<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>I'm topposting because its my own.... i cant wait months for solutions, so because nobody had some crisp thoughts on that or even solutions.... </div>
<div>So this is considered as a "push".... </div>
<div> </div>
<div>it didnt work with ffmpeg 2.x, like i thought... i guess i have to calculate pts/dts differently. i feel like the defaults in all the example arent enough.</div>
<div>maybe i will start to figure out how quicktime decodes or plays the video... how it reads the pts/dts, if it reads them..</div>
<div> </div>
<div>im clueless... but i dont want to discard all or using another framework.</div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Freitag, 20. Juni 2014 um 14:00 Uhr<br/>
<b>Von:</b> "Marco Sieber" <l-spy@web.de><br/>
<b>An:</b> libav-user@ffmpeg.org<br/>
<b>Betreff:</b> [Libav-user] strange H264 audio sync behavior</div>
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<div>Hello,</div>
<div> </div>
<div>i hope this works with the mailing lists and people can read it.</div>
<div> </div>
<div>I will descripe what im facing:</div>
<div> </div>
<div>I wrote a Transcoder it works fine so far, in generell its X Container/Format to MP4/H264.</div>
<div>We have a 20min File (5GB) its a QuickTime Movie (DNxHD36) the MP4 Output works fine with VLC (no sync issue).</div>
<div>But if i open it with Quicktime Player (v 10.x) i get a async audio after 5min, if i using the Scrubbing Bar from the Player it resync and after 5min playtime it gets out of sync again.</div>
<div> </div>
<div>Do i need to set some Flag for Quicktime Player? Or are there some known issues with Quicktime Players? VLC uses the libavcodecs too, is this the reason why it works with vlc and not with quicktime?</div>
<div>Im currently use the ffmpeg 1.2.4 libs should i test it with 2.x ffmpeg?</div>
<div> </div>
<div>---</div>
<div> </div>
<div>I noticed something with ffmpeg -i:</div>
<div>bevor transcoding:</div>
<div>Duration: 00:20:23.84, start: 0.000000, bitrate: 39219 kb/s</div>
<div>after transcoding:</div>
<div>Duration: 00:20:23.86, start: 0.021333, bitrate: 1109 kb/s</div>
<div> </div>
<div>why is the duration 0.02 longer? (of course because of starttime) i didn't set a specific starttime, is it something that the decoder/encoder does by himself?</div>
<div> </div>
<div>Thank you for reading hope you know something about this.</div>
<div>And im rly want to know if it works with this mailing list.</div>
<div> </div>
<div>Sincerely,</div>
<div> </div>
<div>Marco</div>
<div> </div>
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