On Thu, Jan 25, 2024 at 1:27 AM Tomas Härdin <g...@haerdin.se> wrote:
> tor 2024-01-25 klockan 01:09 +0300 skrev Victor Luchitz: > > In our case, the machine we're targeting (the Sega 32X) has only > > 256KB > > of RAM. Even more modern consoles such as XBOX or even PS3 didn't > > have enough RAM to hold an entire CD-ROM.. > > > > We also have to be concerned about how fast we can move data to the > > main CPU. Say you make the first frame BIG to make it look its best, > > then > > compensate with much smaller delta frames... is the first frame too > > much > > data to move to the CPU quick enough? Well, maybe not an issue for > > the > > first frame, but definitely an issue for keyframes in the middle of > > the > > stream. > > Ah, that makes a lot more sense. Yeah I can see that being an issue. > And decoding time probably depends on packet size as well, so even if > you could move data around in advance, this still doesn't help that > keyframe decode any faster. I've seen similar behavior with JPEG2000 > where decode time scales linearly with bitrate (plus a fixed overhead). > > One thing that strikes me is if you're only aiming for linear playback > then you can set the GOP size large enough that the encoder is never > forced to insert a keyframe. > > I think my main issue then comes down to the qscale search being way > too slow, especially the fact that it can effectively hang. I would > suggest a binary search using the heuristic I derived for the first > split, or something similar. Searching between 1 and 100000000 seems > excessive in most cases. It should be possible to box that interval in > quickly, again using the heuristic. > Alright, we'll look into it, thanks! > > /Tomas > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > -- Best regards, Victor Luchitz _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
