Under 0.8.15, I cannot Go to Previous Frame in an MTS file, using mouse or left arrow. Go to Next Frame is fine.
In an AVI, Go to Previous frame is much slower than Got to next Frame (~ 4s). Win XP SP3.
Also, MTS file video seems to correctly advance a frame at a time (I think), but time display doesn't ... 00.52, 0.56, 0.68, 0.64, 0.76, 0.72, 0.84 ....
Earlier version also had this problem.
Great program BTW !
- joan
- Admin
- Offline
Hi,
Yes there are some known issues with the MTS files. You may need to restrict the working zone until it triggers the "analysis mode" (pre-extraction of frames into memory). Depending on image size / frame rate, this can be as low as 2.5 seconds.
Generally speaking, the difference between forward and backward frame by frame comes from the way the images are encoded inside the file. Some codecs use intra frame coding only (each image is compressed separately from the others) others use inter frame compression, which means for us that a given image can only be reconstructed after we also decompress another image. When we go backward, we actually need to go back a few frames first (back to the last full frame), and then decode all the frames inbetween.
There is also issues with some containers that do not index the images (VOB), or index them in a bizarre way (MTS).
Bottom line is :
- Some files are more suited to going backwards in the same ammount of time than forward.
- To even out the differences you can restrict the working zone to trigger the pre extraction of frames into memory.
- You can convert the files to a more suitable format using such tools as AviDemux or HandBrake.