[FFmpeg-devel] [PATCH v4 0/4] add ARIB caption decoder using libaribcaption

[TADANO Tokumei]

On 2022/06/16 22:40, Soft Works wrote:
> 
> 
>> -----Original Message-----
>> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of
>> TADANO Tokumei
>> Sent: Thursday, June 16, 2022 3:23 PM
>> To: ffmpeg-devel at 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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