[FFmpeg-user] Audio sync issues when transcoding Hauppauge HDPVR content

[Scott Naef]

On 1/16/2013 3:11 AM, Henk D. Schoneveld wrote:
> On Jan 15, 2013, at 10:20 PM, Scott Naef <snaef1 at mail.brookdalecc.edu> wrote:
>
>> Carl,
>>
>> Thank you for the help.  My sample source file input.mpg is at:
>> https://drive.google.com/uc?id=0BzSQuUjfkFN1a191MG9acnFPc3M&export=download
>>
>> My resulting output.mp4 is at:
>> https://drive.google.com/?tab=oo&authuser=0#folders/0BzSQuUjfkFN1OWIyNEQyRndmWG8
>>
>> My ffmpeg command is:
>> ffmpeg  -i input.mpg -async 1 -y -vcodec libx264 -r 25 -b:v 1268k -s 512x368 -acodec libmp3lame -threads 2 output.mp4
> Your source is 29.97 fps and your command line has -r 25 in it ??
>> Ouput log:
>> https://docs.google.com/file/d/0BzSQuUjfkFN1N0VsLXVud2tsV0E/edit
>>
>>
>> Tracy,
>>
>> I tried your -vsync 1 option but it did not work wither.  I also tried -vsync 0 and interestingly this option produced a slew of PTS / DTS conflict errors ( log is at: https://docs.google.com/file/d/0BzSQuUjfkFN1U1FaME43RjdBYTQ/edit ) but that did not work either.
>>
>> -Scott
>>
>>
>>
>>
>>
>> On 1/15/2013 2:35 PM, Carl Eugen Hoyos wrote:
>>> Scott Naef <snaef1 <at> mail.brookdalecc.edu> writes:
>>>
>>>> I have tried several options in FFMPEG such as
>>>> -async 1 but nothing I try seems to work.  I always
>>>> end up with about 1.5 second delay in video from audio.
>>> Please provide a sample that is long enough to
>>> easily (!) see the desync.
>>>
>>> And please provide the command line you tested
>>> for transcoding (ideally for the sample you
>>> provide) together with complete, uncut console
>>> output.
>>>
>>> Carl Eugen
>>>
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The -r 25 option might be left over from other testing.  I tried quite a 
few permutation of options and nothing seemed to work.  I tried very 
complex options like using -map on audio and video separately to very 
straight forward input output with almost no options.  Nothing seemed to 
work.

Based on the ticket  #2143 opened by Carl I downgraded to version 0.8.4 
of FFMPEG and the audio/video sync is working properly using the  -async 
1 option.

-Scott