jerkiness in video on using phonon on windows
lilesh.ghadi at geodesic.com
Fri Nov 20 15:25:08 GMT 2009
We are subclassing QIODevice to pass audio-video data to a custom parser
(a Directshow filter implementation) using Phonon. Phonon creates a
graph that includes the custom parser and corresponding audio-video
decoders and rendering filters. The custom parser internally separates
audio and video, which is then decoded and rendered.
When this sequence is played, jerkiness is observed periodically (spaced
every 2-3 seconds). By video jerkiness, I mean that previous frame is
again rendered causing a break in continuous viewing. It is important to
note that there is no break in audio.
When the same file with the custom format is drag-n-dropped in to
Graphedit, it automatically creates a pipeline and renders audio-video
data satisfactorily (meaning no jerkiness and in audio-video
synchronization). From this, we have concluded that the directshow
filters by themselves do not have any bug and perform correctly.
We are unable to figure out why this behaviour is observed on using
phonon in windows. Any help/suggestions in this matter will be appreciated.
Lead Technologist | MunduTV
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