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absolutelypb
Jul 8, 2012, 07:35 PM
Hello,

I recently downloaded some videos onto my MacBook Pro (running Lion) from an SD card. The videos would not play on my mac, but they played (with audio) on a PC, so I right clicked on the videos and encoded them so they would play. After that, they played, but there was no audio. I don't know anything about codecs, but I'm guessing I'm missing an audio one? If anyone could help me out it would be great! I also have the MediaInfo screenshot of one of the videos..


eneral / Container Stream #1
Total Video Streams for this File.................1
Video Codecs Used.................................AVC
File Format.......................................MPEG-4
Play Time.........................................28s 528ms
Total File Size...................................5.15 MiB
Total Stream BitRate..............................1 515 Kbps
Encoded with......................................Mac OS X v10.7.4 (CMA 891, CM 705.78, x86_64)
Video Stream #1
Codec (Human Name)................................AVC
Codec (FourCC)....................................avc1
Codec Profile.....................................Baseline@L3.0
Frame Width.......................................640 pixels
Frame Height......................................352 pixels
Frame Rate........................................29.970 fps
Total Frames......................................855
Display Aspect Ratio..............................16:9
Scan Type.........................................Progressive
Color Space.......................................YUV
Codec Settings (Summary)..........................1 Ref Frames
QF (like Gordian Knot)............................0.224
Codec Settings (CABAC)............................No
Codec Settings (Reference Frames).................1
Video Stream Length...............................28s 528ms
Video Stream BitRate..............................1 513 Kbps
Video Stream BitRate Mode.........................VBR
Bit Depth.........................................8 bits
Video Stream Size.................................5.14 MiB (100%)
Video Stream Title................................Core Media Video
Date of Original Encoding.........................UTC 2012-07-01 06:44:51
Color Primaries...................................BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M
Transfer Characteristics..........................BT.709-5, BT.1361
Matrix Coefficients...............................BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M



MichaelLAX
Jul 8, 2012, 08:00 PM
...so I right clicked on the videos and encoded them so they would play. After that, they played, but there was no audio. I don't know anything about codecs, but I'm guessing I'm missing an audio one? If anyone could help me out it would be great! I also have the MediaInfo screenshot of one of the videos..

You are definitely missing your audio files!

m4v is a container which in this case contains an MPEG-4 video file but no audio files.

Where are the original SD files from: your video cam?

You say they play video & audio on your PC, but when do you "right click" on them...; in the PC? and then you encode them; with what?

In any event go here and download Perian on your MacBookPro and the original files should play in QuickTime:

Perian v1.2.3 (http://perian.org/)

If not, google Handbrake and download that wonderful program and transcode the original files using the Regular-Normal default encoding set, so that they will play with in QuickTime audio on your MBP.

Or, google VideoLan Mac and download this player which should play your original files.