Termux•3w ago

problem with installing ffmpeg with --enable-libxcb in termux

hello, is there any way to enable libxcb when installing ffmpeg on termux? i can't seem to directly enable this when installing ffmpeg in termux (pkg i ffmpeg), so i resort to rebuilding it from the git repo. but for some reason Error: libxcb is requested, but not found even though checking on the installed packages, there is libxcb!!! so i am currently stuck, if anyone have any fixes or ways for this i would appreciate it. thanks!

48 Replies

qlufoOP•3w ago

There are some sources stating that --enable-libxcb set as true by default when installing ffmpeg even just plain make doesn't work

TomIO•3w ago

If you're trying to build ffmpeg on-device you're gonna have a bad time. It's a very complex package with a lot of compile time dependencies. Looks like we're not currently building ffmpeg with --enable-libxcb. We do have a libxb package, so let me make a pull request to enable it on our FFMPEG package. It looks like libxcb is only used by the x11grab input device type. Which seems to do a "direct" capture of the specified X11 display. Should probably work if enabled. I'll report back when the PR is open.

qlufoOP•3w ago

indeed i am using ffmpeg as a "direct" capture in an x11 desktop environment. some might suggest to just use the android's build-in recorder, but its far convenient to just record it directly (and how usually i don't have access to keyboard or mouse peripherals, so it will look janky). i have a prior script that records the x11 using ffmpeg on my proot, it works really great! but i since moved to use termux directly instead of proot, and using the provided recordmydesktop package available in termux doesn't seem to be as smooth as ffmpeg thanks for the help, and I'll be waiting for the new update/fix to this

TomIO•3w ago

The build script could use a little cleanup while I'm here... Give me like 15 minutes to do some build tests.

TomIO•3w ago

PR is up. https://github.com/termux/termux-packages/pull/22738

GitHub

Ffmpeg enable libxcb support. by TomJo2000 · Pull Request #22738 ...

This was requested by user qlufotera in Discord. https://discord.com/channels/641256914684084234/1324260321371885608/1324260321371885608 libxcb is used by the x11grab input device type, used to dir...

TomIO•3w ago

Yep that worked.

TomIO•3w ago

Haven't tested the actual input type. If you'd like to test the package before it is merged I have left instructions in the PR.

qlufoOP•3w ago

Awesome unfortunately as i test it... uhh...

TomIO•3w ago

What was the command you used for testing?

qlufoOP•3w ago

oh yeah. apologies, but i forgot ffmpeg also has pulseaudio option for capturing the audio

qlufoOP•3w ago

here you go

ffmpeg -video_size 1280x720 -framerate 20 -f xcbgrab -i :0.0 -f pulse -i default -vf scale=854:480 -c:v h264_v4l2m2m -preset ultrafast -pix_fmt yuv420p -c:a aac -b:a 128k -async 1 "$HOME/Videos/recording_$(date '+%Y-%m-%d_%H-%M-%S').mp4"

ffmpeg -video_size 1280x720 -framerate 20 -f xcbgrab -i :0.0 -f pulse -i default -vf scale=854:480 -c:v h264_v4l2m2m -preset ultrafast -pix_fmt yuv420p -c:a aac -b:a 128k -async 1 "$HOME/Videos/recording_$(date '+%Y-%m-%d_%H-%M-%S').mp4"

TomIO•3w ago

Please be aware that your local copy of the FFMPEG source repo is not going to reflect the flags we use for building the package. But yeah PulseAudio is also not currently enabled on our FFMPEG package, and would likely require additional patching to work properly. It's worth a try though. What does echo $DISPLAY return?

qlufoOP•3w ago

:1 still even switching it to target :1 doesn't seem to work

TomIO•3w ago

Same error?

qlufoOP•3w ago

spits out the same error...

TomIO•3w ago

Oh I think I see the problem. The input format is called x11grab not xcbgrab

qlufoOP•3w ago

oh yeah i got this script with the help of the internet and tweak it a bit (lol) i used this script on proot, yes it did work great and functional. after moving it to termux, i searched the problem related to that on the internet apparently x11grab is deprecated on newer ffmpeg versions

TomIO•3w ago

Not surprising.

qlufoOP•3w ago

is there anything yet that i might've missed?

TomIO•3w ago

-c:v h264_v4l2m2m doesn't seem to exist from what I can tell.

qlufoOP•3w ago

ahh perhaps i should change my script a bit

TomIO•3w ago

Using a video codec that exists wouldn't be a bad start. V4L2 would likely be a non-starter on Termux regardless as Android doesn't usually ship the Video for Linux v2 kernel module.

qlufoOP•3w ago

Alright used libx264 sadly... same error 😞

TomIO•3w ago

I'm no FFMPEG wizard unfortunately.

qlufoOP•3w ago

i understand but it still questions me how it's not recognized here...

TomIO•3w ago

Here's the example from the FFMPEG documentation.

ffmpeg -f x11grab -framerate 25 -video_size cif -i "$DISPLAY" out.mpg

ffmpeg -f x11grab -framerate 25 -video_size cif -i "$DISPLAY" out.mpg

Does that do anything?

qlufoOP•3w ago

Alright ill try Oof same error Unknown input format

TomIO•3w ago

What's ffmpeg -devices spit out?

qlufoOP•3w ago

ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
  built with Android (12470979, +pgo, +bolt, +lto, +mlgo, based on r522817c) clang version 18.0.3 (https://android.googlesource.com/toolchain/llvm-project d8003a456d14a3deb8054cdaa529ffbf02d9b262)
  configuration: --arch=aarch64 --as=aarch64-linux-android-clang --cc=aarch64-linux-android-clang --cxx=aarch64-linux-android-clang++ --nm=llvm-nm --ar=llvm-ar --ranlib=llvm-ranlib --pkg-config=/home/builder/.termux-build/_cache/android-r27c-api-24-v1/bin/pkg-config --strip=llvm-strip --cross-prefix=aarch64-linux-android- --disable-indevs --disable-outdevs --enable-indev=lavfi --disable-static --disable-symver --enable-cross-compile --enable-gnutls --enable-gpl --enable-version3 --enable-jni --enable-lcms2 --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libharfbuzz --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenmpt --enable-libopus --enable-librav1e --enable-librubberband --enable-libsoxr --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-mediacodec --enable-opencl --enable-shared --prefix=/data/data/com.termux/files/usr --target-os=android --extra-libs=-landroid-glob --disable-vulkan --enable-neon --disable-libfdk-aac
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.100 / 61. 19.100
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 ---
 D  lavfi           Libavfilter virtual input device

ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers
  built with Android (12470979, +pgo, +bolt, +lto, +mlgo, based on r522817c) clang version 18.0.3 (https://android.googlesource.com/toolchain/llvm-project d8003a456d14a3deb8054cdaa529ffbf02d9b262)
  configuration: --arch=aarch64 --as=aarch64-linux-android-clang --cc=aarch64-linux-android-clang --cxx=aarch64-linux-android-clang++ --nm=llvm-nm --ar=llvm-ar --ranlib=llvm-ranlib --pkg-config=/home/builder/.termux-build/_cache/android-r27c-api-24-v1/bin/pkg-config --strip=llvm-strip --cross-prefix=aarch64-linux-android- --disable-indevs --disable-outdevs --enable-indev=lavfi --disable-static --disable-symver --enable-cross-compile --enable-gnutls --enable-gpl --enable-version3 --enable-jni --enable-lcms2 --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libharfbuzz --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenmpt --enable-libopus --enable-librav1e --enable-librubberband --enable-libsoxr --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-mediacodec --enable-opencl --enable-shared --prefix=/data/data/com.termux/files/usr --target-os=android --extra-libs=-landroid-glob --disable-vulkan --enable-neon --disable-libfdk-aac
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.100 / 61. 19.100
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 ---
 D  lavfi           Libavfilter virtual input device

TomIO•3w ago

Did you have to cut off the rest or is that all?

qlufoOP•3w ago

Thats all

TomIO•3w ago

That's a whole lot of not much.

qlufoOP•3w ago

oh...

TomIO•3w ago

Here's what I get on my PC's version of FFMPEG.

# [...] compiler options omitted for brevity
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 ---
 DE alsa            ALSA audio output
 DE fbdev           Linux framebuffer
 D  iec61883        libiec61883 (new DV1394) A/V input device
 D  jack            JACK Audio Connection Kit
 D  kmsgrab         KMS screen capture
 D  lavfi           Libavfilter virtual input device
  E opengl          OpenGL output
 DE oss             OSS (Open Sound System) playback
 DE pulse           Pulse audio output
  E sdl,sdl2        SDL2 output device
 DE video4linux2,v4l2 Video4Linux2 output device
 D  x11grab         X11 screen capture, using XCB
  E xv              XV (XVideo) output device

# [...] compiler options omitted for brevity
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 ---
 DE alsa            ALSA audio output
 DE fbdev           Linux framebuffer
 D  iec61883        libiec61883 (new DV1394) A/V input device
 D  jack            JACK Audio Connection Kit
 D  kmsgrab         KMS screen capture
 D  lavfi           Libavfilter virtual input device
  E opengl          OpenGL output
 DE oss             OSS (Open Sound System) playback
 DE pulse           Pulse audio output
  E sdl,sdl2        SDL2 output device
 DE video4linux2,v4l2 Video4Linux2 output device
 D  x11grab         X11 screen capture, using XCB
  E xv              XV (XVideo) output device

qlufoOP•3w ago

Hmm so what can i do to resolve this?

TomIO•3w ago

I'm gonna guess nothing. This is gonna need further troubleshooting by the looks of it.

qlufoOP•3w ago

How about your own mobile device? (Termux) Since you explicitly said your PC one?

TomIO•3w ago

Only getting lavfi on my phone.

qlufoOP•3w ago

Huh so is it the package's problem?

TomIO•3w ago

I'm guessing it's an Android limitation. All of these except lavfi (which is a "virtual" input device) use system devices located in /dev. Which, we don't get access to on Android.

qlufoOP•3w ago

Bummer interesting how it works on proot though any reasons why? https://media.discordapp.net/attachments/414372897109573643/1324005868236181544/recording_2025-01-01_20-19-53.mp4?ex=6776940d&is=6775428d&hm=0b5b63f0a276fcc30b3440d4bafa7b08155596df3cd1de8e68087ff0c3d29181&

TomIO•3w ago

Proot fakes some devices and system calls.

qlufoOP•3w ago

Ah so it doesnt really get the system devices. Just makes one No wonder to get audio working you need to do it outside proot

TomIO•3w ago

It doesn't make one, it "fakes" one. e.g. it provides a shim -# https://en.wikipedia.org/wiki/Shim_(computing)

Shim (computing)

In computer programming, a shim is a library that transparently intercepts API calls and changes the arguments passed, handles the operation itself or redirects the operation elsewhere. Shims can be used to support an old API in a newer environment, or a new API in an older environment. Shims can also be used for running programs on different so...

qlufoOP•3w ago

Is it possible to "fake" some in termux/replicate what proot did to some devices?

TomIO•3w ago

I don't think so.

qlufoOP•3w ago

Are there any future solutions (based on the new comment on the PR), or this is it?

TomIO•3w ago

I'm not sure, and patching libavdevice would be out of my range of expertise.

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problem with installing ffmpeg with --enable-libxcb in termux

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