Am Do., 12. März 2020 um 01:11 Uhr schrieb Ulf Zibis <[email protected]>: > > > Am 12.03.20 um 00:07 schrieb Carl Eugen Hoyos: > > Am Mi., 11. März 2020 um 23:56 Uhr schrieb Ulf Zibis <[email protected]>: > > > >> compatible_brands: qt CAEP > > What happens if you remove CAEP with a binary editor? > > When I replace CAEP in the original video with 4 0x00 it is still playable.
Ok. What happens if you change the minor version number? > Here are the first 32 bytes of the original: > 00 00 00 18 66 74 79 70 71 74 20 20 20 07 09 00 71 74 20 20 43 41 45 50 > 00 01 7F E8 6D 6F 6F 76 ....ftypqt ...qt CAEP...èmoov > > Here replaced with 4 0x00: > 00 00 00 18 66 74 79 70 71 74 20 20 20 07 09 00 71 74 20 20 00 00 00 00 > 00 01 7F E8 6D 6F 6F 76 ....ftypqt ...qt .......èmoov > > Here are the first 32 bytes from ffmpeg: > 00 00 00 14 66 74 79 70 71 74 20 20 00 00 02 00 71 74 20 20 00 00 00 08 > 77 69 64 65 01 67 16 A6 ....ftypqt ....qt ....wide.g.¦ > > As you can see: > - the magic number (the first 4 bytes) is different, why? There is no "magic number" in the (general) context of multimedia files. Longer brand strings make the ftyp atom longer. Did you already test the following? $ ffmpeg -i MVI_1324.MOV -acodec copy -vcodec copy out.mov Carl Eugen _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
