Mobile-ffmpeg: Unknown encoder 'h264_mediacodec'

[dnhyde]

Description
Cannot speedup Android encoding with mediacodec?
When I use-hwaccel mediacodec -i <video_input> -c:v h264_mediacodec <video_output i get the error E/mobile-ffmpeg: Unknown encoder 'h264_mediacodec'

Is this because there is no support for hwaccel encoders in Android according to the wiki.
Is there a way to speed up my encoding process? I already read through #197

Expected behavior
Speed up decoding (which seems to work) and encoding time in Android

Current behavior
Error: E/mobile-ffmpeg: Unknown encoder 'h264_mediacodec'

Screenshots
n/a

Logs
-hwaccel mediacodec -i input.mp4 -c:v h264_mediacodec -an output.mp4
E/mobile-ffmpeg: Unknown encoder 'h264_mediacodec'

Environment

• Platform: Android
• Architecture: ARMv8 NEON
• Version: mobile-ffmpeg-full-gpl-arm64-v8a-4.2.2-lts-20190703
• Android Studio version: 3.4.2

Other
I have a very low speed even if I use libx264 as encoder and even if I set the flag -preset ultrafast.
Thanks for your work!

[tanersener]

Is this because there is no support for hwaccel encoders in Android according to the wiki.

Yes, MediaCodec encoder is not implemented by ffmpeg, only decoder is available.

Is there a way to speed up my encoding process? I already read through #197

There does not exist a magic option/flag to improve the speed. Using CPU optimizations makes the biggest difference for encoding/decoding.

You can ask this question in ffmpeg mailing list too. FFmpeg developers may have different ideas on improving the encoding speed.

[dnhyde]

Still the libx264 -preset ultrafast should work even on Android right?
Thank you very much for your quick answer

[tanersener]

Still the libx264 -preset ultrafast should work even on Android right?

Yes, it is supported on Android too.

[galex]

Hello @tanersener ,

I see in the Android documentation at Supported Media Formats that h264 is available as an encoder for Android 6+.

How can I use this with mobile-ffmpeg? I tried using version 4.3.1 and 4.4 with -vcodec h264_mediacodec but I still get Unknown encoder h264_mediacodec as a response from ffmpeg.

Thank you in advance!

[tanersener]

@galex Unfortunately h264_mediacodec encoder is not implemented by ffmpeg. See https://trac.ffmpeg.org/wiki/HWAccelIntro. MediaCodec is only available as decoder.