Originally posted by mitteg
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The way this was implemented, is that a separate Streaming 4K option was added in the Network menu, and this presents different streaming encoding options than if you select the original (HD) Streaming option. The full set of streaming codecs are listed in the table in the Streaming section of the manual:
https://pro-av.panasonic.net/manual/...er09_06_01.htm
You'll notice that only the 4K streaming resolutions have both H.264 and H.265 options as all of the HD (and below) streaming resolutions are H.264. Note also that when streaming using the SRT protocol, only 720p and higher encoding resolutions are enabled (this is indicated by a * in the table). The lower resolution (360p and below) streaming options are not available when using SRT.
Having said all that, there HD streaming settings as low as 1 Mbps for 720p25/30 or 1080p25/30 if you need them, but I believe these are H.264 rather than H.265 (HEVC). I'm not entirely sure why there are no H.265/HEVC streaming options in HD, but this is consistent with the internal recording options for the camera which are also H.264-only for 1080p and below and only give you a choice of H.264 or H.265/HEVC in 4K. For the internal recording formats, this decision made some sense as the bitrates for internal recording in HD are high enough that using H.265 rather than H.264 probably doesn't bring about significant improvements in video quality. For the much lower bitrates used for streaming, H.265 seems like it would be more beneficial, even in HD. Perhaps the camera's H.265 encoding implementation is optimized for higher resolutions like 4K, or maybe this is just an oversight, I'm not really sure.
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