When Gens splits videos at 2GB, a video frame is lost at each split. There is no correct way to fix this, other than to use a lossless codec which compresses well enough to avoid making the split in the first place.
at page: http://tasvideos.org/EncodingGuide/VideoDumping.html#GensAll information below is for gens-rerecording.
I was encoding 10000 frames of several movies, each avi was split into approximately 50 parts.
From my tests, it turns out that nothing is lost, if you have turned off FrameSkip and you have CleanAVI option turned on.
Issue comes from different moments of time when sound and image is coded into avi.
All data is stored. Audio of last frame may be placed in next avi, thus having bad effect for some muxers that you'll use during concatenation.
For example, you're using ffmpeg concat demuxer. You have file qwe.txt with content:
file 'g:\dedede\Demolition Man (UE) [!].avi'
file 'g:\dedede\Demolition Man (UE) [!]002.avi'
file 'g:\dedede\Demolition Man (UE) [!]003.avi'
...
and then you use ffmpeg -f concat -i qwe.txt ...
if you encode both video and audio, ffmpeg will try to sync all stuff and it will bend audio to match video.
but if you extract all audio like this:
ffmpeg -i "Demolition Man (UE) [!].avi" 001.wav
ffmpeg -i "Demolition Man (UE) [!]002.avi" 002.wav
...
and then concatenate all audio using concat demuxer file:
file 001.wav
file 002.wav
file 003.wav
...
then encode video and audio separately and mux -> you'll get correct encode.
this is ugly approach.
there is better.
just use same qwe.txt with all avi to encode whole video with no sound using concat demuxer,
then use same qwe.txt with all avi to encode whole sound without video using concat demuxer
and then mux it.
last step is ultra fast.
I was using ffmpeg-20180418-223f3df-win64-static
other way is to use avisynth:
avisource("Demolition Man (UE) [!].avi")avisource("Demolition Man (UE) [!].avi")+avisource("Demolition Man (UE) [!]002.avi")+avisource("Demolition Man (UE) [!]003.avi")...
it will work fine.
Now, appendix:
in old gens rerecording like gens-rerecording 11, if you have frameskip, you'll have not-updated frames in encode. For example for frameskip = 8 you'll have 8 identical frames each 8 frames. In other words, each skipped frame will be duplicate of previous non-skipped frame. But if you turn on CleanAVI option, it may fix it.
Also funny note, that encode works well even with latency-compensation and sonic tas tools while they draw collision overlay :o
Never liked splitted encodes. Who needs them? You have to spend more time on joining them afterwards because noone will like a movie that stops in the heat of the game.
Oh, nevermind, nice work ;-)
TASing is like making a film: only the best takes are shown in the final movie.
Splitted encodes are inevitable if you have long run.
Or if you have big resolution.
Gens never had big resolution, but I'm planning to do atlas encodes with it so I had to investigate bugs involved.
Joined: 10/12/2011
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Fun fact. At every split the audio/video should progressively desync.
And a suggestion to this, there's a very obscure lossless codec that exists. Ut Video.
Crazy Amounts of Colours not Big Resolution for Genesis that is (just letting you know).
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Finally someone has researched it!
The trick with avisynth command here is that it splices video and audio independently and then muxes them. + means UnalignedSplice() which we need here. If we do ++, it's AlignedSplice() and it splices segments preserving the gaps in audio and video.
http://avisynth.nl/index.php/Splice
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