On 2021-02-26 21:28, Jim DeLaHunt wrote:
On 2021-02-26 17:53, Mark Filipak (ffmpeg) wrote:
… I'm concerned with the internal time base in the filter pipeline that's used to resolve frame
ordering, both video and audio.…
That is the timebase which FFmpeg stores as a rational number, and is an attribute of the video
stream, and can take various values.
Yes, it stores the time base as a rational number -- as an integer, actually. By default, it obtains
it from the decoder (which presumably obtains it from the video transport header).
As I read the code, it is stored in struct AVFilterLink, and is referred to as `link ->time_base`,
and has type `AVRational`.
…Currently, the ffmpeg internal time base appears to be 1kHz.…
Reading the code, and especially the type AVRational for the time_base value in AVFilterLink, points
away from this claim. The evidence you have presented so far does not prove this claim. The evidence
could be explained by your specific file input1.mkv having a varying frame rate, rounded to 1ms
increments.
Yes, AVRational is a value in the code -- I'm taking your word on that. That's not what I'm
'talking' about. What I'm 'talking' about is resolution of frame-to-frame, deltaPTS.
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