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After exporting with H.264, sound is not synchronized with video image in Premiere Pro
In exporting my sequence in Premiere Pro with H264 image codec and AAC sound codec, the final video has an offset in relation to the sound around 1 second in the entire movie, disorganizing it. Raw sound (footage used)) has normal stereo dialogues from several clips and a few mono sound effects. What’s wrong? What could I do to fix it? Thank you!
Format: H.264 Preset: YouTube Widescreen HD Export video, Export Audio Multiplexing: MP4 Stream compatibility: Standard Use maximum render quality TV standard: NTSC
Frame Rate: 23.976 (equal of the most part of the raw footage; others are Photoshop still images Profile: High Level: 3.2 Render at maximum depth Bitrate encoding: VBR, 2 pass
AUDIO FORMAT: AAC output channels: stereo (raw footage includes stereo sounds of movies and mono sound from special effects, in mono channels) Frequency: 44.1kHz Audio quality: High
Bitrate: 64 -
6 Replies
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That’s an odd problem, for sure. Can you test exporting a sample video with different media?
Kevin Monahan
Sr. Content and Community Lead
Adobe After Effects
Adobe Premiere Pro
Adobe Systems, Inc.
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I’ll try that. I keep thinking what could be happening, because I’ve already done this other times and this problem didn’t appeared. The only different thing in that is that there are mov clips (quicktime with lossless PNG) After Effects clips in Premiere timeline with the other “normal videos”.
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Might give it a go with uncompressed audio and see where you end up.
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Good guess; I’ll try it. Meanwhile, I’m getting closer to conclude that the problem may be arrising from software processing capabilities. The final rendered clip was quite complex in terms of pixels, colors and movement, it was rendered with the h.264 option “Profile:high”, which demands high processing power efficiency (not only from the hardware, but software also). Quicktime and Windows media player had that sound offset (less than a second), but VLC player didn’t, so as YouTube player, after the upload in which the sound had perfect coordination. A long and technical paper on h.264 described a similar situation. At last, it seems not to be a Premiere Pro issue. Thank you for the support!
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Sounds like you’ve found the upper bounds on your computer’s decoding abilities. Are you using CBR or VBR? On a VBR encode greater differences between the target/maximum bitrates means you need more decoding horsepower.
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Hi Jeff, I forgot to tell you, it was not only high profile, but VBR. But believe it or not, it was not a hardware limitation, because the problem occurs with this video only in Windows Media Player and QuickTime, but not with VLC player or after uploaded to YouTube. Thank you!
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