[RNLD] Problems with playback of Q4 video fles

[Mat Bettinson]

Stephen,

This: MPEG-4 AVC/ H.264 & AAC

While technically you can put video and audio streams of other codecs into
an MP4 container, doing so will give you files with reduced compatibility.
H264 also has a bewildering array of options which will also impact upon
playback compatibility. One way to try avoid problems like this is to use
an encoder or transcoding software and select a compatible 'profile'.
Handbrake, for example, has built-in profiles for Apple devices where such
profiles set resolution and encoder features to be compatible and visually
optimal on those devices. Those profiles tend to result in files that will
play on pretty much anything, and you can always slightly modify them such
as getting rid of a screen size constraint for mobile devices.

I would say that H264 + AAC is the defacto most supported (modern) file
type now, and also has excellent performance. Of course the actual quality
delivered very much depends on the bitrate you have chosen. Using the
'quality' setting (often expressed as a percentage) is probably a more
intuitive way to get to your desired size/quality trade off than using the
actual kbps bitrate settings.

P.S. If you want the genuine jack of all trades ultimate video and audio
conversion software, Mediacoder is great option. It also supports the
notion of profiles but also has a geekpocaclypse of settings if you need
more.


On 13 May 2014 12:18, Stephen Morey <S.Morey at latrobe.edu.au> wrote:

> Dear RNLD members,
>
> For those of you considering getting the Q4, I have discovered the
> following about it.
>
> I have been able to play the video files in real time, with both video and
> sound synchronically, by two methods:
>
> 1) The original .mov file can be played using a player called NewPlayer
> 2) I re-code the .mov file to .mp4 (using Xmedia Recode in my case) and
> play the .mp4 which then plays correctly in both KM Player and VLC Media
> Player.
>
> When recoding to .mp4, the new .mp4 files is around 1/10 the size. XMedia
> recode offers several different Video Codecs audio codecs and it also
> offers Audio/Video Synchronisation
>
> Can anyone advise which are best video codecs out of the following"
> MPEG-1
> MPEG-2
> MPEG-4
> MPEG-4 AVC/ H.264
> Motion JPEG
> XviD
>
> And the best audio codecs?
> AAC
> AC3
> MP2
> MP3
> Vorbis
>
>
> Stephen Morey
> Australian Research Council Future Fellow
> Centre for Research on Language Diversity
> La Trobe University
> Website:
> http://www.latrobe.edu.au/humanities/about/staff/profile?uname=SMorey
>
> ________________________________________
> From: Hiram Ring [hiram1 at e.ntu.edu.sg]
> Sent: 13 May 2014 00:23
> To: r-n-l-d at lists.unimelb.edu.au
> Subject: Re: [RNLD] Problems with playback of video files
>
> Stephen,
>
>   I did some searching and found a website which has a few interesting
> comments on the Q4 (see below). In light of them and your own, you might
> try accessing the storage card/device through windows explorer (assuming
> you're on a PC) and copying the MOV files from the camera directly to your
> hard drive and backing them up. Then use another piece of software (MPEG
> Streamclip, for example) to re-code the files from MOV to an MP4
> container/extension for editing and playback. Hopefully that will work
> better - try it with a short clip first, and if it doesn't work, experiment
> with a different format/extension.Hopefully the new files will be easier to
> play back and work with on your computer. Let me know if that helps.
>
> Best,
> Hiram
>
> > http://kmgoto.jp/public/Q4video.html <
> 1. Initial Status (Windows 7)
>         • ZOOM HandyShare does NOT work with Q4 video. The video freezes.
> It messes up video/audio synchronization if trimmed. (It still can be used
> for WAV audio only files.)
>         • QuickTime can play this video/audio format but video freezes or
> plays slow.
>         • Windows Media Player -- good video but no audio. It can play PCM
> 24bit audio in nature but only play 24bit wav file of specific header
> information. (It worked fine for PCM 24bit after K-lite codec pack was
> installed.)
>
> _______________
> Hiram Ring
> PhD Student, Grammatical Description and Documentation
> Nanyang Technological University
> http://linguistics.hss.ntu.edu.sg
>
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>
> Towards A Sustainable Earth: Print Only When Necessary
>
> On May 12, 2014, at 11:45 AM, Stephen Morey wrote:
>
> > Dear RNLD list,
> >
> > Last week I purchased a Zoom Q4 camcorder so that members of the
> community could use it in the field.
> >
> > The recorder creates .mov files.
> >
> > When playing back the test recordings, the video and audio do not play
> back in synchrony on either of KM Player or VLC media player. On KM player,
> the video plays back at about half the speed of the sound, on VLC the video
> didn't play at all, just a fixed frame and when I tried with Quick Time
> Player the whole computer froze for 10 minutes.
> >
> > So what is the best solution for being able to replay recordings
> properly?
> >
> > Stephen
> >
> > Stephen Morey
> > Australian Research Council Future Fellow
> > Centre for Research on Language Diversity
> > La Trobe University
> > Website:
> http://www.latrobe.edu.au/humanities/about/staff/profile?uname=SMorey
> >
> >
>
>


-- 
Regards,

Mat Bettinson
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