Avidemux cut points not on keyframes
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For example, if we look at the following sequence of pictures that are chronologically ordered: I B B P
#Avidemux cut points not on keyframes full#
This means that a full image can be calculated for the current frame at any time because each frame that contains necessary data is placed in the stream before the current frame. In a h264 stream, frames appear in decode order. One might think that it should be possible to cut after a P-frame as it only needs prior frames but this is also not possible in every case as we will learn in the following sections.Īs mentioned, h264 streams may not only contain different types of frames but also frames that are not chronologically ordered. Therefore, you cannot cut after a B-frame as it might need the data of frames that come afterwards. While P-frames only depend on prior frames, B-frames also depend on subsequent frames. Then, the P- and B-frames only contain the changes from the initial I-frame. This is especially beneficial if parts of the picture do not change for some time, e.g., in a static scene. Hence, those other frames are required to create a picture ready for presentation from a B- or P-frame. However, P- and B-frames do not contain a complete image and depend on the data in other frames. If your stream only contains I-frames, you could simply cut the stream after each frame as explained in the beginning. B frame (bidirectionally predictive coded)Īn I-frame is a so-called key frame that contains a complete picture.A h264 stream may contain the following frame types: For recent codecs like h264, however, this is not as simple as such video streams use inter frame prediction and contain different types of frames that are not chronologically ordered. With many audio und video codecs, streams can be cut by simply truncating them at the desired position, e.g., after the last or before the first video frame one wants to keep. Please note, the description below might not be fully accurate in every case but it should give you a good idea of the problems and possible solutions. In the following, I describe what I learned while analyzing the problem and writing an own tool to cut my videos. However, the tools I knew didn't work accurately or had other drawbacks with those specific types of videos. Some time ago, I tried to cut video files at specific timestamps.
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