Marco Bux
lvl.2
Italy
Offline
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Hi, Finlayson. Thank you very much for your software. You saved me and my last video and you permitted me to edit and post it on youtube. Great!
I would like to add a little contribution about the recovery process, based on my recent experience.
To edit these kind of videos, I always use AviDemux, with which I only make cuts of segments without any other effects. Every cut is strictly made across the key frames, so that I can save the resultant video as a copy, without any recoding. While editing the repaired video I noticed that, once uploaded to youtube, the image transitions were "disturbed". For example, when a video segment called "A" is attached to a video segment called "B", the transition is like:
...AAABABBB... instead of: ...AAAABBBB....
This is probably due to a imprecise indexing of the key frames within the repaired file (I suppose). In any case I fixed this issue by recoding the video before the edit process, forcing a keyframe every second (keyint=25). In this way I was able to cut my video with a quite good precision, respecting the (new) keyframes. This is the complete h264 setting that I used for recoding, configured to minimize the quality loss:
- cabac=1 / ref=16 / deblock=1:-2:-2 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.25 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=6,6 / fast_pskip=1 / chroma_qp_offset=-4 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=0 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=8 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=25 / keyint_min=13 / scenecut=40 / intra_refresh=0 / rc_lookahead=25 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.80 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.10 / aq=1:0.50
After that I was able to cut, edit and upload the resultant video, and youtube has not detected flaws anymore.
Hope this can help.
Thanks again.
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