[FFmpeg-devel] [PATCH] Turn off usage of base_data_offset in tfhd for PIFF files

Michael Niedermayer michaelni at gmx.at
Thu May 16 22:24:39 CEST 2013

On Thu, May 16, 2013 at 06:57:47PM +0200, Jeremy Hinegardner wrote:
> Hi all
> I am generating ISMV files via ffmpeg, and the player we are using is quite
> strict according to the PIFF specification. 
> It appears that when ffmpeg is creating ISMV files it is setting the 
> `base_data_offset` flag which is contrary to what the PIFF specification[1] specifies. 
> Section 5.2.17 says "the base_data_offset field MUST be omitted".
> I managed to track this down and it appears the fix is just a single bit flag to 
> be blanked out. With this patch the players we have tested are now happy
> with the ismv files created by ffmpeg.
> thanks for you time,
> [1] http://www.iis.net/learn/media/smooth-streaming/protected-interoperable-file-format

the patch breaks
make fate-lavf-ismv

Please take a look at the generated file and if ok update the checksum
for fate-lavf-ismv with the patch that also changes movenc.c



Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I am the wisest man alive, for I know one thing, and that is that I know
nothing. -- Socrates
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