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AVCHD vs MPEG-4

1379 Views 10 Replies Latest reply: Dec 9, 2012 3:36 PM by Ron73 RSS
Ron73 Level 1 Level 1 (5 points)
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Dec 7, 2012 6:20 PM

I see that iMovie 11 (O/S 10.8.2) natively supports AVCHD. I've a Canon M50 Camcorder as a recent purchase and I am a bit confused between shooting in AVCHD verses MPEG-4.

 

Any clarificaton would be greatly appreciated.

 

Thank you,

 

Ron

iMovie '11, OS X Mountain Lion (10.8.2), CANON VIXIA M50
  • AppleMan1958 Level 7 Level 7 (27,335 points)
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    Dec 7, 2012 6:36 PM (in response to Ron73)

    Chances are you will get the best quality shooting AVCHD.

     

    heck your manual for the data rates to be sure. The higher the data rate, the higher the quality.

  • panoramaBobl, Bob Thompson2 Calculating status...
    Currently Being Moderated
    Dec 7, 2012 8:55 PM (in response to Ron73)

    Also check the number of frames per second.  imovie works with 30fps.  I do not think it will accept 60fps.

     

    Bob

  • Karsten Schlüter Level 7 Level 7 (29,465 points)
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    Dec 7, 2012 11:23 PM (in response to Ron73)

    Ron73 wrote:

    ....any insight into that?

    2 interlaced fields = 1 frame

     

    manufacturers often confuse in their 'papers':

    30fps could refer to 60i or 30p

     

    --------------

     

    mpeg4 is an intra-frame encoder - each frame is compressed independently of the others; should allow an 'easier' processing than inter-frame compressors such as AVCHD.

     

    but intra-frame compression results theoretically in bigger (but 'better') files; therefor, in consumer cams, bit-rate is lowered = less quality. plus, a modern Mac handles AVCHD, because it converts into an intermediate, for editing optimized codec.

     

    summary:

    no advantages using mpeg4.

     

  • panoramaBobl, Bob Thompson2 Level 1 Level 1 (90 points)
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    Dec 7, 2012 11:24 PM (in response to Ron73)

    I do not know.  Maybe someone else can give the answer.  How does imovie handle it?

     

    Bob

  • AppleMan1958 Level 7 Level 7 (27,335 points)
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    Dec 8, 2012 8:06 AM (in response to Ron73)

    A look on the Canon website reveals the answer. Use AVCHD for highest quality. Use MP4 if you need something quick and dirty to put on YouTube or Facebook with no conversion and no editing. The highest quality will be AVCHD at 24Mbps.

     

    The VIXIA HF M50 camcorder gives you the flexibility of dual codec recording, allowing you to record in AVCHD or MP4 format, so you can pick the format that best suits your needs. AVCHD's higher bit-rate and finer resolution will yield the highest quality video for viewing on an HDTV or archiving to Blu-ray™. And for use with today's most typical video applications, the camcorder lets you record in MP4 format, too. MP4 format produces files you can share right away - with no need for conversion. Video is immediately available to upload to social networking sites like Facebook™ or YouTube™, view on an iPhone™, iPad™ or iPod Touch™.

     

    LP (5Mbps):
    3 hours

    SP (7Mbps):
    2 hours 20 minutes

    XP+ (12Mbps):
    1 hour 25 minutes

    FXP (17Mbps) - Allows 1920 x 1080 recording:
    1 hour

    MXP (24Mbps) - Allows 1920 x 1080 recording:
    40 minutes


  • Karsten Schlüter Level 7 Level 7 (29,465 points)
    Currently Being Moderated
    Dec 8, 2012 8:59 AM (in response to Ron73)

    Ron73 wrote:

    … AVCHD is fine for this? …

    sure AVCHD is.

    it has 4x the resolution of any DVD.

     

    but 90% of home-movies are out of 'quality' discussion …

    (tripod? low light? contrasts? correct shutter speed? … )

     

    ----------

     

    a "I don't know!" answered your question - funny!

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