Changes between Version 9 and Version 10 of audio-problem-dropouts


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Timestamp:
Jan 24, 2007 2:28:41 AM (14 years ago)
Author:
bennylp
Comment:

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  • audio-problem-dropouts

    v9 v10  
    1919 1. [wiki:audio-check-packet-loss Check for network impairments of incoming RTP packets] 
    2020 1. [wiki:audio-check-cpu Check that CPU Utilization is not Too High] 
     21 1. Ticket #74 (incorporated in release 0.5.10) should fix the stutter problem on Windows Mobile, and probably on some other platforms as well. 
    2122 
    2223 
    23 == Windows Mobile Workaround == 
    24  
    25 Chen Huan observed stutters on Windows Mobile devices, and it turns out that this was caused by '''frame duration or {{{samples_per_frame}}} setting that is set too low when opening the sound device'''.  
    26  
    27 The usual settings for frame duration is 10ms or 20ms, which is good to provide low delay streaming. But it seems that Windows Mobile just can't handle this, and increasing the frame duration to 80ms seems to cure the problem. 
    28  
    29 Example: 
    30  
    31 {{{ 
    32  #define PTIME 20 
    33  
    34   int clock_rate = 8000; 
    35   int channel_count = 1; 
    36   int samples_per_frame = clock_rate * PTIME / 1000; 
    37   int bits_per_sample = 16; 
    38  
    39  
    40   status = pjmedia_conf_create( pool,         /* pool to use        */ 
    41                                 port_count,   /* number of ports    */ 
    42                                 clock_rate, 
    43                                 channel_count, 
    44                                 samples_per_frame, 
    45                                 bits_per_sample, 
    46                                 0,            /* options            */ 
    47                                 &conf         /* result             */ 
    48                                 ); 
    49 }}} 
    50  
    51 The snippet above will create a conference bridge '''with internal sound device''', using frame duration setting of 20ms (the PTIME macro). To fix the stutter problem, change PTIME to 80. 
    52