Thanks a lot for your answers and new questions.
When I run the -hwaccels, I get:
 ffmpeg -hwaccels
ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
  configuration: --enable-gpl --enable-version3 --disable-static
--enable-shared --enable-small --enable-avisynth --enable-chromaprint
--enable-frei0r --enable-gmp --enable-gnutls --enable-ladspa
--enable-libaom --enable-libass --enable-libcaca --enable-libcdio
--enable-libcodec2 --enable-libfontconfig --enable-libfreetype
--enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack
--enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg
--enable-librubberband --enable-librtmp --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
--enable-libtesseract --enable-libtheora --enable-libtwolame
--enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxvid --enable-libxml2 --enable-libzmq --enable-libzvbi
--enable-lv2 --enable-libmysofa --enable-openal --enable-opencl
--enable-opengl --enable-libdrm --enable-nonfree --enable-libfdk-aac
--enable-libbluray --extra-libs='-lnettle -lhogweed -lgmp'
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Hardware acceleration methods:
drm
opencl

So... That would mean that on this machine, with what configure has been
able to detect, I only have access to drm and opencl.

That's on a i5 laptop with an Intel 5500GPU

Information gathered from Chromium with the "about:gpu":
GPU0VENDOR = 0x8086 [Intel Open Source Technology Center], DEVICE=
0x1616 [Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) ] *ACTIVE*

> We (developers) apparently think that just as you have to know your
> input file to use ffmpeg (not every command line supports every
> input file), you also have to know the hardware you are using...
Great. That was not crystal clear for me up to now.
My first (reasonable) option would be to study the various systems I use,
try to understand which hardware accelerators they have if any, and then
choose the correct options in configure so that I will have a bespoke
ffmpeg. I have already tried that path (more or less) with ARM SoCs, and my
wounds have not healed yet.
The second (harebrained) option would be to turn every hardware accelerator
related option on with configure on every machine, so that I have a
consistent ffmpeg build script, and then try to understand for each
machine/build the hardware accelerators we have access to, if any (that
would be once more a pain in the neck with ARM SoCs).

Thanks.


On Fri, Sep 27, 2019 at 10:17 AM Moritz Barsnick <barsn...@gmx.net> wrote:

> On Fri, Sep 27, 2019 at 09:14:07 +0200, Michael Koch wrote:
> > Does that mean
> > a) List all hardware acceleration methods supported in this build of
> > ffmpeg, regardless if the hardware is really built into this computer,
> > or does it mean
> > b) List all hardware acceleration methods supported in this build of
> > ffmpeg and this hardware is really available in this computer?
>
> a)
> Which is not what the original poster requested.
>
> On the other hand, the command line needs to be adapted anyway,
> depending on hwaccel. Perhaps one could use ffmpeg to query by doing
> trial and error (e.g. encoding to /dev/null) - unfortunately, ffmpeg
> won't say what the actual issue was, unless you want to parse log
> messages.
>
> Moritz
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-- 
Bruno Verachten
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