[mythtv-users] Underwater audio
Gregorio Gervasio, Jr.
gtgj at pacbell.net
Fri Feb 29 09:18:43 UTC 2008
>>>>> Michael T Dean writes:
m> On 02/28/2008 07:10 PM, Curtis Stanford wrote:
>>> I think I have the same problem with 32kHz audio in NUV recordings
>>> (framegrabber). The patch in this ticket (reverts some rev 15893
>>> changes) seems to fix the problem for me:
>>>
>>> http://svn.mythtv.org/trac/ticket/4764
>> That totally fixed my problem. Thank you!
m> Would be /really/ nice is some of you could test the value that's being
m> changed by that patch and find the smallest value that works... Try
m> starting at 120000. See:
m> http://www.gossamer-threads.com/lists/mythtv/dev/319315#319315
Based on limited testing, it's "fragment_size" rather than
"buffer_time" that's affecting this specific "underwater" problem:
1. (rev 15893)
fragment_size = (audio_bits * audio_channels * audio_samplerate) / (8*30);
buffer_time = 100000;
-> BAD -- underwater effect
2. (pre 15893)
fragment_size = 6144;
buffer_time = 500000;
-> OKAY
3.
fragment_size = (audio_bits * audio_channels * audio_samplerate) / (8*30);
buffer_time = 120000;
-> BAD -- underwater effect
4.
fragment_size = (audio_bits * audio_channels * audio_samplerate) / (8*30);
buffer_time = 500000;
-> BAD -- underwater effect
5.
fragment_size = 6144;
buffer_time = 100000;
-> better -- sounds okay but audio is sometimes lost when skipping
around (need to exit and restart)
6.
fragment_size = 6144;
buffer_time = 120000;
-> OKAY
I will try out this last setting for a while.
--
Gregorio Gervasio, Jr.
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