[FFmpeg-user] Question regarding ffmpeg source code

Cihan Topal c.topal at surrey.ac.uk
Wed Sep 11 02:42:19 EEST 2019


Hi Carl,

Thank you for your quick reply.
I am using the source code to develop my own application.
There are command line examples to use with ffmpeg process involving parameters for crf and map options; but in the source codes I couldn't find these attributes in avformat or any other structure.

I have to stream three synched video streams with MPEG-TS and one of them has to be lossless.
I could stream two lossy videos successfully but I cant add the 3rd lossless one.
I am trying huffyuv and rawvideo codecs for the 3rd stream but it ain't working.

Thanks,
Cihan

________________________________
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> on behalf of Carl Eugen Hoyos <ceffmpeg at gmail.com>
Sent: Wednesday, September 11, 2019 12:16 AM
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] Question regarding ffmpeg source code

Am Mi., 11. Sept. 2019 um 01:12 Uhr schrieb Cihan Topal via
ffmpeg-user <ffmpeg-user at ffmpeg.org>:

> I am working on some project involving video streaming using ffmpeg library source codes.
> Although I searched the web, I could not find a proper answer for lossless encoding with H264.
>
> I have two questions:
> 1- Constant Rate Factor (crf), preset and map are some of the parameters available in the
> ffmpeg process. However, they are not to be found in the source code available?

I have to guess (you forgot to provide the command line you tested
together with the complete,
uncut console output) but my guess is that you are using x264 to
encode which is not part of
the FFmpeg source code but an independent project (that can be used
from within FFmpeg).

Carl Eugen
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