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Plosive Noise occurs then encoding audio and video together on DM6467

Hi, all. I'm integrating the new 1080BP encoder on DM6467, when encoding the AAC audio and h264 video together, a plosive noise occurs, which troubles me much. I've found that when encoding only the audio, no noise occurs and when audio video together, from the recorded receive PCM audio sequence, the addition of the new h264 1080BP encoder makes the received PCM plosive for audio with larger amplitude when the audio is plane flying, gun shoting, or bomb exploding.  But when combine the same AAC audio encoder and the older 720P h264 video encoder, nothing wrong, both the audio and video encoded are perfect. From the difference between the two h264 encoder, I only find the EDMA resources required for the new 1080BP encoder is much more than the older 720P encoder. So I checked the EDMA resourec allocation between the ARM and DSP subsystem. All the EDMA channels correspond to the McASP and SPI are managed by ARM, so the video encoding carried out by DSP shouldn't affect the receiving of the non-encoded PCM audio. So could anyone tell me what might influence the encoding process, especially the audio receiving?

Thanks a lot. 

  • Also a tricky problem is when encoding with the new h264 1080 video encoder, the received audio is left right channel mixed. That is when at one sample, the left channel data become the right channel and the right channel become left, and after tens or hundreds of samples, the left channel comes back. So the frequent commute of the sampled left and right channel cause the plosive noise. But how does the phenomena occur?