[Bug]: FFMPEG transcoding with mediacodec first keyframe missing or damaged after ffmpeg update

[osts]

Problem description

FFMPEG transcoding of 4K x264 video to x265(hevc) with mediacodec hardware acceleration first video file keyframe is missing or damaged after ffmpeg update to version 7.1-1 . The video file is usable after the next keyframe(GOP). Transcoding is performed with Orange PI 5 plus device based on Rockchip RK3588 processor and running on Android 12. Thanks to the availability of another Android device with termux and an older ffmpeg by making a backup and restoring it on an Orange PI I recovered a version of ffmpeg that works. This version of ffmpeg is 6.1.2. I transcoding video from the sftp server and put back transcoded video to this sftp server. Termux command is:

ffmpeg -c:v h264_mediacodec -i sftp://user:pass@10.0.0.21:2122/128GB_SD3/Lietuva/VID_20230809_194129.mp4 -map 0:v -c:v hevc_mediacodec -bitrate_mode 1 -b:v 32000k -pix_fmt nv12 -g 180 -map 0:a -c:a:0 copy sftp://user:pass@10.0.0.21:2122/DATA_D/foto/Lietuva/034_Vilna_0908_2023_30.mp4

I used Orange PI with termux for transcoding of video, because transcoded video quality is way better than transcoded with NVIDIA or AMD hardware acceleration. I noticed, that ffmpeg7.1-1 hardware transcoding performs much faster than ffmpeg 6.1.2 , but first keyframe problem prevents me to use it. I would be very happy if I could get a working ffmpeg 7 version for termux, without this unpleasant artifact.

What steps will reproduce the bug?

Run transcode with ffmpeg 7.1-1 on termux

ffmpeg -c:v h264_mediacodec -i sftp://user:pass@10.0.0.21:2122/128GB_SD3/Lietuva/VID_20230809_194129.mp4 -map 0:v -c:v hevc_mediacodec -bitrate_mode 1 -b:v 32000k -pix_fmt nv12 -g 180 -map 0:a -c:a:0 copy sftp://user:pass@10.0.0.21:2122/DATA_D/foto/Lietuva/034_Vilna_0908_2023_30.mp4

What is the expected behavior?

Transcoded video with normal first keyframe, same as with ffmpeg 6.1.2

System information

Termux Variables:
TERMUX_EXEC__PROC_SELF_EXE=/data/data/com.termux/files/usr/bin/termux-info
TERMUX_VERSION=googleplay.2024.10.30
TERMUX__USER_ID=0
Packages CPU architecture:
aarch64
Subscribed repositories:
# sources.list
deb https://termux.net stable main
Updatable packages:
apt/stable 2.9.21 aarch64 [upgradable from: 2.9.10]
command-not-found/stable 2.4.0-57 aarch64 [upgradable from: 2.4.0-48]
curl/stable 8.11.1 aarch64 [upgradable from: 8.10.1-2]
debianutils/stable 5.21 aarch64 [upgradable from: 5.20]
ed/stable 1.21 aarch64 [upgradable from: 1.20.2]
ffmpeg/stable 7.1-1 aarch64 [upgradable from: 6.1.2]
glib/stable 2.82.4 aarch64 [upgradable from: 2.82.2]
harfbuzz/stable 10.1.0-1 aarch64 [upgradable from: 10.0.1]
inetutils/stable 2.5 aarch64 [upgradable from: 2.4-2]
less/stable 668 aarch64 [upgradable from: 661]
libaom/stable 3.11.0 aarch64 [upgradable from: 3.10.0]
libc++/stable 27c aarch64 [upgradable from: 27b]
libcurl/stable 8.11.1 aarch64 [upgradable from: 8.10.1-2]
libexpat/stable 2.6.4 aarch64 [upgradable from: 2.6.3]
libjpeg-turbo/stable 3.1.0 aarch64 [upgradable from: 3.0.4]
libltdl/stable 2.5.4 aarch64 [upgradable from: 2.5.3]
libnghttp3/stable 1.7.0 aarch64 [upgradable from: 1.6.0]
libopenmpt/stable 0.7.13 aarch64 [upgradable from: 0.7.11]
libpixman/stable 0.44.2 aarch64 [upgradable from: 0.43.4]
librav1e/stable 0.7.1-2 aarch64 [upgradable from: 0.7.1-1]
libsmartcols/stable 2.40.2-2 aarch64 [upgradable from: 2.40.2-1]
libsrt/stable 1.5.4 aarch64 [upgradable from: 1.5.3]
libssh/stable 0.11.1 aarch64 [upgradable from: 0.10.6]
libvpx/stable 1:1.15.0-1 aarch64 [upgradable from: 1:1.15.0]
libwebp/stable 1.5.0 aarch64 [upgradable from: 1.4.0-rc1-0]
libx265/stable 4.1 aarch64 [upgradable from: 3.5-p20230222-0]
libxau/stable 1.0.12 aarch64 [upgradable from: 1.0.11]
libxml2/stable 2.13.5 aarch64 [upgradable from: 2.13.4-1]
libxrender/stable 0.9.12 aarch64 [upgradable from: 0.9.11]
mpg123/stable 1.32.10 aarch64 [upgradable from: 1.32.9]
nano/stable 8.3 aarch64 [upgradable from: 8.2]
util-linux/stable 2.40.2-2 aarch64 [upgradable from: 2.40.2-1]
xxhash/stable 0.8.3 aarch64 [upgradable from: 0.8.2]
termux-tools version:
3.0.8
Android version:
12
Kernel build information:
Linux localhost 5.10.160 #15 SMP PREEMPT Wed Oct 18 16:12:23 CST 2023 aarch64 Android
Device manufacturer:
rockchip
Device model:
orangepi5plus
LD Variables:
LD_LIBRARY_PATH=
LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so