Reimar Döffinger wrote: > On Tue, Mar 10, 2009 at 02:29:46PM +0300, Igor Katson wrote: > >> The problem is, that when I make a fifo, and send mplayer output to >> -ao pcm:file=fifo, >> and start encoding with oggenc, oggenc looks at the header >> and thinks that the file is only 1 hour length, though it is much more, >> and when an hour is encoded, oggenc just stops the process. >> > > Well, the problem is that it is not possible to put more than one hour > of uncompressed data into wav, since wav specifies the size of the > data as 32 bit values (due to broken sign handling actually 31 bit). > One hour of data is already ca. 2 GB, and thus the limit for wav is > reached (not sure if there are ODML extensions for wav, but even then I > doubt oggenc would support them). > Now as to why FFmpeg works: It just sets all those size values to 0 at > the start, and oggenc obviously has special hacks to ignore that (if it > behaved "correctly" oggenc would not encode a single byte with FFmpeg). > Thanks for a great explanation, Reimar. > Your options: > 1) hack MPlayer, change libao2/ao_pcm.c the lines > >> wavhdr.data_length=le2me_32(0x7ffff000); >> wavhdr.file_length = wavhdr.data_length + sizeof(wavhdr) - 8; >> > to > >> wavhdr.data_length=0; >> wavhdr.file_length = 0; >> > this will most likely break other applications. You could also make a > patch so you can select which method ao_pcm uses. > I don't know C to write acceptable patches, and don't want to use these kind of workarounds, especially regarding that it's not an MPlayer bug. > 2) use FFmpeg's wav writing method via mencoder, something like: > mencoder -oac pcm -novideo -of lavf -lavfopts format=wav -o - > > 3) use AIFF format, though you have to use mencoder for that, too: > mencoder -oac pcm -novideo -of lavf -lavfopts format=aiff -o - > 1. Never knew that mencoder could output to STDOUT and there is nothing about that in the manpage (that's why i was using fifos). Also some of the mplayer/mencoder textual output goes to stdout. 2. In both cases mencoder says that the video stream is mandatory. (offtop: so is it possible to encode audio files with mencoder? Couldn't find it in google.) 3. Due to both previous problems, oggenc says that the format is not supported. P.S. It's a pitty, that mencoder does not support -oac libvorbis or smth. Thanks in advance. _______________________________________________ MPlayer-users mailing list MPlayer-users@xxxxxxxxxxxx https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
