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20 Février 2021
Recently, I received a number of emails from folks with problems with audio that slowly drifts out of sync. These complaints cover Final Cut Pro X, Final Cut Pro 7, and Compressor.
Sync drift is generally caused by audio sample rates that don't properly match the audio settings in the sequence. Here's an article that explains this.
However, there are also problems with ProRes HQ and how it handles audio sync. Take a look at the two comments at the end of this article for more information:
MPEG Streamclip is a powerful video player, editor, and conversion tool for Mac and Windows. It's great at transcoding, but it's also a great organizational tool for all of your video and media. The DC30/DC30plus is now a real-time card, with scaled and windowed HD support, using the powerful RT Extreme Booster, the unique feature that, for the first time ever, extends the real-time power of Final Cut Pro HD to MJPEG and other formats, and works also in your PowerBook for offline editing. MPEG Streamclip (with or without the MPEG-2 Playback Component) can also convert MPEG-2 transport streams into muxed MPEG-2 files, for immediate burning at full quality with Toast 6 or 7 and Sizzle; it can also demux MPEG-1 and MPEG-2 files and transport streams with MPEG, AC3, PCM audio to M2V and AIFF (or M1A or AC3) files, for immediate.
But in the cases this week, the audio sync problem was caused by trying to edit an MP3 audio file. MP3 is extremely compressed and often difficult to edit. I strongly recommend converting (or transcoding) any MP3 files that you need to edit into AIF before you start editing. This won't improve the quality, but it will simplify your editing. And the good news is that this conversion process is very fast and can be automated.
NOTE: Soundtrack Pro just hates editing MP3 audio – transcoding (or conversion) is almost mandatory.
A general how to video covering MPEG Streamclip from Squared5. A free program used to convert digital video and audio files to desired format.
Here's how to convert your MP3, or any other audio format, to AIF using Compressor. (I'm using Compressor 4 for this example, but the process is the same using Compressor 3.x.)
1. Open Compressor.
2. Click Add File in the top left corner and import the MP3 file(s) you want to convert.
3. Click the Settings tab, twirl down the Apple folder, twirl down Audio Formats and look for the AIFF File setting.
4. Drag the AIFF File Winrar 32 bits full. setting on top of the task that contains your audio file in the top window.
5. Look in the Inspector and make SURE the sample rate is set to 48.000 kHz. This is the default setting for recording audio with video. If the sample rate is correct, go to Step 10. If it isn't, go to Step 6.
6. Click the Encoder button at the top of the Inspector.
7. If the automatic sensor button is dark, as it is here, click it to turn it off.
8. If the clip is mono, set the Channel layout to Mono. If it is Stereo, set Channel layout to Stereo.
9. Change the Sample rate popup menu to 48000.
10. In the task bar at the top, make sure the Destination (middle column) is set and you've given the compressed file a name (right column). Then, click Submit in the lower-right corner.
11. In the next dialog, click Submit and your file is sent off to be converted. Converting audio files is VERY fast, so even if you have a lot of MP3 files to convert, you won't be wasting a lot of time.
NOTE: Once you have a setting you like, turn it into a Compressor droplet which automates the entire audio transcoding workflow. This article explains how. www.larryjordan.com/technique-creating-a-compressor-droplet/
Bookmark the permalink.I. Supported iPhone Video Files
| iPhone Supported Video Formast | MOV, MP4, M4V |
| iPhone Unsupported Video Formats | AVI, FLV, MPG, MPEG, WMV, 3GP, VOB, MTS, MKV, 3G2, 3GPP, TS, TP, TRP, M2TS, DV, MOD, ASF, DAT, F4V, RM, RMVB, Divx, OGV, VRO, MXF. |
| iPhone Supported Video Encoders | H.264, MPEG-4 |
| iPhone Supported Technical Specifications | Audio: AAC-LC up to 160 Kbps, 48kHz, stereo Audio: AAC-LC up to 160 Kbps per channel, 48kHz, stereo |
The input video files supported for playback on your different iPhones such as iPhone 5S, 5C, 5, 4S, and 4 are as listed below:
II. Best Video Setting for Different Models of iPhone 5S, 5C, 5, 4S, and 4
The MP4 container with the H.264 video codec and AAC codec is the best video setting. Please find more details to the other settings as follow:
| Video Settings | Encoder: H264 |
| Audio Settings | Encoder: AAC |
If your video isn't iPhone supported or you're unsure of the best video setting for your iPhone (5S/5/4S/4 included), you can use a video converter to solve your problem. With the video converter below, you can simply select the preset output format for your device without having to adjust the video's setting manually.
| Version (as of 1/17/2015) | 1 |
| Platforms | |
| License | Freeware |
| Category | Video |
| More Info |
Rating: |
Main Features
Squared 5 MPEG Streamclip is a free video player with editing and converting capabilities. It is commonly used to download and convert video streams from the internet.
MPEG Streamclip is a fairly simple program that is straightforward to use. It can be used to play, edit, and convert video files with all of the tools accessible from the menu bar. The program also has the ability to perform batch operations.
If you are looking for a simple program to watch a video file, make simple edits to it, or convert it to a different format, MPEG Streamclip is a nice free option. For more advanced editing features you will probably want to use a different program like Windows Moviemaker or iMovie.
| Supported File Types | |
|---|---|
| .AC3 | Audio Codec 3 File |
| .AIFF | Audio Interchange File Format |
| .AVI | Audio Video Interleave File |
| .DAT | VCD Video File |
| .DV | Digital Video File |
| .M1A | MPEG-1 Audio File |
| .M1V | MPEG-1 Video File |
| .M2P | MPEG-2 Program Stream File |
| .M2T | HDV Video File |
| .M2V | MPEG-2 Video |
| .MMV | MicroMV Video File |
| .MOD | Camcorder Recorded Video File |
| .MOV | Apple QuickTime Movie |
| .MP2 | MPEG Layer II Compressed Audio File |
| .MP4 | MPEG-4 Video File |
| .MPA | MPEG-2 Audio File |
| .MPV | MPEG Elementary Stream Video File |
| .PS | PostScript File |
| .REC | Topfield PVR Recording |
| .TS | Video Transport Stream File |
| .VID | Generic Video File |
| .VOB | DVD Video Object File |
| .VRO | DVD Video Recording Format |
Updated: January 17, 2015
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