Changes between Initial Version and Version 1 of Ticket #692, comment 15


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Timestamp:
Sep 1, 2012, 4:24:24 AM (4 years ago)
Author:
ewhac
Comment:

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  • Ticket #692, comment 15

    initial v1  
    1515This second one specifies the video input on the command line first.  In the [http://ewhac.org/vid/badsync-va.mpg final file], the audio is slightly early relative to the video. 
    1616 
    17 All other arguments are identical.  I've attached the -report logs to this bug. 
     17All other arguments are identical.  I've attached the -report logs to this bug.  Use of -isync or -async arguments had no perceptible effect. 
    1818 
    1919Based on this behavior, I would guess that the input streams are not being synchronized/flushed before writing of the output file begins.  In other words, stale data is accumulating in the FIFO of one device while the next one is being opened.  In the case of a V4L2 device, this can take non-trivial time, allowing large amounts of audio data to accumulate.