Just to bring up my question again. Is anyone could help on this? Thank
you.-Dennis
On Monday, April 24, 2017 12:41 AM, Dennis Huang
<[email protected]> wrote:
Hi all,
First of all, thanks for the great ffmpeg software. It is useful and neat.
Good job.
My question is regarding the long delay before ffmpeg transcodes a file, with
following command,
ffmpeg -i embed_sub.mkv -vf subtitles=embed_sub.mkv -sn result.mkv
With -loglevel trace, it shows the command takes over 30 seconds going through
ALL subtitles in mkv before it starts the transcoding. Yet this causes problem
for a real-time transcoding server like Universal Media server, which needs the
output stream within certain time, usually a few seconds. The long wait before
the transcoding causes the server to timeout.
When the delay is taking place, it stops with following messages,
[Parsed_subtitles_0 @ 0x1c8f6e0] Shaper: FriBidi 0.19.6 (SIMPLE) HarfBuzz-ng
1.4.5 (COMPLEX)
[Parsed_subtitles_0 @ 0x1c8f6e0] Using font provider fontconfig
I have 2 questions,
1. Why ffmpeg needs to go through all the subtitles before the transcoding?
And2. Is there any way ffmpeg could start the transcoding without the long
delay in this case?
The file, embed_sub.mkv includes following tracksTrack1 libx264 videoTrack2 dts
audioTrack3 ASS subtitles
Thank you for the time and information in advance.
-Dennis
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