On Sun, Sep 13, 2015 at 09:25:17PM +0200, Peter B. wrote: > Hello again :) > > I've just noticed that by default, FFV1 chooses version "0". > I thought it would be "1". > > When adding "-level 1" it properly shows "ver:1". > (and a proper value for "bps") > > > == For example: > > Source video: https://media.xiph.org/video/derf/y4m/football_422_ntsc.y4m > > $ ffmpeg -i input.avi -c:v ffv1 -an output.avi > $ ffprobe -debug 1 -i output.avi > > Shows: > [ffv1 @ 0x2263b80] ver:0 keyframe:1 coder:0 ec:0 slices:1 bps:0 > > > On the other hand: > $ ffmpeg -i input.avi -c:v ffv1 -level 1 -an output.avi > $ ffprobe -debug 1 -i output.avi > > Shows: > [ffv1 @ 0x2c9eb80] ver:1 keyframe:1 coder:0 ec:0 slices:1 bps:8 > > > Interestingly, the console output of both commands seems identical. > Why is that so?
the encoder chooses the lowest version that supports the requested features well to maximize compatibility [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Awnsering whenever a program halts or runs forever is On a turing machine, in general impossible (turings halting problem). On any real computer, always possible as a real computer has a finite number of states N, and will either halt in less than N cycles or never halt.
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