Play m4a files on Windows 7

Peter Bogdanoff bogdanoff at me.com
Sat Aug 13 16:26:03 EDT 2016


Thanks Panos! I didn’t see an announcement about callbacks…

So is that different duration in Windows a predictable proportional amount compared to the duration in OSX? Is this proportion always the same number? (Or will I have to find this out myself?)

My application is cross-platform with many sets of callbacks. If I can simply multiply a callback value by a constant to get a new value for Windows, that would be fine with me. I’m hoping the durations of files in Windows is really not “random”!

Peter

On Aug 13, 2016, at 1:06 PM, panagiotis merakos <merakosp at gmail.com> wrote:

> Hi all,
> 
> @Jacque:
> 
> I can successfully play .m4a audio files on Windows 7 using LC 8.1 dp3
> *after* installing the LAV filters suggested in the LC Forums:
> http://forums.livecode.com/viewtopic.php?f=18&t=27380
> Note that this is not officially suggested by LiveCode Ltd, it is just a
> working solution.
> 
> @Peter:
> 
> Player callbacks are supported in LC 8.1 dp2 onwards:
> https://github.com/livecode/livecode/pull/4140
> So you can try them in 8.1 dp3 which is more stable than dp2. Just one
> thing to note:
> The Windows DS player uses different timescale, so e.g the same video might
> have a 1200 duration on OSX and 15200 on Windows (the numbers are
> completely random). So when you set the callbacks do *not* use an absolute
> value for the time, but relative to the player duration.
> 
> Best,
> Panos
> --
> 
> On Sat, Aug 13, 2016 at 10:57 PM, J. Landman Gay <jacque at hyperactivesw.com>
> wrote:
> 
>> Yes, you're right. We're pretty much screwed then. All the universities
>> have demanded that QT be removed from all site computers and our app
>> depends on .m4a audio. There are too many audio files to convert to another
>> format, and the audio guy refuses to do it anyway due to the quality
>> degredation.
>> 
>> We tried installing a codec pack but that didn't work either. We're in
>> trouble.
>> 
>> 
>> On 8/13/2016 2:09 PM, Peter Bogdanoff wrote:
>> 
>>> I see that Ian Macphail says:
>>> "We decided to overhaul the Windows player object, replacing the existing
>>> Quicktime based implementation with one based on DirectShow, which is fully
>>> supported on all current Windows versions.”
>>> https://livecode.com/removing-quicktime-dependency-from-live
>>> codes-player-object/
>>> 
>>> And the Microsoft page describing DirectShow’s supported formats (a
>>> rather limited list)-- .m4a is not one of them:
>>> https://msdn.microsoft.com/en-us/library/ms787745(VS.85).aspx
>>> 
>>> I’m very interested in this subject, especially when LC gets callbacks
>>> working.
>>> 
>>> Peter Bogdanoff
>>> UCLA
>>> 
>>> 
>>> On Aug 13, 2016, at 11:51 AM, J. Landman Gay <jacque at hyperactivesw.com>
>>> wrote:
>>> 
>>> On 8/9/2016 4:58 PM, J. Landman Gay wrote:
>>>> 
>>>>> On 8/9/2016 4:26 PM, J. Landman Gay wrote:
>>>>> 
>>>>>> We need to play .m4a files on Windows 7 and up. Double-clicking one of
>>>>>> those files plays back successfully on a Win 7 machine. Loading a
>>>>>> player
>>>>>> control with the URL to the file in LC on the same machine does not (LC
>>>>>> 7.1.4).
>>>>>> 
>>>>>> Is this fixable? Is there something users can install to make it work?
>>>>>> Or do we need a more recent version of LC?
>>>>>> 
>>>>>> 
>>>>> Poking around, it looks like I have to build in LC 8.1. If that's
>>>>> correct, then it's risky, it isn't stable yet. Is there any other way?
>>>>> 
>>>>> 
>>>> I've done some tests on  both Windows 10 and Vista using LC 8.1 but m4a
>>>> files still do not play when setting the filename of a player. They do play
>>>> using WMP. This is becoming an urgent issue for my client and I need to get
>>>> it working quickly. Does anyone know what we need to install, or how to get
>>>> this working?
>>>> 
>>>> Is anyone else able to play .m4a files on Windows using the new player
>>>> object?
>>>> 
>>>> --
>>>> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
>>>> HyperActive Software           |     http://www.hyperactivesw.com
>>>> 
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>>> 
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>> 
>> --
>> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
>> HyperActive Software           |     http://www.hyperactivesw.com
>> 
>> 
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