Encoding fails with h264_v4l2m2m codec on android.

[HyundongHwang]

Description
Hello.
I always use it well with gratitude for creating a good library project.
I have to encode or transcode with h264 on android.

When I checked with ffmpeg -encoders, the h264 video codec is provided as a hardware codec, h264_v4l2m2m, but when I use it, the following error occurs and it does not work.
It is not h264_v4l2m2m, but it works well when I encode with another codec, mpeg4.
Of course, since I want h264 output, I want h264_v4l2m2m or another alternative.
Is it okay if I install an additional codec for h264 encoding if I cannot use h264_v4l2m2m?

[h264_v4l2m2m @ 0xb400007b1ac71d40] Could not find a valid device
[h264_v4l2m2m @ 0xb400007b1ac71d40] can't configure encoder
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

Logs

• input cmd

ffmpeg -i '/storage/emulated/0/Android/data/app.streamstudio.stream/files/class/class000046_NewJeans_Supernatural_hoois127/class_front_1080p_gop1_crf27.mp4' -c:v h264_v4l2m2m -c:a aac '/storage/emulated/0/Android/data/app.streamstudio.stream/files/out_250224_112854.mp4'

• out log

ffmpeg version v4.4-dev-416
 Copyright (c) 2000-2020 the FFmpeg developers
  built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
  configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android21-clang --cxx=aarch64-linux-android21-clang++ --extra-libs='-L/storage/light/projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disab
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 96.100 / 58. 96.100
  libavformat    58. 48.100 / 58. 48.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/app.streamstudio.stream/files/class/class000046_NewJeans_Supernatural_hoois127/class_front_1080p_gop1_crf27.mp4':
  Metadata:
    major_brand     : 
isom
    minor_version   : 
512
    compatible_brands: 
isomiso2avc1mp41
    encoder         : 
Lavf60.3.100
  Duration: 
00:00:25.01
, start: 
0.000000
, bitrate: 
14924 kb/s
    Stream #0:0
(und)
: Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1080x1920, 14789 kb/s
, 
30 fps, 
30 tbr, 
15360 tbn, 
60 tbc
 (default)
    Metadata:
      handler_name    : 
Core Media Video
      encoder         : 
Lavc60.3.100 libx264
    Stream #0:1
(und)
: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 131 kb/s
 (default)
    Metadata:
      handler_name    : 
Core Media Audio
Stream mapping:
  Stream #0:0 -> #0:0
 (h264 (native) -> h264 (h264_v4l2m2m))
  Stream #0:1 -> #0:1
 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[graph 0 input from stream 0:0 @ 0xb400007c8a93c110] sws_param option is deprecated and ignored
[h264_v4l2m2m @ 0xb400007b1ac71d40] Could not find a valid device
[h264_v4l2m2m @ 0xb400007b1ac71d40] can't configure encoder
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
[aac @ 0xb400007b1ac6edd0] Qavg: 152.892
[aac @ 0xb400007b1ac6edd0] 2 frames left in the queue on closing
Conversion failed!
ffmpeg version v4.4-dev-416
 Copyright (c) 2000-2020 the FFmpeg developers
  built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)

  configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android21-clang --cxx=aarch64-linux-android21-clang++ --extra-libs='-L/storage/light/projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel

  libavutil      56. 55.100 / 56. 55.100

  libavcodec     58. 96.100 / 58. 96.100

  libavformat    58. 48.100 / 58. 48.100

  libavdevice    58. 11.101 / 58. 11.101

  libavfilter     7. 87.100 /  7. 87.100

  libswscale      5.  8.100 /  5.  8.100

  libswresample   3.  8.100 /  3.  8.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/app.streamstudio.stream/files/class/class000046_NewJeans_Supernatural_hoois127/class_front_1080p_gop1_crf27.mp4':

  Metadata:

    major_brand     : 
isom
    minor_version   : 
512
    compatible_brands: 
isomiso2avc1mp41
    encoder         : 
Lavf60.3.100
  Duration: 
00:00:25.01
, start: 
0.000000
, bitrate: 
14924 kb/s
    Stream #0:0
(und)
: Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1080x1920, 14789 kb/s
, 
30 fps, 
30 tbr, 
15360 tbn, 
60 tbc
 (default)
    Metadata:

      handler_name    : 
Core Media Video
      encoder         : 
Lavc60.3.100 libx264
    Stream #0:1
(und)
: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 131 kb/s
 (default)
    Metadata:

      handler_name    : 
Core Media Audio
Stream mapping:

  Stream #0:0 -> #0:0
 (h264 (native) -> h264 (h264_v4l2m2m))
  Stream #0:1 -> #0:1
 (aac (native) -> aac (native))
Press [q] to stop, [?] for help

[graph 0 input from stream 0:0 @ 0xb400007c8a93c110] sws_param option is deprecated and ignored

[h264_v4l2m2m @ 0xb400007b1ac71d40] Could not find a valid device

[h264_v4l2m2m @ 0xb400007b1ac71d40] can't configure encoder

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

[aac @ 0xb400007b1ac6edd0] Qavg: 152.892

[aac @ 0xb400007b1ac6edd0] 2 frames left in the queue on closing

Conversion failed!

Environment

• Platform: Android (samsung galaxy s22 ultra)
• Architecture: arm64-v8a
• Version: LTS
• Source branch: main
• Android Studio version: LTS
• Android NDK version: LTS