CODEWITHSUNDEEP
ffmpeg
Lemon Sky
Lemon Sky

Reputation: 697

Ffmpeg seeking with m3u8 ineffective

Following the answer at Ffmpeg inaccurate cutting with ts and m3u8 files despite resamping audio filter, I am cutting some portion out of an m3u8 file.

My m3u8 has a segment every 4 seconds, so I seek to a location around 10 seconds before the cutting point with -ss before -i. Then adjust position with -ss after -i.

Here are two examples where the starting cut points are off by 1s:

ffmpeg -y -ss 0:03:22 -start_at_zero -i http://tyberis.com/CFTE-AM_2020-08-28_23-00-00.m3u8 -ss 1 -t 0:00:10 322.wav

ffmpeg -y -ss 0:03:23 -start_at_zero -i http://tyberis.com/CFTE-AM_2020-08-28_23-00-00.m3u8 -ss 1 -t 0:00:10 323.wav

When I compare the two output files, they are binary same:

diff 323.wav 322.wav -s
Files 323.wav and 322.wav are identical

What am I doing wrong? How can I accurately seek to the desired position?

Upvotes: 0

Views: 1222

Answers (1)

Stoney Eagle
Stoney Eagle

Reputation: 1132

You are setting the start position twice, you should set the start position before the input to make Ffmpeg start reading the input from there. Setting the seeking flag after the input makes it process the whole input.

ffmpeg -y -ss 0:03:23 -i http://tyberis.com/CFTE-AM_2020-08-28_23-00-00.m3u8 -t 0:00:10 323.wav

Upvotes: 1

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