[FFmpeg-user] ffmpeg serving to Avisynth

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of
> Paul B Mahol
> Sent: 15 September 2015 12:46
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] ffmpeg serving to Avisynth
> 
> On 9/15/15, Francois Visagie <francois.visagie at gmail.com> wrote:
> >> -----Original Message-----
> >> From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf
> >> Of Frank Tetzel
> >> Sent: 14 September 2015 21:40
> >> To: ffmpeg-user at ffmpeg.org
> >> Subject: Re: [FFmpeg-user] ffmpeg serving to Avisynth
> >>
> >> > > What processing do you want to do with ffmpeg?
> >> >
> >> > At a minimum I foresee concatenating input files with it. My
> >> > current project has 350+ video files. Avisynth cannot work with
> >> > more than 25
> >> > - 35 without crashing. I have not found an Avisynth mechanism for
> >> > concatenating files that preserves audio.
> >>
> >> There are multiple ways to concatenate files depending on the input
> >> codecs and what other processing you want to do with it [4]. Not sure
> >> if it handles hundreds of input files well enough.
> >>
> >> > > And why do you want to
> >> > > send it over tcp, if that's what TCPSource reads (not an avisynth
> >> > > user)?
> >> >
> >> > To avoid intermediate storage. Workspace for this project is 2TB.
> >> > Each additional version of the project is currently ~700GB. Some
> >> > form of inter-process communication is required to avoid
> >> > intermediate storage. TCPSource() seems the only type of built-in
> >> > IPC input Avisynth supports.
> >>
> >> I don't know which data layout they expect in TCPSource and if it is
> >> in any way compatible with the tcp output protocol in ffmpeg, or any
> >> other protocol. I know this was your question in the first place but
> >> i can't help you there. You could play around and just try to connect
> >> [1][2].
> >
> > On the premise that Avisynth would expect similar input via
> > TCPSource() than it produces via frame-serving, I noted its video and
> > audio formats when serving to ffmpeg and specified those codecs for
> > the most likely-looking protocol, tcp.
> >
> > Then came the issue of which format to specify for the tcp protocol.
> > ffmpeg reports Avisynth's input format as 'avisynth', which the former
> > does not support as an output format. I tried a couple of
> > likely-looking candidates, mostly the 'raw' ones. With some, e.g. 'rawvideo':
> >
> >     ffmpeg -y -i 00000.MTS -c:v rawvideo -c:a pcm_s16le -f rawvideo
> > tcp://127.0.0.1:22050?listen
> 
> How is rawvideo format supposed to handle audio frames?

Not, granted. Although rawvideo was simply the one picked (not very cleverly) for the example.

> 
> >
> > ffmpeg and Avisynth would connect and ffmpeg would in fact start serving.
> > After a short while, however, Avisynth would crash out and ffmpeg
> > would terminate with
> >
> >     av_interleaved_write_frame(): Unknown error
> >
> > This seems to indicate at least format incompatibility, and perhaps
> > initial connection set-up also.
> >
> >>
> >> There's also some avisynth support in ffmpeg [3]. As i never used it
> >> i don't know about its capabilities.
> >>
> >> What are you doing after processing with avisynth? Do you pipe it
> >> back into ffmpeg for encoding? Can't you use built-in filters [5]
> >> instead of an avisynth script?
> >>
> >>
> >> [1] http://avisynth.nl/index.php/TCPServer
> >> [2] http://ffmpeg.org/ffmpeg-protocols.html#tcp
> >> [3]
> >> http://www.ffmpeg.org/faq.html#How-can-I-read-DirectShow-files_003f
> >> [4] http://trac.ffmpeg.org/wiki/Concatenate
> >> [5] http://ffmpeg.org/ffmpeg-filters.html#Description
> >> _______________________________________________
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> >> ffmpeg-user at ffmpeg.org
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> >
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