Hi all,
I am new to audio and video decoder, hence would appreciate some help in the beginning. I have an mpg file which has both and audio and video stream encoded. I use libmpeg2 to decode the video and display it on the monitor. I also use libmad to play the audio. when i decode the mpg file i store audio part of the mpg file in a separate file (for ex: audio.ma2). After mpg file decoding is over, i run madplay with the following options.
madplay -v /root/audio.ma2
I see the following error message on the screen.
MPEG Audio Decoder 0.15.2 (beta) - Copyright © 2000-2004 Robert Leslie et al. error: frame 0: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 3: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 6: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 9: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 12: CRC check failed 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 14: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 17: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 20: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 23: CRC check failed 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 25: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 28: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 31: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 34: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 36: lost synchronization 00:00:01 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 39: lost synchronization 00:00:01 Layer II, 224 kbps, 44100 Hz, stereo, CRC
could anybody please tell me what could be the problem?
regards, -onup
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On May 9, 2004, at 7:15 PM, chikku belli wrote:
I am new to audio and video decoder, hence would appreciate some help in the beginning. I have an mpg file which has both and audio and video stream encoded. I use libmpeg2 to decode the video and display it on the monitor. I also use libmad to play the audio. when i decode the mpg file i store audio part of the mpg file in a separate file (for ex: audio.ma2). After mpg file decoding is over, i run madplay with the following options. madplay -v /root/audio.ma2 I see the following error message on the screen. MPEG Audio Decoder 0.15.2 (beta) - Copyright © 2000-2004 Robert Leslie et al. error: frame 0: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 3: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 6: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 9: lost synchronization 00:00:00 Layer II, 224 kbps, 44100 Hz, stereo, CRC error: frame 12: CRC check failed
[...]
could anybody please tell me what could be the problem?
It would seem the MPEG audio has not been properly demultiplexed from the combined audio/video stream. I would check for errors in the demultiplexing process.
Hope this helps.
-
chikku belli -
Rob Leslie