Date: Sun, 04 Jun 2006 16:01:49 -0700 From: David Myers <myers@aedifice.net> To: freebsd-multimedia@freebsd.org Subject: 64-bit bug in faac? Message-ID: <4483665D.8050505@aedifice.net>
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I've been experimenting with transcoding MPEG-2 transport streams to MP4 files (mpeg-4 video, AAC audio), using ffmpeg and faac. But there appears to be a 64-bit bug in faac. When I run the ffmpeg process from an i386 machine, the generated file is clean, and a Mac Mini running QuickTime can play the file without problems. But when I do the exact same transcode from my amd64 server, the resulting audio is bad. I get a constant stream of FAAD: Failed to decode frame: Invalid number of channels when I try to play the file using mplayer. After some delay, the video portion will play (using any of my players: mplayer/i386, mplayer/amd64, and QuickTime), but not the audio. Note that 'mp4info' (from the mpeg4ip port) indicates that the audio track is there, and that it has two channels... Anybody else seen this? Any workarounds? This bug is only in faac; running faad (the decoder piece) on either i386 or amd64 with a known-good MP4 file works fine. Though I note that faad is at version 2.0 in the ports collection, while faac is still 1.24. For reference, this is the command I run (identically on both i386 and amd64): ffmpeg -i $mpgfile -f mp4 -vcodec mpeg4 -b $bitrate -hq -acodec aac -ab 128 $mp4file Many thanks. -David.
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