On Sat, 3 Aug 2019, Tellow Krinkle wrote:

Fixes #6390

Sample file for new test: 
https://gist.githubusercontent.com/tellowkrinkle/d6a6e328f892dbbacc000ad9c3890644/raw/4f68e56b1f0fab594aae040723722af4f5161a02/longline.ass

Signed-off-by: Tellow Krinkle <tellowkrin...@gmail.com>
---
libavformat/assenc.c     | 4 +++-
tests/fate/subtitles.mak | 4 ++++
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavformat/assenc.c b/libavformat/assenc.c
index d50f18feb1..9b44b16597 100644
--- a/libavformat/assenc.c
+++ b/libavformat/assenc.c
@@ -95,7 +95,9 @@ static void purge_dialogues(AVFormatContext *s, int force)
                   ass->expected_readorder, dialogue->readorder);
            ass->expected_readorder = dialogue->readorder;
        }
-        avio_printf(s->pb, "Dialogue: %s\r\n", dialogue->line);
+        avio_write(s->pb, "Dialogue: ", 10);
+        avio_write(s->pb, dialogue->line, strlen(dialogue->line));
+        avio_write(s->pb, "\r\n", 2);

IMHO avio_printf should be fixed instead to use an AVBPrint buffer, this should remove the 4k limit from it.

Regards,
Marton
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