Thanks but they didn't make any difference. I have confirmed it's an issue with the ffmpeg output when drm is enabled. I used the following to extract a single frame from a video using drm. ffmpeg -hwaccel drm -hwaccel_device /dev/dri/renderD128 -ss 00:00:10 -i "input.mkv" -frames:v 1 -q:v 2 "output%03d.jpg" It produces an image but it's nearly all green. If I remove the -hwaccel drm option the image produced is correct. I tried PNG format as well to rule out a format issue and got the same result. After the above result I tried ffmpeg -hwaccel drm -hwaccel_device /dev/dri/renderD128 -i "input.mkv" "output.mkv" As it's using default settings this converts the video to x264 output.mkv still plays as a black screen in mpv but when I play it with ffplay I get a video covered in green with splashes of purple here and there. Edit: I should clarify you can still make out the video contents, it's just the colours are messed up. It's mainly all green with purple flickers occasionally. So I guess I need to play around with ffmpeg.... the last time I tried to build my own it wasn't a fun time. Also unrelated to this issue but I found the cause of the invalid argument 22 error I mentioned earlier when playing x264 videos. 10 bit x264 videos are unsupported. Using -pix_fmt yuv420p when encoding changes it to an 8bit video which plays successfully in mpv with drm. I don't normally have 10bit x264 but when I was testing I converted a x265 to x264 and it must have maintained the pixel format. Edit: By adding the --vf=format=rgba to the mpv command line I can get mpv to play the file like ffplay does. Lots of green and purple but at least it displays an image instead of a black screen. I tried a bunch of different formats but they all come out exactly the same, except for --vf=format=gray. This plays a perfect black and white version of the video. For some frames the colours are correct in places but there is a lot of green blocky squares everywhere. So I don't think it's a format issue, I think ffmpeg is just screwing up the colour space for parts of the frame for certain width videos when drm is used.

Can't figure how to copy putty terminal output messages, the terminal sent more messages but I can't find how to copy to a text file.

What you now need to capture is the initial boot loader messages, what you are showing here look to me to be messages from a booted android linux kernel

Now seems that boots, I just need to touch the metal part of power button when click to give power and then starts to message events. [ 27.438701@2] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.442840@2] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.449129@1] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.455380@2] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.461729@2] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.467993@3] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.474575@3] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.480723@3] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.487114@3] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.493447@3] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.499798@1] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.506161@1] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.512469@1] dhd_dbg_set_event_log_tag set log tag iovar failed -23 [ 27.521394@3] dhd_dbg_attach_pkt_monitor, 1501 [ 27.526673@3] net_os_enable_packet_filter: val = 0 [ 27.530649@2] net_os_rxfilter_add_remove: add_remove = 0, num = 2 [ 27.536809@3] net_os_enable_packet_filter: val = 1 [ 27.541011@3] net_os_enable_packet_filter: val = 0 [ 27.544909@3] net_os_rxfilter_add_remove: add_remove = 0, num = 3 [ 27.551271@0] net_os_enable_packet_filter: val = 1 [ 27.555831@1] dhd_set_suspend: Remove extra suspend setting [ 27.560882@1] dhd_enable_packet_filter: enter, value = 0 [ 27.622938@2] init: [libfs_mgr]Unable to open zram conf comp device /sys/block/zram0/max_comp_streams [ 30.111457@3] [dhd-wlan0] wl_run_escan : LEGACY_SCAN sync ID: 0, bssidx: 0 [ 34.581269@1] [dhd-wlan0] wl_cfg80211_connect : Connecting with 3c:47:11:4d:2a:ff ssid "WiFi_2AFF", len (9), sec=wpa2psk/tkipaes, channel=1 [ 34.581269@1] [ 34.612484@0] dhd_dbg_start_pkt_monitor, 1621 [ 34.612522@0] __dhd_dbg_free_tx_pkts, 1412 [ 34.615294@0] __dhd_dbg_free_rx_pkts, 1431 [ 34.638471@3] [dhd-wlan0] wl_iw_event : Link UP with 3c:47:11:4d:2a:ff [ 34.639572@3] [dhd-wlan0] wl_ext_iapsta_event : [S] Link UP with 3c:47:11:4d:2a:ff [ 34.649918@2] [dhd-wlan0] wl_bss_connect_done : Report connect result - connection succeeded [ 34.685204@1] [dhd-wlan0] wl_add_keyext : key index (0) [ 34.743323@2] dhd_dev_apf_get_version: firmware doesn't support APF [ 34.743986@2] dhd_dev_apf_get_max_len: firmware doesn't support APF [ 34.816935@0] dhd_ndo_remove_ip_by_type: failed, retcode = -14 [ 34.817143@0] dhd_dev_ndo_cfg: failed to update host ip addr: -14 [ 34.856175@0] net_os_enable_packet_filter: val = 0 [ 34.858467@0] net_os_rxfilter_add_remove: add_remove = 1, num = 2 [ 34.871997@0] net_os_enable_packet_filter: val = 1 [ 34.973661@2] dhd_set_suspend: Remove extra suspend setting [ 34.976808@2] dhd_enable_packet_filter: enter, value = 0 [ 35.068208@0] dhd_arp_get_arp_hostip_table: ioctl WLC_GET_VAR error -23 [ 35.070340@1] dhd_aoe_hostip_clr failed code -23 [ 35.076591@1] aoe_update_host_ipv4_table failed [ 50.164518@1] [dhd-wlan0] wl_run_escan : LEGACY_SCAN sync ID: 1, bssidx: 0 [ 50.945561@3] audit: audit_lost=13 audit_rate_limit=5 audit_backlog_limit=64 [ 50.946974@3] audit: rate limit exceeded [ 53.223909@1] audit: audit_lost=15 audit_rate_limit=5 audit_backlog_limit=64 [ 53.225408@1] audit: rate limit exceeded [ 54.252938@1] audit: audit_lost=28 audit_rate_limit=5 audit_backlog_limit=64 [ 54.254399@1] audit: rate limit exceeded [ 82.286034@3] [dhd-wlan0] wl_run_escan : LEGACY_SCAN sync ID: 2, bssidx: 0 [ 94.451441@3] dhd_dbg_monitor_get_tx_pkts, 1913 [ 94.451532@3] dhd_dbg_monitor_get_tx_pkts(): no tx_status in tx completion messages, make sure that 'd11status' is enabled in firmware, status_pos=0 [ 94.466807@2] dhd_dbg_monitor_get_rx_pkts, 2010 [ 122.294218@3] [dhd-wlan0] wl_run_escan : LEGACY_SCAN sync ID: 3, bssidx: 0

Now appear this on terminal.