Gary_E
Second Unit
- Joined
- May 6, 1999
- Messages
- 366
I’ve read many posts, both on HTF and AVS, concerning capturing digital and high-def programming. High-def captures do not interest me at this time because I do not have a PC connected to my HT, so viewing high-def captures is not possible. This kept my interest focused on capturing the higher quality SD ATSC signals offered by my local OTA networks.
My experiment began using my Samsung SIR T-150 high-def receiver. I connected the T-150 to my All-In-Wonder 7500 video card with S-video and composite cables and I was able to capture the ATSC signal, producing a high quality capture. The drawback to this process was that the T-150 was in a different room, so running the cables and changing channels was a pain.
When a local store offered the LG 4200 high-def receiver for under $150, I purchased a unit to be used exclusively for ATSC captures. There would be no connection to a high-def monitor, only an S-video and composite audio connection to the dongle on the ATI card. I left the output switch on the 4200 set to 480i, although I believe this setting is irrelevant since the S-video and composite outputs are 480i regardless of the output setting on the STB.
Finding the correct combination of settings between the capture card and the STB was the trickiest part of the process. After experimenting with different capture settings on the ATI card and different display ratio settings on the STB, the resulting captures were very good, far superior to the analog captures of the same program.
ATI 7500 capture settings used with Multi Media Center version 9.1.
Format - MPEG-2
Standard - NTSC (525)
Resolution - 720x480
Audio Format – 48,000 KHz, 16Bit, Stereo
For 4:3 programming, the STB’s ratio setting is set to ‘CROPPED’, capturing the full frame image without the window-box black or grey bars on either side.
For 16x9 programming, the STB’s picture ratio is set to ‘SET BY PROGRAM’. This setting is deceiving because while viewing the screen during the capture, the image is displayed both letterboxed and window-boxed. However, when playing back the captured file, the image is displayed letterboxed only.
This process is not without problems. When capturing from the STB, the entire program stream is recorded. This includes a thin, moving, dotted line, running either above, below or on the side of the letterbox or window-box outer borders. I assume that if this file is played back on a regular TV, this line (data stream) would be beyond the over scan parameters and not be visible. My solution is to re-encode the video, slightly cropping the image, to eliminate the line.
-Gary
My experiment began using my Samsung SIR T-150 high-def receiver. I connected the T-150 to my All-In-Wonder 7500 video card with S-video and composite cables and I was able to capture the ATSC signal, producing a high quality capture. The drawback to this process was that the T-150 was in a different room, so running the cables and changing channels was a pain.
When a local store offered the LG 4200 high-def receiver for under $150, I purchased a unit to be used exclusively for ATSC captures. There would be no connection to a high-def monitor, only an S-video and composite audio connection to the dongle on the ATI card. I left the output switch on the 4200 set to 480i, although I believe this setting is irrelevant since the S-video and composite outputs are 480i regardless of the output setting on the STB.
Finding the correct combination of settings between the capture card and the STB was the trickiest part of the process. After experimenting with different capture settings on the ATI card and different display ratio settings on the STB, the resulting captures were very good, far superior to the analog captures of the same program.
ATI 7500 capture settings used with Multi Media Center version 9.1.
Format - MPEG-2
Standard - NTSC (525)
Resolution - 720x480
Audio Format – 48,000 KHz, 16Bit, Stereo
For 4:3 programming, the STB’s ratio setting is set to ‘CROPPED’, capturing the full frame image without the window-box black or grey bars on either side.
For 16x9 programming, the STB’s picture ratio is set to ‘SET BY PROGRAM’. This setting is deceiving because while viewing the screen during the capture, the image is displayed both letterboxed and window-boxed. However, when playing back the captured file, the image is displayed letterboxed only.
This process is not without problems. When capturing from the STB, the entire program stream is recorded. This includes a thin, moving, dotted line, running either above, below or on the side of the letterbox or window-box outer borders. I assume that if this file is played back on a regular TV, this line (data stream) would be beyond the over scan parameters and not be visible. My solution is to re-encode the video, slightly cropping the image, to eliminate the line.
-Gary