Hi! Am Fr, den 09.01.2004 schrieb Martin Emrich um 17:20:
[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html] Hi!
Am Mi, den 07.01.2004 schrieb Martin Emrich um 00:51:
Done. Hacked the AVI to 25fps. Sox will hopefully take care of the audio.
I made the audio (25/23.976) times faster (this went correct, as (audiolength_before/audiolength_after) == (25/23.976)) and muxed the audio file back into the hacked avi with "-oac copy -ovc copy -audiofile audio-25.wav". But all I get is terrible audio desync. That much for a PAL SVCD.
Today, I started all over again: Took the original AVI, recoded it to very-high-bitrate MPEG4 with PCM audio (Hacking the audio sample rate on the origial with MP3 audio didnt work), plays fine, with no visible quality loss. Then I hacked the header to an audio sample rate of 45983Hz (44100*(25/23.976)). (I hacked the videe frame time to 0.0400sec = 0x9c40, too, but mplayer didn't care, uses still 23.976fps; wonder where it gets this number from...). So I thought it should play fine now with "mplayer -fps 25". But I got the audio desync again. So I experimented with -fps, and found out that if I use -fps 27.40 (!), it plays almost correct (by watching lip sync at ca. 60sec playing time). I tried with and without -af resample=48000, to rule out issues with the sound card driver (SB Live+Alsa), and with and without "-ni". I wonder where this weird framerate of 27.4fps comes from. Ideas? Ciao Martin