Hi,
You should update your mlt version this one that you are using is old
(0.8.0)
https://answers.launchpad.net/openshot/+faq/1861

Check to the Debian multimedia repository side

2014-11-20 5:54 GMT+01:00 Shawn <email address hidden>:

> Public bug reported:
>
> When I start a new project and add my video files the preview works.
>
> Once I get to maybe 7 or 8 clips added into the timeline, it will no
> longer show the preview in the preview window (it is black) but the
> audio plays.
>
> I have tried installing from apt and from source.
>
> Once the preview stops working in the project it stops for good
> regardless of reopening the same project file.
>
> Debian Squeeze 64-bit
> Linux ns2.shawnread.ca 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u1 x86_64
> GNU/Linux
>
> apt, debs, and source
>
> No LADSPA plugins were found!
> Check your LADSPA_PATH environment variable.
> melt 0.8.0
>
> ffmpeg version N-67826-g4ffec6d Copyright (c) 2000-2014 the FFmpeg
> developers
>   built on Nov 19 2014 10:49:12 with gcc 4.7 (Debian 4.7.2-5)
>   configuration:
>   libavutil      54. 14.100 / 54. 14.100
>   libavcodec     56. 12.101 / 56. 12.101
>   libavformat    56. 14.100 / 56. 14.100
>   libavdevice    56.  3.100 / 56.  3.100
>   libavfilter     5.  2.103 /  5.  2.103
>   libswscale      3.  1.101 /  3.  1.101
>   libswresample   1.  1.100 /  1.  1.100
>
> OpenShot 1.4.4~alpha1
>
> Yes both ffplay and melt work video and audio. Video info is:
>
> root@ns2:~/Desktop/GUATEMALA/1# ffmpeg -i 00005.MTS
> ffmpeg version N-67826-g4ffec6d Copyright (c) 2000-2014 the FFmpeg
> developers
>   built on Nov 19 2014 10:49:12 with gcc 4.7 (Debian 4.7.2-5)
>   configuration:
>   libavutil      54. 14.100 / 54. 14.100
>   libavcodec     56. 12.101 / 56. 12.101
>   libavformat    56. 14.100 / 56. 14.100
>   libavdevice    56.  3.100 / 56.  3.100
>   libavfilter     5.  2.103 /  5.  2.103
>   libswscale      3.  1.101 /  3.  1.101
>   libswresample   1.  1.100 /  1.  1.100
> Input #0, mpegts, from '00005.MTS':
>   Duration: 00:00:04.03, start: 0.519389, bitrate: 15152 kb/s
>   Program 1
>     Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p,
> 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>     Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
> fltp, 256 kb/s
> At least one output file must be specified
>
> ** Affects: openshot
>      Importance: Undecided
>          Status: New
>
> --
> You received this bug notification because you are a member of OpenShot
> Bugs, which is subscribed to OpenShot Video Editor.
> https://bugs.launchpad.net/bugs/1394452
>
> Title:
>   preview blank
>
> Status in OpenShot Video Editor:
>   New
>
> Bug description:
>   When I start a new project and add my video files the preview works.
>
>   Once I get to maybe 7 or 8 clips added into the timeline, it will no
>   longer show the preview in the preview window (it is black) but the
>   audio plays.
>
>   I have tried installing from apt and from source.
>
>   Once the preview stops working in the project it stops for good
>   regardless of reopening the same project file.
>
>   Debian Squeeze 64-bit
>   Linux ns2.shawnread.ca 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u1
> x86_64 GNU/Linux
>
>   apt, debs, and source
>
>   No LADSPA plugins were found!
>   Check your LADSPA_PATH environment variable.
>   melt 0.8.0
>
>   ffmpeg version N-67826-g4ffec6d Copyright (c) 2000-2014 the FFmpeg
> developers
>     built on Nov 19 2014 10:49:12 with gcc 4.7 (Debian 4.7.2-5)
>     configuration:
>     libavutil      54. 14.100 / 54. 14.100
>     libavcodec     56. 12.101 / 56. 12.101
>     libavformat    56. 14.100 / 56. 14.100
>     libavdevice    56.  3.100 / 56.  3.100
>     libavfilter     5.  2.103 /  5.  2.103
>     libswscale      3.  1.101 /  3.  1.101
>     libswresample   1.  1.100 /  1.  1.100
>
>   OpenShot 1.4.4~alpha1
>
>   Yes both ffplay and melt work video and audio. Video info is:
>
>   root@ns2:~/Desktop/GUATEMALA/1# ffmpeg -i 00005.MTS
>   ffmpeg version N-67826-g4ffec6d Copyright (c) 2000-2014 the FFmpeg
> developers
>     built on Nov 19 2014 10:49:12 with gcc 4.7 (Debian 4.7.2-5)
>     configuration:
>     libavutil      54. 14.100 / 54. 14.100
>     libavcodec     56. 12.101 / 56. 12.101
>     libavformat    56. 14.100 / 56. 14.100
>     libavdevice    56.  3.100 / 56.  3.100
>     libavfilter     5.  2.103 /  5.  2.103
>     libswscale      3.  1.101 /  3.  1.101
>     libswresample   1.  1.100 /  1.  1.100
>   Input #0, mpegts, from '00005.MTS':
>     Duration: 00:00:04.03, start: 0.519389, bitrate: 15152 kb/s
>     Program 1
>       Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
> yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94
> tbc
>       Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
> stereo, fltp, 256 kb/s
>   At least one output file must be specified
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/openshot/+bug/1394452/+subscriptions
>
> --
> Mailing list: https://launchpad.net/~openshot.bugs
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>



-- 
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