[FFmpeg-user] ffmpeg serving to Avisynth

[Paul B Mahol]

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
>> 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.

And others like avi also do not work?

>
>>
>> >
>> > 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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