[FFmpeg-user] Question about 2 pass encoding

[Aditya Dandavate]

Okay sir, I will follow your advice and your all instructions.

Thank you for guiding me.

On Tue, 2 Apr, 2024, 12:17 am Srikanth Kotagiri, <srikanthk at gmail.com>
wrote:

> On Mon, Apr 1, 2024 at 11:15 AM Aditya Dandavate
> <adityadandavate04 at gmail.com> wrote:
> >
> > okay.
> >
> > thank you sir.
> >
> > But, I had one more problem coming frequently while encoding in two-pass.
> > The problem says `File Ended Prematurely`.
> >
> > What could be the reason for this frequent issue ?
> >
> > On Mon, 1 Apr, 2024, 11:42 pm Laine Lee, <llee040 at sbcglobal.net> wrote:
> >
> > >
> > >
> > > > On Apr 1, 2024, at 9:35 AM, Aditya Dandavate <
> > > adityadandavate04 at gmail.com> wrote:
> > > >
> > > > But according to H.264 guide :
> > > >
> > > > Warning: When using option -an, you may eventually get a segfault or
> a
> > > > broken file. If so, remove option -an and replace by -vsync cfr to
> the
> > > > first pass.
> > > >
> > > > When I put `vsync cfr` then it says that `-vsync` is deprecated, use
> > > > `-fps_mode`
> > > >
> > > > What is all this happening ?
> > >
> > > I’ve found that using “-fps_mode cfr” appears to serve as an adequate
> > > replacement for the “vsync” call in recent versions of ffmpeg (to keep
> it
> > > from complaining).
> > >
> > > Sincerely,
> > > L. Lee
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> Thinking about it a little bit more, having the -an or removing the
> -an filter can change the computed duration of the file depending on
> audio track durations and any start_pts for the tracks. I think ffmpeg
> prioritized the audio track duration over the video track. I think I
> saw something recently? So I take my previous advice back and suggest
> using the audio codec consistently between the first and second pass
> commands. Also using -fps_mode cfr is the recommended way for newer
> ffmpeg versions.
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