0

ClassX is an interactive lecture streaming system developed in the Electrical Engineering Department at Stanford University. Unlike conventional lecture capturing systems, ClassX requires very simple consumer-grade equipment and minimal human operation.

I faced problems during installing it, I hope you have a solution.

BTW: I successfully installed it 2 years ago, but now I think the problem as the dependencies and Ubuntu versions are different than the versions we used two years ago.

Detailed description of the problem:

  • I'm using Ubuntu 12.04
  • I followed the instructions @ ClassX installation guide, and all steps till step 4 are successfully done (the encoder bin file generated).
  • When trying to encode the video using the classX web system, it shows the encoding completed after few seconds.However, there are no tiles generated.

  • I tried to execute the command at CX_log.txt, and the following error appears.

    mahmoud@Mahmoud-HP-Pavilion-dv5-Notebook-PC:~$ sudo perl /var/www/ClassXWebSystem/system/publishers/web/actions/encode.pl "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251" "/var/www/ClassXWebSystem/content/streaming/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/system/publishers/bin" classx y n n [sudo] password for mahmoud: 00068.jpg .. . 00068.mp4 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/00068.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf52.39.0 Duration: 00:02:30.05, start: 0.000000, bitrate: 8141 kb/s Stream #0.0(und): Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 8007 kb/s, 29.95 fps, 29.97 tbr, 2997 tbn, 59.94 tbc Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 128 kb/s Output #0, mp4, to '/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/stream0.mp4': Stream #0.0: Video: [0][0][0][0] / 0x0000, yuv420p, 640x360, q=32-36, 64 kb/s, 90k tbn, 14.99 tbc codec not found

Improve this question
1
  • You should find out what the actual ffmpeg command is and also provide the complete ffmpeg console output. Then properly format it by highlighting it and pressing ctrl+k or by using the code button.
    – llogan
    Mar 23, 2014 at 17:47

1 Answer 1

Reset to default
0

Did you install ffmpeg exactly as stated in the guide, by compiling it from source with the required options?

Improve this answer
1
  • This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post.
    – hichris123
    Mar 25, 2014 at 1:02

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.