[FFmpeg-devel] [PATCH] movenc: write clap tag
jamrial at gmail.com
Sat Jul 8 00:13:39 EEST 2017
On 7/7/2017 12:32 PM, Derek Buitenhuis wrote:
> On 7/7/2017 3:20 AM, Dave Rice wrote:
>> Resolves https://trac.ffmpeg.org/ticket/6145 and writes a clap atom that is coincident with the frames width and height.
>> From 23d80d0d47829fed61e817b1e7c3f6d420c9ab5c Mon Sep 17 00:00:00 2001
>> From: Dave Rice <dave at dericed.com>
>> Date: Thu, 6 Jul 2017 21:12:38 -0400
>> Subject: [PATCH] movenc: write clap tag
>> libavformat/movenc.c | 19 +++++++++++++++++++
>> 1 file changed, 19 insertions(+)
> Whoever pushes, add the ticket number into the commit message.
>> + avio_wb32(pb, 0); /* horizOff_N (= 0) */
>> + avio_wb32(pb, 1); /* horizOff_D (= 1) */
>> + avio_wb32(pb, 0); /* vertOff_N (= 0) */
>> + avio_wb32(pb, 1); /* vertOff_D (= 1) */
> Near as I can tell, these related the active image area? Is it useful to ever set
> this to anything but 0 (aka the whole image is active)? Was thinking of stuff like
> analogue video, a la http://chromashift.org/aspectratio/. I assume the answer is
> probably 'no'.
> Patch itself LGTM.
Isn't this necessary only for files with raw video? As is, this box
would be written on any mov file with a video stream.
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