From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTPS id 091C54C8C4 for ; Sun, 9 Feb 2025 19:38:42 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 2B9A968BD13; Sun, 9 Feb 2025 21:38:38 +0200 (EET) Received: from mail-lj1-f182.google.com (mail-lj1-f182.google.com [209.85.208.182]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id BFE4068BC23 for ; Sun, 9 Feb 2025 21:38:31 +0200 (EET) Received: by mail-lj1-f182.google.com with SMTP id 38308e7fff4ca-307de92bce2so3138781fa.3 for ; Sun, 09 Feb 2025 11:38:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=proxyid.net; s=google; t=1739129911; x=1739734711; darn=ffmpeg.org; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=m0q9Cwx4s/3ElqFCuWDGnf117B2ENyX6HHCeT4tAyWw=; b=R8Jqn8d1L71XMSxCHmxBzzTH9HqTNwDDsE/HnqpNK4V2+/0hybWc7wDRUlLavGWLwO mNVF7CV4W2I2VHAU2q3JqVPgx7qiUJo9HiY15Jv3cXNalzegZF++wxYv4L09aYSSGRB4 tig/RFfiNs/w0DfYVMfnBagmNW1++fp/3g290QdDYkt4tYt9zGd2+fWiqhRbd0V4GT/h mlVWBrub6LfuGnd4iS01Q6NPW/OAB0/W4++xmq8UwnOAsJQvuXa/bNv7yDInnoA7p/9K uAc09OASqaFIq+3AakB4UeVVWokoRpkvb3ZUbrm59/jN9oG+xOjP9+ewETsFtlxkx/tO kWqg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739129911; x=1739734711; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=m0q9Cwx4s/3ElqFCuWDGnf117B2ENyX6HHCeT4tAyWw=; b=bz9uMchWkU5l9RYk+tQdG7UN5g4bplHhhNgEIZCXCZAz3Ih7dqhWI043c+K9B+/93c C3ee//rSICDUSceL/4v+tQVcYXxJ/azzELMlnWvYp4OcJnR1xh0HZmyhq7oNxAfPCSUQ rc+AiLp0oEWBWGGR8YncgZ/ZlD4+B1FR3vbvKPdJgRdrhaZpeaVlUJ7ZAaKc22ieATjL GlzSYc0zEeOXymoeIaoW/pg4Oa9C0dH+ewUBOfoT/p2B3luPBkeyZGQlf6VBiZ4M1EFk FxYNYGtZUqdlIXKABfRhdq+RqqXrkPcCcEo+ApvVsOvFWCV6RRrIOMrWcSOZaOb/gVb0 gDqw== X-Gm-Message-State: AOJu0YyQBVpS/+WtVywLHoaNh4vF7E1tniZ9rj0sI8+45dzzuqEmiMo7 0HBKNFmn8eOKmgqbM/U8jrB8xSwDFBd1XIQVxLzFNBeMYgo68LaGmJO5vZ4XCEkiprVQnVFZ88q rAQH+YRvnCH4/aRK/64l1K8sItgWMwyR4Px6PzrwsB7St8MuTVw0= X-Gm-Gg: ASbGncuBFQ0aboG0YQx1cStMj3CnHKjp2buhutY5S79L7gM+CUdjVNCpqNN0RVP0DdH /i6oJMLEpWpPipvjZ/SDJ7kmRBk/gKCOU4u2xsLv0VvjdepZI4CS2n+qhsHgthfip1MVWD9VO X-Google-Smtp-Source: AGHT+IEsZHOZlW0ZViesrYWB/vaZIsy+b5xHGVJFAu60lT6uqef/lsnCwYDmJpiunT0HtJaW4oWaTVzmJUd/YQbst84= X-Received: by 2002:a05:651c:1986:b0:302:27c6:fc7b with SMTP id 38308e7fff4ca-307e5a88206mr11468231fa.6.1739129910540; Sun, 09 Feb 2025 11:38:30 -0800 (PST) MIME-Version: 1.0 References: <96807479-FC34-4BBB-8421-6F242CDDBD4D@gmail.com> <0A2EA9D5-B1A3-4381-A4AF-D5C2E633B3C2@tvaughan.com> <0ACE2EA5-E685-4EBB-8068-260DBC502055@tvaughan.com> <7794F879-F6A2-4DDC-A9EC-BDED78189004@tvaughan.com> In-Reply-To: From: Marth64 Date: Sun, 9 Feb 2025 13:37:52 -0600 X-Gm-Features: AWEUYZlCkwQY2_j4vfTWKedS3_Bg5MkLhcS0qrtfpDVR0rFCEu1R84MExtI-XB0 Message-ID: To: FFmpeg development discussions and patches Subject: Re: [FFmpeg-devel] Captions SCC X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Partial reply: FFmpeg's CC decoder is actually pretty decent for pop-on CC but produces non-compliant ASS that needs postprocessing. ASS can cover and render the pop-ons quite well, but the fundamental limitation with representing EIA608 with ASS is that ASS does not allow arbitrary positioning AND justification at the same time, without making each line its own cue and carefully positioning the cues or applying some other complex workarounds. The only alternative I can think of within the ASS domain is to use heuristics to determine numpad positioning of the caption cue and declare justification tags without arbitrary positioning, but it needs work and will not be exact. This is a problem for say, I want to render a cue at position x,y but I want it also left justified at that position. I will share details and an example in my slides. I am personally not a fan of WebVTT but irrelevant to the advancements I'm hoping to make. I think baby steps have to come first. Have a good day, _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".