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[Bug 1547477] [NEW] timeline preview and export quality is poor compared to asset preview

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Public bug reported:

GNU/Linux Slackware 14.1 32 Bit
Openshot 1.4.3  installed via slackbuilds.org script
MLT version 0.9.6  FFMpeg 2.6.3  both installed via slackbuilds.org script

This may or may not be a bug, I am not qualified to say and I do not
know enough about debugging, sorry. Indeed this may be a MELT problem.

Following posting on the forum, I downgraded MELT to 0.9.2 and this
particular problem (see below) was not present. I switched back to 0.9.6
and even to 0.9.8 and the problem returned.

Sequence of images (1 per frame) imported as a sequence into the asset
section of Openshot.

Right click on the asset and select 'preview' and the the sequence plays
in the video preview. The quality is as per the imported images (as far
as I can tell) and appears ok.

Drag the image sequence from the asset section down onto the timeline.
Press play to output the timeline in the video preview.
The quality of the playback is degraded and so different from the preview of the asset (as detailed above).
If the video is exported, the quality is also poor and looks more or less like it did in the timeline preview, as one would expect.

Selecting a high profile setting makes no difference to the timelibne
preview or export quality.

In summary, the asset preview quality is as it should be, the timeline
and export quality is worse/poor.

Is this a bug, as one would expect the asset preview and the timeline preview to be the same.
Hope that all makes sense.

** Affects: openshot
     Importance: Undecided
         Status: New

** Description changed:

  GNU/Linux Slackware 14.1 32 Bit
  Openshot 1.4.3  installed via slackbuilds.org script
  MLT version 0.9.6  FFMpeg 2.6.3  both installed via slackbuilds.org script
  
- This may or may not be a bug, I am not qualified to say and I do nto know enough about debugging, sorry. 
- Following posting on the forum, I downgraded MLT to 0.9.2 and this particular problem (see below) was not present.
+ This may or may not be a bug, I am not qualified to say and I do not
+ know enough about debugging, sorry. Indeed this may be a MELT problem.
+ 
+ Following posting on the forum, I downgraded MELT to 0.9.2 and this
+ particular problem (see below) was not present. I switched back to 0.9.6
+ and even to 0.9.8 and the problem returned.
  
  Sequence of images (1 per frame) imported as a sequence into the asset
  section of Openshot.
  
  Right click on the asset and select 'preview' and the the sequence plays
  in the video preview. The quality is as per the imported images (as far
  as I can tell) and appears ok.
  
  Drag the image sequence from the asset section down onto the timeline.
  Press play to play the timeline in the video preview.
  The quality of the playback is degraded and so different from the preview of the asset (as detailed above).
  If the video is exported, the quality is also poor and looks more or less like it did in the timeline preview, as one would expect.
  
  Selecting a high profile setting makes no difference to the timelibne
  preview or export quality.
  
  In summary, the asset preview quality is as it should be, the timeline
  and export quality is worse/poor.
  
  Is this a bug, as one would expect the asset preview and the timeline preview to be the same.
  Hope that all makes sense.

** Description changed:

  GNU/Linux Slackware 14.1 32 Bit
  Openshot 1.4.3  installed via slackbuilds.org script
  MLT version 0.9.6  FFMpeg 2.6.3  both installed via slackbuilds.org script
  
  This may or may not be a bug, I am not qualified to say and I do not
  know enough about debugging, sorry. Indeed this may be a MELT problem.
  
  Following posting on the forum, I downgraded MELT to 0.9.2 and this
  particular problem (see below) was not present. I switched back to 0.9.6
  and even to 0.9.8 and the problem returned.
  
  Sequence of images (1 per frame) imported as a sequence into the asset
  section of Openshot.
  
  Right click on the asset and select 'preview' and the the sequence plays
  in the video preview. The quality is as per the imported images (as far
  as I can tell) and appears ok.
  
  Drag the image sequence from the asset section down onto the timeline.
- Press play to play the timeline in the video preview.
+ Press play to output the timeline in the video preview.
  The quality of the playback is degraded and so different from the preview of the asset (as detailed above).
  If the video is exported, the quality is also poor and looks more or less like it did in the timeline preview, as one would expect.
  
  Selecting a high profile setting makes no difference to the timelibne
  preview or export quality.
  
  In summary, the asset preview quality is as it should be, the timeline
  and export quality is worse/poor.
  
  Is this a bug, as one would expect the asset preview and the timeline preview to be the same.
  Hope that all makes sense.

-- 
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Bugs, which is subscribed to OpenShot Video Editor.
https://bugs.launchpad.net/bugs/1547477

Title:
  timeline preview and export quality is poor compared to asset preview

Status in OpenShot Video Editor:
  New

Bug description:
  GNU/Linux Slackware 14.1 32 Bit
  Openshot 1.4.3  installed via slackbuilds.org script
  MLT version 0.9.6  FFMpeg 2.6.3  both installed via slackbuilds.org script

  This may or may not be a bug, I am not qualified to say and I do not
  know enough about debugging, sorry. Indeed this may be a MELT problem.

  Following posting on the forum, I downgraded MELT to 0.9.2 and this
  particular problem (see below) was not present. I switched back to
  0.9.6 and even to 0.9.8 and the problem returned.

  Sequence of images (1 per frame) imported as a sequence into the asset
  section of Openshot.

  Right click on the asset and select 'preview' and the the sequence
  plays in the video preview. The quality is as per the imported images
  (as far as I can tell) and appears ok.

  Drag the image sequence from the asset section down onto the timeline.
  Press play to output the timeline in the video preview.
  The quality of the playback is degraded and so different from the preview of the asset (as detailed above).
  If the video is exported, the quality is also poor and looks more or less like it did in the timeline preview, as one would expect.

  Selecting a high profile setting makes no difference to the timelibne
  preview or export quality.

  In summary, the asset preview quality is as it should be, the timeline
  and export quality is worse/poor.

  Is this a bug, as one would expect the asset preview and the timeline preview to be the same.
  Hope that all makes sense.

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