ffmpeg - Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

[niyazFattahov]

Im trying use this cedar with ffmpeg and get:

ffmpeg -f lavfi -i testsrc=duration=2:size=1280x720:rate=30 testsrc.h264 -y

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.4.0 (Buildroot 2020.02.1)
configuration: --enable-cross-compile --cross-prefix=/home/niyaz/licheepizero_linux_build_latest/buildroot_rootfs/buildroot-2020.02.1/output/host/bin/arm-buildroot-linux-uclibcgnueabihf- --sysroot=/home/niyaz/licheepizero_linux_build_latest/buildroot_rootfs/buildroot-2020.02.1/output/host/arm-buildroot-linux-uclibcgnueabihf/sysroot --host-cc=/usr/bin/gcc --arch=arm --target-os=linux --disable-stripping --pkg-config=/home/niyaz/licheepizero_linux_build_latest/buildroot_rootfs/buildroot-2020.02.1/output/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-mipsdsp --disable-mipsdspr2 --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 --enable-gpl --enable-nonfree --enable-ffmpeg --disable-ffplay --enable-avresample --disable-ffprobe --disable-postproc --enable-swscale --enable-indevs --disable-alsa --enable-outdevs --enable-pthreads --enable-zlib --disable-bzlib --disable-libfdk-aac --disable-libcdio --disable-gnutls --enable-openssl --disable-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 --enable-iconv --disable-libfreetype --disable-fontconfig --disable-libopenjpeg --disable-libx264 --disable-libx265 --disable-libdav1d --disable-x86asm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --enable-armv6 --enable-vfp --enable-neon --disable-altivec --extra-libs=-latomic --enable-pic --cpu=cortex-a7 --enable-omx --enable-swscale --enable-swscale-alpha --enable-filter=scale
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
Input #0, lavfi, from 'testsrc=duration=2:size=1280x720:rate=30':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720 [SAR 1:1 DAR 16:9], 30 tbr, 30 tbn, 30 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_omx))
Press [q] to stop, [?] for help
[h264_omx @ 0x6d440] libOMX_Core.so not found
[h264_omx @ 0x6d440] libOmxCore.so not found
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

[Unturned3]

May I ask how did you manage to solve the problem?

[niyazFattahov]

Did you select glibc libracy in Toolchain menu of your buildroot config? by default it was uclibc and this is not right library. It was the reason for me. Now libOmxCore.so was found, and ffmpeg works with codec. But you will have to make clean, full compile

[Unturned3]

Yeah, I selected glibc in toolchain... But I still get the "ERROR: OMX_Core.h not found" message when compiling ffmpeg with --enable-omx

[niyazFattahov]

I thought you're asking about ffmpeg run issue, not about compilation ffmpeg, because you were are asking here. I had problem with OMX_Core.h not found, but don't remember what I did to solve this, nothing special

[niyazFattahov]

you should try dirclean/rebuild libcedar/ffmpeg

[petit-miner]

Yeah, I selected glibc in toolchain... But I still get the "ERROR: OMX_Core.h not found" message when compiling ffmpeg with --enable-omx

RTFM, no seriously you will need to compile libcedar first (make in buildroot) and after the first build select ffmpeg and the build again. It seems like Buildroot tries to build ffmpeg before libcedar and thats the reason why it fails.

[Unturned3]

It seems like Buildroot tries to build ffmpeg before libcedar and thats the reason why it fails.

Yes, I figured that out after much head-scratching... I did RTFM, but I must've ran a make clean or something of that effect in the middle of the process and forgot about it, so when I tried to re-build ffmpeg it ended up with that error.

By the way, if you don't mind me asking, did you have any success with the encoder? I remember that @niyazFattahov posted somewhere that the most he was able to achieve was 640x480 50FPS encoding at 100% CPU load, and it didn't work for anything above that. The 100% CPU occupation kind of defeats the point of a hardware encoder...

[petit-miner]

I'm currently stuck on the part with ffmpeg runtime issue, I hope I can fix it by compiling with glibc.
The datasheet of the V3s mentions encoding of up to 720p @ 60 FPS.
Yeah thats true, but if you do it in software it isn't in realtime anymore, so the encoder is somewhat useful.

[niyazFattahov]

720@60 if you use this library without ffmpeg I think:
https://github.com/allwinner-zh/media-codec
https://github.com/allwinner-zh/media-codec-lib
and on bsp version (linux 3.4), not mainline

[niyazFattahov]

I've compiled it on Buildroot 2020.02.1, but stuck at launching ./a.out file for reading raw 1080p and getting .h264
here instruction you can try: https://www.cxyzjd.com/article/takeopen/79490010

[Unturned3]

I'm currently stuck on the part with ffmpeg runtime issue, I hope I can fix it by compiling with glibc.

Did you use musl or uclibc-ng? I encountered lots of obscure build errors when using these. glibc is probably the safest bet for now (at least it solved the build errors in my case).

I've compiled it on Buildroot 2020.02.1, but stuck at launching ./a.out file for reading raw 1080p and getting .h264 here instruction you can try: https://www.cxyzjd.com/article/takeopen/79490010

Where can I get the bsp version with the 3.4 kernel? I've actually only used mainline so far.

[petit-miner]

I used uclibc-ng but ran into some runtime issues on the V3s itself. I'm recompiling with glibc as @niyazFattahov suggested.

[niyazFattahov]

I've compiled it on Buildroot 2020.02.1, but stuck at launching ./a.out file for reading raw 1080p and getting .h264 here instruction you can try: https://www.cxyzjd.com/article/takeopen/79490010

Where can I get the bsp version with the 3.4 kernel? I've actually only used mainline so far.

I compiled media-codec library on mainline linux in buildroot 2020.02.1 not bsp.
BSP for v3s located here but it does not have cedar driver support: https://github.com/chengge/v3s-linux-sdk