AV1 YouTube bitrate drop until stream restart #10383
Comments
Please reproduce this without any third-party plugins. Please also test with any other codec. Dropped frames are purely related to network conditions and they are handled separately from the encoding process, so I cannot imagine this has anything to do with the codec choice. Please also test with HLS. Provide logs for each different test.
The first user's case sounds like typical dropped frames due to fluctuating network conditions.
This indicates that this isn't a new issue for 30.1. |
Thats the thing, it never happens with other codecs and I have thousands of hours streamed. With 3rd party plugins and without them. Could it just be AV1 not being able to reconnect after a brief ISP drop maybe? |
AV1 is a codec, not a streaming protocol. The codec isn't responsible for reconnection. There could be two separate issues:
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Even when my internet dies for a few seconds, h264 codecs keep running and after a while bitrate goes back up and stabilizes. With AV1 stream needs to be restarted. |
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Hello. Just wanted to add that I'm having the same issue in March 2024 with RTX 4070Ti on the most current driver. Trying to use AV1 to stream to YouTube and the stream bitrate drops randomly and requires a restart in OBS. Very frustrating. I will be reverting back to HEVC or H.264 until this apparent AV1 issue gets resolved. From what I'm seeing, I think it's either an issue with NVIDIA hardware/firmware (more likely firmware), OBS implementation of AV1, or YouTube's ingest of AV1. Difficult to pin down which one, but it's clear steaming AV1 to YouTube with OBS has issues. |
Please provide a log file from when this occurs, preferably without any third-party plugins. |
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So I have been using HEVC for the past few days and it runs PERFECTLY with the exact same setup, plugins and OBS version (also 4070Ti). So maybe it really is an Nvidia issue. HEVC resumes streaming just fine while AV1 dies and requires restart. |
Please provide a new log file when you retest. |
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So I'm using a AMD RX7600 with AV1 on a Linux machine (Arch Linux kernel: 6.8.1-arch1-1) and having the same problem than you guys. So, it can be a think not exclusive to NVIDIA cards. It happens for me after one hour of streaming in average, then it keeps happening for every five minutes needing to open OBS Studio again. It is very annoying. I don't use any third-party plugins and I still have all the issues commented above. |
Please provide a log file. |
Good to know. Thanks for sharing. This helps narrow it down a bit. I think the fact that your having this issue on an AMD card pretty much eliminates the possibility of it being something to do with the GPU hardware or firmware. So, it must be something with OBS, YouTube, or both. |
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@RytoEX I just completed a 3 hour test stream session with AV1 encoding to YouTube to collect a good log file. I uploaded via the OBS upload prompt. Here is the URL for the log (also attached at the end of this post): https://obsproject.com/logs/EfrhJz5VpyBsHJ0A I did leave 2 plugins installed because these are critical for my workflow and wanted to test with them running to see if they are causing the issue. The 2 plugins are the Multi RTMP plugin and the Stream Deck plugin. I also often use Source Record, but I uninstalled it for this test. If you absolutely need a log with no 3rd party plugins installed, let me know and I can try to get another test in. Here are other parameters of the test so people can easily reference them: Internet upload speed: 22-25 Mbps over wired ethernet YouTube Stream (set up through OBS default streaming output)Service: YouTube - RTMPS Twitch Stream (set up through Multi RTMP plugin)Res: 1920x1080 Any insights you might be able to share would be much appreciated. Other things I have considered testing, but have not yet: |
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@ArktixOfficial Please provide a log of when the issue occurs. Ideally, yes, one without third-party plugins would ensure that only our code is running. If you cannot get a log without third-party plugins, then as few as possible will have to do, but zero really is best. |
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@RytoEX Sorry if I didn’t make this clear, but the log file I provided is from a 3 hour test stream where the issue did occur. It occurred towards the end of the session and I stopped and restarted the stream in OBS to revive the YouTube stream. Let me know if I can provide any additional info. I will try to run a test without plugins installed, but I have limited time where I can lock up all my upload bandwidth for a test during the next week or so. Not sure when I’ll be able to do it. |
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I made an extensive test just like @ArktixOfficial. All tests were made recording to YouTube:
After hours of tests I found one important fact that happens very frequently. When using H265 when I have an internet drop it can recover from it and keeps running the stream, but when I use AV1, if any network inconsistency happen, the streaming bit rate spirals down to 166/167kbps and keeps there until I stop and start streaming again. It simple does not recover from this drop. I found a simple way to force a network inconsistency, you just need to open any internet speed tester and run it 12. When it goes to the upload part and goes up to the maximum upload speed:
Footnotes
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After some consideration, I've noticed that the bit rate drops to approximately 160kbps, coincidentally matching the default audio bit rate. This issue might stem from the AV1 video encoder crashing, resulting in only the audio being transmitted to YouTube's servers. What do you think @RytoEX? |
Sounds plausible. We have a vague idea of what could be happening, but we'll need to investigate further. |
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For those affected, please test the arfifacts, when available, from #10436 if you are able to do so. |
I have noticed the same. A bit of additional info that may be helpful: While streaming, my viewers have noticed that the YouTube stream often goes down right around intense combat scenes and/or when I’m laughing or otherwise being loud in my mic. Not all crashes occur during these times, but it seems increased audio data may have some influence on triggering the stream to crash. However, my audio bite rate is set to 320Kbps in OBS, but YouTube still tells me that it’s getting around 160Kbps. OBS is still showing that it’s pushing the full 11,500Kbps I set. It does seem like an odd coincidence that YouTube reports it’s getting a bit rate roughly equivalent to the default audio bit rate during these stream crash instances. Perhaps when increased audio data is being received by YouTube it hooks those larger audio packets as the video packets and gets confused about the bite rate it’s receiving? I’m not a dev, so just my speculation. Apologies if I’m using terminology incorrectly. |
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@LucasSnatiago Thanks for your additional tests and info! I agree it seems to be that the video encoder dies and only the audio is being sent to YouTube. I’m not sure how to reconcile the fact that my output audio bitrate is set to 320Kbps, but YouTube tells me it’s receiving roughly 160Kbps during the crash periods. Perhaps it’s not able to accept 320Kbps or maybe it’s compressing the audio before reporting that figure, not sure. Good thinking running a speed test to force a network inconsistency! I will try that next time I’m able to run a test. |
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@derrod it seems that there is an error during the generation of the artifacts for Linux. It didn't generate any artifacts for Ubuntu. |
Should be fine now: https://github.com/obsproject/obs-studio/actions/runs/8440309705?pr=10436 |
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Fixed!!!
For each test, I disconnected my internet cable twice, waited for 5 seconds each time, and then reconnected it. Both AV1 and H265 were able to recover from the network failure and continue running for hours without crashing. However, during the 2-minute test using default OBS settings, it crashed twice. @ArktixOfficial, could you please conduct similar tests? A 2-minute test for each scenario should suffice. Simply follow the steps outlined above. |
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@LucasSnatiago Thanks for doing those additional tests and sharing the results! I’m happy to do some tests as well. I should be able to within the next few days. Do you know if there are their instructions I can reference for how to install/utilize the new build? I’m not familiar with artifacts or how to use them. Sorry, just not very knowledgeable in this area and I don’t want to mess up my OBS while I need to use it for production. If there’s a simple way for me to test and then revert back to my current version of OBS, I’m happy to do some tests. |
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@ArktixOfficial I can help you to do your tests, first what is your operating system? So I can explain all the steps here. |
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@LucasSnatiago Thanks! I’m on Windows 11. |
Operating System Info
Windows 11
Other OS
No response
OBS Studio Version
30.1.0
OBS Studio Version (Other)
No response
OBS Studio Log URL
https://obsproject.com/logs/VJcmhy0uy4lERRpI
OBS Studio Crash Log URL
No response
Expected Behavior
A stable AV1 stream to YouTube with a fairly beefy dedicated streaming PC.
Current Behavior
Nvidia AV1 stream to YouTube randomly drops bitrate to ~160kbps and stays there until stream is restarted.
Steps to Reproduce
...
Anything else we should know?
I have been trying to stream with Nvidia AV1 for about a year now (since AV1 OBS release) and tried every new update. I never have similar issues with other encoders, so I dont think it has anything to do with my ISP. Im afraid the log doesnt show anything except :
13:31:45.549: Output 'adv_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 6283 (1.0%)
But let me repeat, my internet runs just fine and this only happens with AV1.
During my stream (usually 16000 kbps), the bitrate drops to ~160kbps and stays there until I restart the stream. Nothing seems to trigger this unfortunately and it happens at random time intervals (sometimes runs fine for days, other times drops every 10 minutes)
This issue seems to be random, but I think it happens more during weekends and busy hours. (So possibly YT servers?)
I have been searching for other users with similar problems and I found a lot of them, but noone seems to have a clue about why this could be happening: https://obsproject.com/forum/threads/av1-live-streaming-on-youtube-not-working-please-help.168513/
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