Solveig Multimedia Forum - Get help for video editing software
SolveigMM End-User Products => Video Splitter => Topic started by: Berni11 on September 23, 2017, 12:00:54 AM
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Hello,
I stumbled upon the following bug, when cutting Mpeg-2 video:
I have TV-recordings, which have the following frame structure:
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
When cutting before the I-Frame:
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^
The last two frames, which should be included (two B-Frames) get omitted.
Or when cutting before the B-Frame before the I-Frame:
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^
The last frame, which should be included (one B-Frames) gets omitted.
Also I had this strange inconsistent behaviour when cutting h264 TV-recordings:
When the output should have an even number of frames, then often the last frame gets omitted. But sometimes the last frame is there.
When the output should have an odd number of frames, then often all frames are there, but the last two or three frames have no audio.
I hope everything is understandable.
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Hi Berni,
Could you show at your scheme start-stop frames you set cutting cues to?
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For the Mpeg-2 cuts:
I had tested it with the following start and end cuts:
As the start cut I used the "End Marker"
As the end cut I used the "Begin Marker"
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected 13 frames
result: 11 frames
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected 12 frames
result: 11 frames
I also tested the following cuts, where sometimes too much frames were outputted.
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected 12 frames
result: 10 frames
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected 11 frames
result: 10 frames
________________________________________________________________________
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 11 frames
result: 14 frames
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 10 frames
result: 14 frames
________________________________________________________________________
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 10 frames
result: 13 frames
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 9 frames
result: 13 frames
________________________________________________________________________
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 9 frames
result: 12 frames
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 8 frames
result: 12 frames
________________________________________________________________________
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 8 frames
result: 11 frames
... I B B P B B P B B P B B I B B P B B P B B P B B I B B P B B P B B P B B I ...
^ ^
start cut end cut
expected: 7 frames
result: 11 frames
For the h264 cuts I had the start cut before an I-Frame
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Hello Berni11,
Thank you for such a detailed description.
We reproduced some cases described here and will check the others.
As soon as there will be a fix I'll let you know.