Diadem - CLIP: Warum "läuft" ein MPEG2 - Video im Windows-Media-Player und nicht in Diadem - Clip?

Zuerst konnten der Windows-Media-player und Diadem-CLIP das mpg-file beide nicht darstellen, während andere Video-player einwandfrei arbeiteten.
Beide Programme zeigten kein Bild.
Nach der Installation eines neuen Codecs konnte der Windows Media-player das file wiedergeben, im Diadem-CLIP ist jedoch jetzt immer nur ein Standbild zu sehen, obwohl der Sekundenzähler in der Diadem-Clip -Playerleiste läuft.

Clip muss, verglichen mit dem Media Player oder anderen Abspielern, mit ganz anderen Mechanismen auf das mpeg zugreifen. Das hängt mit des Synchronisation des Filmes zusammen. Zu einem ganz bestimmten Zeitpunkt x muss ein Frame aus dem Film extrahiert und dargestellt werden.
Nun hängt es vom Kompression einer mpeg Datei ab, wie schnell dieser Vorgang durchgeführt werden kann. Je stärker die Datei komprimiert ist, desto langsamer wird der Zugriff und wenn die Frames nicht rechtzeitig dargestellt werden, bleibt ein Standbild übrig. Sie werden wahrscheinlich sehen, dass wenn Sie die Geschwindigkeit ganz runterdrehen, der Film laufen wird.
Um die Sache zu beschleunigen, müssen Sie das mpeg neu codieren. Dabei gibt es einen Parameter, der sich bei AVI Filmen Keyframe nennt
- bei mpegs wahrscheinlich ähnlich. Wird die Anzahl der Keyframes erhöht, bzw ihr zeitliche Abstand verringert, müsste der Film im CLIP besser durchlaufen.
Was sind die Keyframes?
Bei der Kompression eines Filmes wird nicht jeder Frame gespeichert. Vielmehr werden Ausgehend von einem komplett gespeicherten Keyframe in den folgenden Frames nur die Veränderungen im Bild abgespeichert. Das spart natürlich enorm Speicherplatz und funktioniert auch sehr gut, wenn man wie im Media Player üblich, den Film vorwärts anschaut. CLIP sucht sich jedoch zum Zeitpunkt x ein Bild. Wenn die Datei aber zu diesem Zeitpunkt nicht zufällig einen Keyframe aufweist, muss der zuletzt gespeicherte Keyframe in der Datei gefunden, und mit den darauffolgenden Informationen bis zum Zeitpunkt x verrechnet werden.
Wenn man sich dessen bewusst ist, wird klar, dass a) der Film in normalen Playern leichter ohne Ruckeln durchläuft und b) eine Erhöhung der Anzahl der Keyframes in der Datei die Situation für CLIP
verbessert.
Ich hoffe, diese Informationen helfen Ihnen weiter.
I.Schumacher
Application Engineering
National Instruments

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Diadem - CLIP: Warum "läuft" ein MPEG2 - Video im Windows-Media-Player und nicht in Diadem - Clip?

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