Comments on: m4v file extensions http://blog.easelnet.net/2009/09/01/m4v-file-extensions/ Asterisk, ReduxEncoder, FilmRedux, IRC, ATV, iPhone and more... Wed, 16 Jun 2010 00:16:09 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Stefan http://blog.easelnet.net/2009/09/01/m4v-file-extensions/comment-page-1/#comment-468 Stefan Sat, 09 Jan 2010 04:39:23 +0000 http://blog.easelnet.net/?p=116#comment-468 Hello! The finder tells me a difference between .m4v and .mp4, even if you change the extension afterwards. mp4-Files are called MPEG-4-Movie and m4v-Files are called MPEG-4-Videofile (it should be so, if translated to english, in German it is "MPEG4-Film and MPEG-4-Videodatei). I.e. the file was originally a .mp4 file (MPEG-4-Movie) and you rename it to .m4v, it still remains to be a MPEG4-Movie and visa versa. So how should the finder know this, if only the extension differs? As I noticed this, I did not rename from .m4v to .mp4 anymore, but use Quicktime Pro to export to MPEG4 and select passthrough for Video and Audio. For the other direction, I do not know a "clean" way, but I am not really shure, if that could be needed. When going from m4v to mp4 over Quicktime, the extra data will be lost (I guess) - so better keep the m4v - or if I have an mp4, I don't think it needs any conversion to m4v. Hello!

The finder tells me a difference between .m4v and .mp4, even if you change the extension afterwards. mp4-Files are called MPEG-4-Movie and m4v-Files are called MPEG-4-Videofile (it should be so, if translated to english, in German it is “MPEG4-Film and MPEG-4-Videodatei).
I.e. the file was originally a .mp4 file (MPEG-4-Movie) and you rename it to .m4v, it still remains to be a MPEG4-Movie and visa versa. So how should the finder know this, if only the extension differs?
As I noticed this, I did not rename from .m4v to .mp4 anymore, but use Quicktime Pro to export to MPEG4 and select passthrough for Video and Audio.
For the other direction, I do not know a “clean” way, but I am not really shure, if that could be needed. When going from m4v to mp4 over Quicktime, the extra data will be lost (I guess) – so better keep the m4v – or if I have an mp4, I don’t think it needs any conversion to m4v.

]]> By: st373n http://blog.easelnet.net/2009/09/01/m4v-file-extensions/comment-page-1/#comment-370 st373n Sun, 01 Nov 2009 03:05:25 +0000 http://blog.easelnet.net/?p=116#comment-370 Hey Scott. Yep thats the case for any file you add to itunes regardless of its source, if the files are large it can seem to take itunes a long time. Hey Scott. Yep thats the case for any file you add to itunes regardless of its source, if the files are large it can seem to take itunes a long time.

]]> By: Scott Russell http://blog.easelnet.net/2009/09/01/m4v-file-extensions/comment-page-1/#comment-369 Scott Russell Sun, 01 Nov 2009 02:41:45 +0000 http://blog.easelnet.net/?p=116#comment-369 Love the app! I have noticed one issue that I was hoping you could explain. Whenever I add artwork (movie posters) to the m4v files created by ReduxEncoder, iTunes temporarily freezes while processing this addition. Ultimately, iTunes unfreezes & correctly assigns the artwork. Is there something about the encoding process that requires iTunes to re-code & thus cause this delay upon addition of artwork? Love the app! I have noticed one issue that I was hoping you could explain. Whenever I add artwork (movie posters) to the m4v files created by ReduxEncoder, iTunes temporarily freezes while processing this addition. Ultimately, iTunes unfreezes & correctly assigns the artwork.

Is there something about the encoding process that requires iTunes to re-code & thus cause this delay upon addition of artwork?

]]> By: st373n http://blog.easelnet.net/2009/09/01/m4v-file-extensions/comment-page-1/#comment-359 st373n Wed, 28 Oct 2009 01:21:47 +0000 http://blog.easelnet.net/?p=116#comment-359 Hey Chris, I'm not to sure how the Handbreak team are adding the 'atoms' to the .m4v files, they may be using a or may have written their own code, probably a better place to ask your question would be over at the handbreak forums. In ReduxEncoder the tools that add meta data and chapters are atomic parsley and mp4chaps. Also in order for Quicktime , iTunes AppleTV etc to see the chapters the files need to be m4v, perhaps its your renaming to mp4 thats causing something strange to happen. Hey Chris,
I’m not to sure how the Handbreak team are adding the ‘atoms’ to the .m4v files, they may be using a or may have written their own code, probably a better place to ask your question would be over at the handbreak forums.

In ReduxEncoder the tools that add meta data and chapters are atomic parsley and mp4chaps.

Also in order for Quicktime , iTunes AppleTV etc to see the chapters the files need to be m4v, perhaps its your renaming to mp4 thats causing something strange to happen.

]]> By: Chris http://blog.easelnet.net/2009/09/01/m4v-file-extensions/comment-page-1/#comment-354 Chris Mon, 26 Oct 2009 06:56:47 +0000 http://blog.easelnet.net/?p=116#comment-354 I've found some problems with this. Take a file encoded to be .m4v (with Handbrake), and rename it to be .mp4. Some files work, but others throw this error in Quicktime Player 7 (which Snow Leopard keeps if you already had QT Pro. The new Quicktime Player allows the file to work. "An invalid sample description was found in the movie." Is the problem with the file or is it with Quicktime Player 7 for handling something slightly unexpected--chapter info in a file named .mp4--poorly? I’ve found some problems with this. Take a file encoded to be .m4v (with Handbrake), and rename it to be .mp4. Some files work, but others throw this error in Quicktime Player 7 (which Snow Leopard keeps if you already had QT Pro. The new Quicktime Player allows the file to work.

“An invalid sample description was found in the movie.”

Is the problem with the file or is it with Quicktime Player 7 for handling something slightly unexpected–chapter info in a file named .mp4–poorly?

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