Update FFmpeg flags for hardware vaapi

[h0nIg]

Hi,

i just started to use go2rtc and came across an issue with h264 and the baseline profile. It looks like some streams over-declare their required capabilities

https://github.com/FFmpeg/FFmpeg/blob/0e9956a06e9307e01232bc354665fadf6f7a09df/libavcodec/options_table.h#L402C1-L403C1

// Allowing a profile mismatch can be useful because streams may
 // over-declare their required capabilities - in particular, many
// H.264 baseline profile streams (notably some of those in FATE)
// only use the feature set of constrained baseline.

Therefore it is a good idea to add this parameter to be more resillient. On top of that "raw" option does not work as the following error will be thrown:

Codec AVOption hwaccel_flags () is not an encoding option.

[skrashevich]

you can manipulate input parameters via "#input" option, not "#raw"

from readme:

You can use input param to override default input template (ex. #input=rtsp/udp will change RTSP transport from TCP to UDP+TCP)
You can use raw input value (ex. #input=-timeout 5000000 -i {input})
You can add your own input templates

[AlexxIT]

Thanks!

[AlexxIT]

https://github.com/AlexxIT/go2rtc/releases/tag/v1.7.0