BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Video File Formats (MP4)          BorlandTalk.com Forum Index -> Delphi Multimedia View previous topic :: View next topic   Author Message Patrick Guest Posted: Wed Jan 17, 2007 6:09 am    Post subject: Video File Formats (MP4) Does anyone know the structure of *.mp4 files. I can't even find the basic things like FourCC, and framerate. I've only found dimensions. Didn't find any Audio information at all. Back to top Tsviatko Jongov Guest Posted: Wed Jan 17, 2007 9:12 am    Post subject: Re: Video File Formats (MP4) Hi, MP4 files are actually MPEG-4 in QuickTime container. You can try my free QuickTime Atom Viewer: http://tsviatko.jongov.com/index_prj_quicktimeviewer.htm QuickTime Atom Viewer application provides the user with a visual representation of the QuickTime container. QuickTime files can contain a wide variety of different video coded streams (MPEG-2, MPEG-4, H.264, Animation, DV, MJPEG), still graphic formats (TIFF, PICT, JPEG), and audio streams (WAV, AIFF, AAC). Regards, Tsviatko Jongov http://tsviatko.jongov.com "Patrick" <patrickveenstra (AT) yahoo (DOT) es> wrote: Quote: Does anyone know the structure of *.mp4 files. I can't even find the basic things like FourCC, and framerate. I've only found dimensions. Didn't find any Audio information at all. Back to top Patrick Guest Posted: Wed Jan 17, 2007 4:39 pm    Post subject: Re: Video File Formats (MP4) Thanks, I'll take a look. "Tsviatko Jongov" <johngov (AT) yahoo (DOT) com> escribió en el mensaje news:45add77c$1 (AT) newsgroups (DOT) borland.com... Quote: Hi, MP4 files are actually MPEG-4 in QuickTime container. You can try my free QuickTime Atom Viewer: http://tsviatko.jongov.com/index_prj_quicktimeviewer.htm QuickTime Atom Viewer application provides the user with a visual representation of the QuickTime container. QuickTime files can contain a wide variety of different video coded streams (MPEG-2, MPEG-4, H.264, Animation, DV, MJPEG), still graphic formats (TIFF, PICT, JPEG), and audio streams (WAV, AIFF, AAC). Regards, Tsviatko Jongov http://tsviatko.jongov.com "Patrick" <patrickveenstra (AT) yahoo (DOT) es> wrote: Does anyone know the structure of *.mp4 files. I can't even find the basic things like FourCC, and framerate. I've only found dimensions. Didn't find any Audio information at all. Back to top Patrick Guest Posted: Wed Jan 17, 2007 5:56 pm    Post subject: Re: Video File Formats (MP4) Thanks, it seems to show all I needed. Back to top Patrick Guest Posted: Wed Jan 17, 2007 7:35 pm    Post subject: Re: Video File Formats (MP4) I've found everything I need, except audio and video bitrate. I only know the total bitrate. The SampleSize block states the number of entries, but sample size = 0. Of course I thought about reading all sample sizes, and taking the average, but it seems to me that there must be a simpler way. Back to top Tsviatko Jongov Guest Posted: Wed Jan 17, 2007 9:11 pm    Post subject: Re: Video File Formats (MP4) Hi, In order to find the track(stream) bitrate you'll have to find the ("number of bits per stream" / "duration") = bits/sec. From your post I'll take that you know how to calculate the "duration" parameter. Each track is built from chunks. Each chunk may contain one or more samples. If the "Sample Size" in the "stsz" atom is equal to 0 then there must be a "Sample Size Table", which denotes the size of each sample. You'll have to sum all the sample sizes and you'll have your value in bytes. I think you'll manage from here. You can find more information in the "QuickTime File Format". I think you can find it free on the www.apple.com. Regards, Tsviatko Jongov http://tsviatko.jongov.com "Patrick" <patrickveenstra (AT) yahoo (DOT) es> wrote: Quote: I've found everything I need, except audio and video bitrate. I only know the total bitrate. The SampleSize block states the number of entries, but sample size = 0. Of course I thought about reading all sample sizes, and taking the average, but it seems to me that there must be a simpler way. Back to top Patrick Guest Posted: Wed Jan 17, 2007 11:38 pm    Post subject: Re: Video File Formats (MP4) So actually if the sample size = 0 then bitrate is variable and one has to calculate. For some reason Apple didn't consider it important to write the average like in every other file format. Thanks a lot for your great support. Back to top Whome Guest Posted: Sun Jan 21, 2007 9:11 am    Post subject: Re: Video File Formats (MP4) Patrick wrote: Quote: Does anyone know the structure of *.mp4 files. I can't even find the basic things like FourCC, and framerate. I've only found dimensions. Didn't find any Audio information at all. http://koti.mbnet.fi/akini/delphi/dspack/ file: VMRBitmap.zip Look at uMediaDetails.pas unit. It uses DSPACK directshow wrapper to utilize functionality. It should work for all directshow registered codecs. Back to top Patrick Guest Posted: Mon Jan 22, 2007 4:41 pm    Post subject: Re: Video File Formats (MP4) I didn't want to depend on codecs. But thanks anyways. "Whome" <nomail (AT) maildot (DOT) com> escribió en el mensaje news:45b3183f (AT) newsgroups (DOT) borland.com... Quote: Patrick wrote: Does anyone know the structure of *.mp4 files. I can't even find the basic things like FourCC, and framerate. I've only found dimensions. Didn't find any Audio information at all. http://koti.mbnet.fi/akini/delphi/dspack/ file: VMRBitmap.zip Look at uMediaDetails.pas unit. It uses DSPACK directshow wrapper to utilize functionality. It should work for all directshow registered codecs. 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