On 2022/06/16 22:40, Soft Works wrote:
-----Original Message-----
From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of
TADANO Tokumei
Sent: Thursday, June 16, 2022 3:23 PM
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH v4 0/4] add ARIB caption decoder
using libaribcaption
ping again!
Are there any objections to this patch set?
If not, would someone push it to the repository?
On 2022/06/08 18:48, TADANO Tokumei wrote:
ping
The patch set has been well tested by Japanese ISDB-related
developers and works fine.
I think it already has good quality to merge.
It requires external library like libaribb24, but the feature is
disabled by default.
There is no impact to current code without `--enable-
libaribcaption` option is
specified at configuration. The patch set provide better subtitle
feature
for ISDB users than libaribb24 if enabled.
What exactly is better than with the other ARIB decoder?
On 2022/05/30 23:55, TADANO Tokumei wrote:
This patch set add another ARIB caption decoder using
libaribcaption
external library: https://github.com/xqq/libaribcaption
The library decodes subtitles of ISDB-based TV broadcasting.
It is not only for Japanese ARIB STD-B24 caption, but also for
Brazilian ABNT NBR 15606-1 and Philippines version of ISDB-T.
Unlike libaribb24, it supports 3 types of subtitle outputs:
* text: plain text
* ass: ASS formatted text
* bitmap: bitmap image
This will become obsolete with the introduction of subtitle
filtering (https://github.com/ffstaging/FFmpeg/pull/18).
Just recently, Traian has joined and contributed a filter
for converting text subtitles to graphic subtitles
(https://github.com/softworkz/FFmpeg/pull/1), which fills
the last remaining gap for subtitle conversions.
Is this the only advantage over the existing ARIB caption decoder?
The existing ARIB caption decoder (libaribb24) has lower reproducibility.
For example, it lacks position information that is in original ARIB caption
data.
With this patch set, the intended caption is almost reproduced as ARIB standard
states.
Thanks,
TADANO
Thanks,
sw
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