[FFmpeg-user] why are my streams not aligned?

[gordon]

On Mon, Nov 18, 2019 at 1:08 PM Ted Park <kumowoon1025 at gmail.com> wrote:

>
> > I am not sure what you mean?  I thought I was doing a simple encoding:
> >
> > -  One input video only, one output for video.
> > - One audio input plus a finalized video input for the audio output.
> Yes, but you have separate (raw) input sources.
>
> I think by alignment you are referring to the segment durations varying
> from each variant to another which could be a simple fix (at least I think?)
> > Map is used to end up with a video only stream and an audio only stream.
> by using the variant map for the hls muxer.
>
> But then when you play the result, are the video and audio going to be in
> sync is what I’m wondering, since they come from separate sources, and
> processed on separate tasks.
>
> > I am only including the copied video because I was under the impression
> > that it was required to properly segment the audio file.
>
> The audio stream doesn’t even have to be ts, you could have separate aac
> files for each segment. If you mean properly wrt synchronization, that’s
> what I’m wondering, since you have separate audio and video sources, is
> that even going to make any difference?
>
> i.e. if you simply multiplex the input and output, are the video and audio
> in sync? If so, using that file and variant map would make things a lot
> simpler.
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Your questions made me check the source in more detail =)  I picked a
random test video from FFMPEG test cases to run through processing.  The
audio duration is longer than the video duration.  I think that is my issue
here, but I will report back if it turns out not to be the problem!