2015-08-03 21:53 GMT+09:00 wm4 <nfx...@googlemail.com>: > On Mon, 3 Aug 2015 10:32:02 +0000 (UTC) > Carl Eugen Hoyos <ceho...@ag.or.at> wrote: > > > Paul B Mahol <onemda <at> gmail.com> writes: > > > > > > Attached patch fixes ticket #4747 for me, > > > > > > I don't know how to detect that the wave > > > > atom contains no frma / alac atom... > > > > > > And that is mentioned because? > > > > The file from ticket #4747 does not contain an > > alac atom which is required for alac decoding. > > Instead it contains the necessary data in the > > wave atom (where you normally would find the > > alac atom). To distinguish, it would be > > necessary to look "into" the wave atom to know > > if it contains an alac atom or not. > > > > I meanwhile found that the mpeg demuxer > > sometimes seeks eight bytes back which I will > > probably copy. The alternative, iiuc, would be > > to copy the whole wave atom into a buffer and > > call mov_read_default() from the wave_read() > > function with that buffer. > > But this should not be necessary if somebody > > can confirm that it is ok to seek back x bytes > > in a demuxer. > > > > As an alternative the current version could > > also be committed, I am not sure. > > What produced that file?
According to an udta atom, it is produced by Sound Grinder 3.4.6. Does QuickTime play it? Why is there even a > wave header? > wave atom != wave header In QuickTime file formats, codec specific info of compressed audio are stored in wave atom as container atom, and inserted between frma atom and terminator atom. I doubt that QuickTime can play it. > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
