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gif2webp: force low duration frames to 100ms

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this is consistent with web browser behavior as well as various
transcoding tools (ffmpeg, gif2apng, etc).

also: update anim_diff to account for this new behaviour.

BUG=webp:379

Change-Id: I70cc72a6b401ef32b73cd182a3f12d993d495bf4
This commit is contained in:
James Zern
2018-03-23 22:48:17 -07:00
committed by Pascal Massimino
parent b2db361ca6
commit 09333097ed
2 changed files with 11 additions and 0 deletions
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8
examples/gif2webp.c
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@ -361,6 +361,14 @@ int main(int argc, const char *argv[]) {
GIFDisposeFrame(orig_dispose, &gif_rect, &prev_canvas, &curr_canvas);
GIFCopyPixels(&curr_canvas, &prev_canvas);
// Force frames with a small or no duration to 100ms to be consistent
// with web browsers and other transcoding tools. This also avoids
// incorrect durations between frames when padding frames are
// discarded.
if (frame_duration <= 10) {
frame_duration = 100;
}
// Update timestamp (for next frame).
frame_timestamp += frame_duration;