On 2022-07-01 03:33 pm, Anton Khirnov wrote:
Quoting Gyan Doshi (2022-06-25 10:29:51)
This is a per-file input option that adjusts an input's timestamps
with reference to another input, so that emitted packet timestamps
account for the difference between the start times of the two inputs.
Typical use case is to sync two or more live inputs such as from capture
devices. Both the target and reference input source timestamps should be
based on the same clock source.
If both streams are using the same clock, then why is any extra
synchronization needed?
Because ffmpeg.c normalizes timestamps by default. We can keep
timestamps using -copyts, but these inputs are usually preprocessed
using single-input filters which won't have access to the reference
inputs, or the merge filters like e.g. amix don't sync by timestamp.
What this option does is allow keeping 0-start timestamps but offset the
target input relatively. Then it's possible to filter/merge in sync.
Regards,
Gyan
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