang memberikan bursa pasaran terbaik yaitu Bola168. Situs penyedia segala jenis permainan poker online kini semakin banyak ditemukan di Internet, salah satunya TahunQQ merupakan situs Agen Judi Domino66 Dan BandarQ Terpercaya yang mampu memberikan banyak provit bagi bettornya. Permainan Yang Di Sediakan Dewi365 Juga sangat banyak Dan menarik dan Peluang untuk memenangkan Taruhan Judi online ini juga sangat mudah . Mainkan Segera Taruhan Sportbook anda bersama Agen Judi Bola Bersama Dewi365 Kemenangan Anda Berapa pun akan Terbayarkan. Tersedia 9 macam permainan seru yang bisa kamu mainkan hanya di dalam 1 ID saja. Permainan seru yang tersedia seperti Poker, Domino QQ Dan juga BandarQ Online. Semuanya tersedia lengkap hanya di ABGQQ. Situs ABGQQ sangat mudah dimenangkan, kamu juga akan mendapatkan mega bonus dan setiap pemain berhak mendapatkan cashback mingguan. ABGQQ juga telah diakui sebagai Bandar Domino Online yang menjamin sistem FAIR PLAY disetiap permainan yang bisa dimainkan dengan deposit minimal hanya Rp.25.000. DEWI365 adalah Bandar Judi Bola Terpercaya & resmi dan terpercaya di indonesia. Situs judi bola ini menyediakan fasilitas bagi anda untuk dapat bermain memainkan permainan judi bola. Didalam situs ini memiliki berbagai permainan taruhan bola terlengkap seperti Sbobet, yang membuat DEWI365 menjadi situs judi bola terbaik dan terpercaya di Indonesia. Tentunya sebagai situs yang bertugas sebagai Bandar Poker Online pastinya akan berusaha untuk menjaga semua informasi dan keamanan yang terdapat di POKERQQ13. Kotakqq adalah situs Judi Poker Online Terpercayayang menyediakan 9 jenis permainan sakong online, dominoqq, domino99, bandarq, bandar ceme, aduq, poker online, bandar poker, balak66, perang baccarat, dan capsa susun. Dengan minimal deposit withdraw 15.000 Anda sudah bisa memainkan semua permaina pkv games di situs kami. Jackpot besar,Win rate tinggi, Fair play, PKV Games