![]() ![]() I personally use the command line tool gifsicle. (Checks if the image is already fixed first. How to make an animated gif from the frames There are many ways to make animated gifs from frames. This makes copy of the image.gif as _image.gif with needed string inserted after colours table and prints out new src url. $end = substr($data, 13 + $colours_length) įile_put_contents($new_filename, $start. $start = substr($data, 0, 13 + $colours_length) put netscape string after 13 + colours table length $bin = str_pad($bin, 8, 0, STR_PAD_LEFT) $data = file_get_contents($GLOBALS.$image) put your images relative/absolute url here, eg '' ![]() put your images absolute path here eg '/var/// or use autodetection below * as this is written as a part of framework, there are some config options * gif image loop fixer, prints image full url Wrote PHP gif fixer based on answer by Spektre: /** portion, insert the following hex, marked as the "application extension" in the photo above: 21 FF 0B 4E 45 54 53 43 41 50 45 32 2E 30 03 01 00 00 00Īddon by Spektre: Beware: 21 F9 marks gfx extension chunk which is optional so it may not be present for all or any frames (but that is really rare these days). Yours could be slightly different, but notice it comes before 2C, which marks the beginning of an image block.īefore the 21 F9. Search for 21 F9 in the beginning portions of hex (this is the header). You can also do it manually with a Hex Editor. Decode data bytes of GIF87a raster data stream.How to find where does Image Block start in GIF images?.Which can be done with C++ or any other language (no re-encoding is needed). I put it directly after header + palette. The GIF is not sensitive on inserting/reordering non-image chunks of data, so you can insert this before the first image in any place between any other extension. This will force browsers to loop endlessly. So the solution is to add this extension command just before first frame image data. Instead they are depending on an undocumented application extension in the first frame of GIF file. Affected browsers are Opera, IE, and Chrome (didn't test others).Īfter some investigation on the matter (by comparing looping and non-looping images), I found out that these browsers' GIF decoders are ignoring the looping parameters in GIF files. The GIF is completely fine the problem is on a modern internet browser's side. gif > c3. I found out the solution for this just yesterday. I tried and It didn't work, but then I tried re-stitching my gif from the frames from scratch gifsicle -loop -delay2 -disposalprevious. I was facing the same problem with my GIF encoder/decoder class I wrote some time ago (and improving from time to time). ![]()
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