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Sound siphon in quicktime6/6/2023 In addition, the downloaded 720p30 resolution H.264/AAC MP4 version of the same content also played correctly in the QT 7 player without conversion or additional third-party codecs. In short, based on the information provided, I cannot duplicate your problems. I then used QT 7 Pro (with Perian codec package installed) to directly convert the H.263/MP3 FLV compressed data to an H.264/AAC MP4 file having the same target settings as the original FLV file. However, when I downloaded the 426x240 version of the YouTube source file, it turned out to be a standard H.263/MP3 FLV file with stats quite different than those of your H.264/AAC MP4 download posted above and which did not display any AV sync issues. Basically, such sync problems normally devolve from a problem in the source file or in the processes used to download and/or convert the content.Ī YouTube search for the file name referenced in your initial comments directed me to this YouTube page which I used as a source file: I did attempt to duplicate the download/conversion process using my own system, software, and workflows but since you did not include any particular YouTube source file (i.e., URL) reference and my results were different than yours, I can't even be sure I started with the same content as you. You didn't really ask a question to which readers could respond nor do you seem to be looking for a workaround for your unexplained and rather circuitous workflow. ScreenShots of Inspector Pallete of respective moviesĮxported Original *notice Data Size & bitrate increases* Resulting movies (examples) - All video plays smooth 15fps, 426x240pix, no-change in bitrate.MPEG 4, millions, AAC, 44.100kHz stereo.H.264, millions, ?audio?Encoder, 44.100kHz stereo.The reason for all these movies (both behaving & misbehaving) being processed as follows is a subject for a whole different thread which will be started, if a solution (if any) doesn’t solve it too. In a 4 minute movie, the A/V OoS will get to be 10+ seconds if one does not try (B) – stop/start.ĪND when one does stop/start the movie, A/V does NOT sync back up!Īll movies have the same origin. *With Export, the A/V gets progressively more out-of-sync over time, BUT does not experience Audio stop ((Aa) from above - this is new observation since couldnt tell after audio stopped ). With the exception of Export, all the other movies behave exactly the same as the original. *(see below) Used “Export” with the same ‘Expert’ settings as the original movie Used “Save As” creating a new version of the file. Not being a novice troubleshooter, I have taken steps to solve the problem. Repeatablity… All movies that exhibit the A/V out-of-syncedness, do the same thing. Then, after ±50 more seconds, audio stops playing. (B) IF, one pauses/stops playback, then resumes playback, the A/V syncs back up (briefly, before repeating (A) & (Aa)) – with the Audio “playhead” jumping to sync with Video playhead position.įor example, if Audio has played the phrase “Say no more”, and one stops playback, then plays again, synced A/V will play “Say no more” in sync with lips on Video that appeared to be lagging behind. (Aa)Specifically, the audio gets ahead of video (or video lags behind?)Īfter ±50 seconds, the audio stops playing and, if left alone, never resumes playing until the end of the movie. (A) As playback progresses, The A/V gets progressively more out-of-sync. On only SOME movies, the A/V gets out-of-sync. Desktop Application - QuickTime Player Pro QuickTime™ Version 7.6.4 (1327.73)
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