- Posts: 1
- Joined: Tue May 18, 2021 7:29 pm
- Real Name: Jason Nerer
Dear All,
I know it's an old topic, but I simple don't get ISO recording quality which is remotely acceptable.
My Setup:
- Atem Mini Pro ISO
- Lacie Portable SSD 1TB
- HDMI input signal (Macbook M1 -> CalDigit -> HDMI Splitter -> Atem)
- Atem Software Control 8.6.1
- Atem Firmware latest (updated as of today)
My Config:
I always configured the Quality Setting such, that the ISO recording quality should be up to 70MBit/s, so I chose one of the profiles and selected: "Quality: Hyperdeck High).
The recorded ISO streams are ok'ish, but especially in darker regions left and right of the screen, I get horrible compression artifacts. When checking the bitrate with "mediainfo" it's always only about 5Mbit/s, way too low.
Then I read, that one can configure custom Encoding Profiles via the Streaming.xml. I copied a profile and configed 64MBit/s, 32MBit/s and 16MBit/s testwise.
Still I have the same problem. Especially darker screens have compression artifacts like crazy, and there is a "pumping effect" in bigger, darker areas.
My Tests:
As a crosscheck I recorded the same scene via Quicktime screenrecorder. This file as well as the Atem's one have quite a similar bitrate.
Atem: 12,4MBit/s
Quicktime: 11,6MBit/s
Even though this bitrate should be absolutely sufficient for a still image and no movement on the screen, the Atem output quality is terrible.
Atem Screenshot:
And the artifacts do not disappear. In contrast the same screenshot from the Quicktime recording which comes at a even lower bitrate.
Quicktime Screenshot:
After days and days of reading / testing / failing I am desparate. If the program stream had these artifacts, fine. But the ISO files must not have them. But whatever I do, I do not even get ISO footage with more that 12MBit/s.
I bought the Atem so I would explicitly not have to put additional load on my CPU while creating a screencast. But this behaviour renders the Atem close to useless for semiprofessional productions. I can not imagine, that BM releases such a product, therefore I still believe (and hope) I made a mistake.
Btw, I do not believe, that its the harddrive:
That's a whopping 387 MByte/s or 3102 MBit/s. Should be enough for 5 70MBit ISO Streams. And I am just recording one!
Can anyone confirm that issue? Can anyone help solving it? I would really like to like the Atem.
Regards
Screencaster
I know it's an old topic, but I simple don't get ISO recording quality which is remotely acceptable.
My Setup:
- Atem Mini Pro ISO
- Lacie Portable SSD 1TB
- HDMI input signal (Macbook M1 -> CalDigit -> HDMI Splitter -> Atem)
- Atem Software Control 8.6.1
- Atem Firmware latest (updated as of today)
My Config:
I always configured the Quality Setting such, that the ISO recording quality should be up to 70MBit/s, so I chose one of the profiles and selected: "Quality: Hyperdeck High).
The recorded ISO streams are ok'ish, but especially in darker regions left and right of the screen, I get horrible compression artifacts. When checking the bitrate with "mediainfo" it's always only about 5Mbit/s, way too low.
Then I read, that one can configure custom Encoding Profiles via the Streaming.xml. I copied a profile and configed 64MBit/s, 32MBit/s and 16MBit/s testwise.
Still I have the same problem. Especially darker screens have compression artifacts like crazy, and there is a "pumping effect" in bigger, darker areas.
My Tests:
As a crosscheck I recorded the same scene via Quicktime screenrecorder. This file as well as the Atem's one have quite a similar bitrate.
Atem: 12,4MBit/s
Quicktime: 11,6MBit/s
Even though this bitrate should be absolutely sufficient for a still image and no movement on the screen, the Atem output quality is terrible.
Atem Screenshot:
And the artifacts do not disappear. In contrast the same screenshot from the Quicktime recording which comes at a even lower bitrate.
Quicktime Screenshot:
After days and days of reading / testing / failing I am desparate. If the program stream had these artifacts, fine. But the ISO files must not have them. But whatever I do, I do not even get ISO footage with more that 12MBit/s.
I bought the Atem so I would explicitly not have to put additional load on my CPU while creating a screencast. But this behaviour renders the Atem close to useless for semiprofessional productions. I can not imagine, that BM releases such a product, therefore I still believe (and hope) I made a mistake.
Btw, I do not believe, that its the harddrive:
- Code: Select all
dd if=/dev/urandom of=testfile bs=1m count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 2.640095 secs (406705753 bytes/sec)
That's a whopping 387 MByte/s or 3102 MBit/s. Should be enough for 5 70MBit ISO Streams. And I am just recording one!
Can anyone confirm that issue? Can anyone help solving it? I would really like to like the Atem.
Regards
Screencaster