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I am currently working on an embedded Linux system (kernel-5.10.24) that includes an LCD and a speaker.

At the moment, I am testing the playback of media files using ffmpeg and ffplay, without utilizing SDL. Initially, I attempted the following approach and encountered an error.

# ffplay /test.mp4 ffplay version 4.2.2 Copyright (c) 2003-2019 the FFmpeg testers built with gcc 7.2.0 (GNU Linux-Release5.0.0.0-Default(ARMv5)) configuration: --enable-cross-compile --cross-prefix=/test/armv5/gitdir/linux_gnu_armv5/out/product/fooarmv5.tea5.10-eng/obj/bin/arm-linux-gnu- --sysroot=/test/armv5/gitdir/linux_gnu_armv5/out/product/fooarmv5.tea5.10-eng/obj/host/arm-linux-gnu/sysroot --host-cc=/usr/bin/gcc --arch=arm --target-os=linux --disable-stripping --pkg-config=/test/armv5/gitdir/linux_gnu_armv5/out/product/fooarmv5.tea5.10-eng/obj/host/bin/pkg-config --disable-static --enable-shared --prefix=/usr --enable-avfilter --disable-version3 --enable-logging --enable-optimizations --disable-extra-warnings --enable-avdevice --enable-avcodec --enable-avformat --enable-network --disable-gray --enable-swscale-alpha --disable-small --enable-dct --enable-fft --enable-mdct --enable-rdft --disable-crystalhd --disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables --disable-msa --enable-hwaccels --disable-cuda --disable-cuvid --disable-nvenc --disable-avisynth --disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libvo-amrwbenc --disable-symver --disable-doc --disable-gpl --disable-nonfree --enable-ffmpeg --enable-ffplay --enable-avresample --disable-ffprobe --disable-libxcb --disable-postproc --enable-swscale --enable-indevs --enable-alsa --enable-outdevs --enable-pthreads --enable-zlib --enable-lzo --disable-bzlib --disable-libfdk-aac --disable-libcdio --disable-gnutls --enable-openssl --enable-libdrm --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-mmal --disable-omx --disable-omx-rpi --disable-libopencv --disable-libopus --disable-libvpx --disable-libass --disable-libbluray --disable-libmfx --disable-librtmp --disable-libmp3lame --disable-libmodplug --disable-libspeex --disable-libtheora --disable-libwavpack --disable-iconv --enable-libfreetype --disable-fontconfig --disable-libopenjpeg --disable-libx264 --disable-libx265 --disable-libdav1d --disable-libvo_amrwbenc --disable-libopencore-amrwb --disable-x86asm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --disable-armv6 --disable-armv6t2 --disable-vfp --disable-neon --disable-altivec --extra-libs=-latomic --enable-pic --cpu=armv5 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 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 Could not initialize SDL - No available video device (Did you set the DISPLAY variable?)

And I got the same error when run ffplay /test.mp4.
But I can play the video with ffmpeg -re -i /test.mp4 -c:v rawvideo -pix_fmt bgra -f fbdev /dev/fb0.

There is NO libSDL or X in this embedded system.

So how can I play the MP4 with ffplay ? Even more, how to play the MP3 file with ffplay in the system ?

Tried with mpv.

# mpv -vo help Available video outputs: libmpv render API for libmpv gpu Shader-based GPU Renderer null Null video output image Write video frames to image files tct true-color terminals drm Direct Rendering Manager Segmentation fault

Then tried to play mp4.

# mpv ./Quad_split.mp4 Compiled without libass. There will be no OSD and no text subtitles. Playing: ./test.mp4 (+) Video --vid=1 (*) (h264 852x480 29.895fps) Error opening/initializing the selected video_out (--vo) device. Video: no video No video or audio streams selected. Exiting... (Errors when loading file) Segmentation fault

I did NOT find /dev/fb, so I tried followings,

# mpv --vo image /root/test.mp4 Compiled without libass. There will be no OSD and no text subtitles. Playing: /root/test.mp4 (+) Video --vid=1 (*) (h264 852x480 29.895fps) VO: [image] 852x480 yuv420p [vo/image] Saving 00000001.jpg V: 00:00:00 / 00:00:09 (0%) [vo/image] Saving 00000002.jpg V: 00:00:00 / 00:00:09 (1%) [vo/image] Saving 00000003.jpg V: 00:00:00 / 00:00:09 (1%) [vo/image] Saving 00000004.jpg V: 00:00:00 / 00:00:09 (1%) [vo/image] Saving 00000005.jpg V: 00:00:00 / 00:00:09 (2%) [vo/image] Saving 00000006.jpg V: 00:00:00 / 00:00:09 (2%) [vo/image] Saving 00000007.jpg V: 00:00:00 / 00:00:09 (2%) [vo/image] Saving 00000008.jpg

There are lots of JPG files generated in the current directory, which showed the mpv can work to some extent.

So how to make mpv to work in this embedded system (without X and VT)? Does it need to do some coding with libmpv to play the video on /dev/fb?

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  • Maybe you could use mpv instead. Commented May 30, 2023 at 9:56
  • I tried mpv, but I got segfault withmpv /test.mp4. Either will be OK for me, but current neither is working. Commented May 30, 2023 at 13:17
  • I doubt mpv will work, if ffplay doesn't. Did you try to run the command with the -nodisp option? Commented May 30, 2023 at 15:17
  • Run mpv -vo help, try to find a video output driver which works. Makes sense to try a GIT version. Makes even more sense to file a bug report. Commented May 30, 2023 at 20:08
  • I tried mpv and updated the question with my testing results. I still cannot play MP4 with directly running mpv. Commented May 30, 2023 at 23:48

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