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<hsv>
Hi, can ffmpeg report if a rtsp h264 stream is cbr or avbr? ffprobe seems to report the same.
<hsv>
(or h265 for that matter)
<JEEB>
CBR is not well defined
<JEEB>
it can be everything from "each picture is coded by the same size" (which is not really done much)
<JEEB>
to "within a specific buffer size the average size is constant"
<JEEB>
you can get the video packet sizes with ffprobe's `-select_streams v -show_packets`
<JEEB>
if you like to parse json, there's `-of json`
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<hsv>
i'm trying to work out if the firmware (openipc) even does cbr. There are options to set the codec (h264/h264), video bitrate, but mode but only has 'avbr' as an option.
<JEEB>
as I said, what is CBR?
<JEEB>
there is no single definition
<hsv>
sure, i understand what you say.
<JEEB>
for most sort of streaming I only care about maxrate over bufsize
<JEEB>
microsoft out of all places IIRC had a good explanation of the leaky bucket model
<hsv>
If it supports it at all, in whatever form, it is perhaps detectable.
<JEEB>
you define what you are looking for first, then try to script it based on the packet sizes
<JEEB>
the simplest is "are all packets of the same size?"
<JEEB>
almost nothing does that since it's dumb
<JEEB>
everything else deals with some sort of a buffer
<hsv>
i'm unsure what it does with the video bitrate setting.
<JEEB>
anyways, if you require a very specific type of CBR then you should know the definition of t
<JEEB>
*it
<JEEB>
if you do not, then generally you do not need CBR
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<JEEB>
you just want that the average bit rate over a buffer size that you configure the encoder and clients to does not exceed the general rate that the clients can receive data at
<JEEB>
aka the VBV/HRD model
<hsv>
i read that CBR is better of cctv especially poorly lit scenes.
<hsv>
*for
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<JEEB>
no
<JEEB>
what you need is to just have an encoder that does not specifically drop quality all over the place if it's dark
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<JEEB>
trying to force a CCTV encoder to always utilize higher bit rates is just a hack around an encoder that does dumb things
<JEEB>
it has nothing to do with CBR vs ABR, it would also work with ABR if you just enable the encoder to utilize more bit rate
<hsv>
i'm using open source firmware - openipc (although not truly 'open' yet)
<JEEB>
or you disable some option that says "if there's no light, drop bit rate to zero"
<JEEB>
but this is so specific to the plastic box encoder you're using that the only way to check is to literally test it
<JEEB>
with content and to look at whether it bodges things or not
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<hsv>
ok, with -show_packets then 'size' is the field to look at?
<JEEB>
yup
<hsv>
With RC mode set to 'avbr' there is no discernable difference in ffprobe output with video bitrate set to 1kbps or 32768kbs.
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<Doeme>
Hi! I have a libav-question: I have an ogg file which contains an audio stream (vorbis) and a single static cover image (png). This results in two streams being found in "avformat_find_stream_info" (0 => vorbis, 1 => png), however, if I try to seek in this file with "av_seek_frame" with stream_index = 1 (the png file) libav abort()s due to stream_index >= nstreams in oggdec.c
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<d33cee>
Hi all, hoping this is the right place to troubleshoot my v4l2loopback issues. I _had_ one problem but today it seems I have a different problem. I'm using v4l2loopback to create a webcam device, so that ffmpeg can capture my screen and send it to that device. Previously, this worked except that it seemed to force a certain ratio, which showed less of the screen than desired.
<d33cee>
Today, the problem is that the display is flipped horizontally. Not something I've seen it do before.
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<d33cee>
I'm trying to read the docs to see if I've given it the wrong options, but right now I'm having trouble finding what this option is CALLED. Specifically, the '+' part: ":0.0+960,0"
<d33cee>
It seems like this might be specific to X11 grabbing, as that notation only appears in the "6.2 X11 grabbing" section
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<d33cee>
What could make the horizontal flip inconsistent? I hesitate to try -display_hflip without understanding why it happened in the first place.
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