Panasonic DMR series DVD recorders

The Panasonic DMR series is a family of consumer DVD recorders produced by Panasonic (Matsushita) from approximately 2002 through the late 2000s. While designed primarily as DVD recording devices, several models in the series have become widely adopted in the video archival and VHS digitization community for their passthrough time base correction (TBC) capabilities — functioning as affordable alternatives to dedicated TBC hardware.

Passthrough TBC concept

The "passthrough" mode refers to using a DVD recorder's analog video inputs and outputs without actually recording to disc. The incoming analog signal is digitized, processed through the unit's internal frame synchronizer (which corrects timing jitter), and then output as a stabilized signal that can be captured by a separate digitization device such as a USB capture card or dedicated capture hardware.

Despite a common misconception, the passthrough signal on these units does not go through MPEG-2 encoding. This was demonstrated by Brad (user vaporeon800) on VideoHelp by showing that 4:2:2 chroma detail is preserved in passthrough but lost in actual DVD recordings, confirming that the passthrough path operates before the MPEG-2 encoder stage.

The TBC capability in these units is more accurately described as a line TBC — it corrects horizontal line timing errors (tearing, flagging, jitter) but does not perform full-frame time base correction. It also includes a non-TBC frame sync that passes frame-level errors in a semi-corrected manner rather than fully correcting them. For this reason, the community sometimes refers to these units as "TBC-ish" rather than true TBCs. Adding an external frame sync device (such as a DataVideo TBC-1000) upstream can provide the full-frame correction that these units lack.

Typical capture chain

The standard setup for using a Panasonic DMR as a passthrough TBC:

VCR → (S-Video) → Panasonic DMR → (S-Video or HDMI) → capture device → PC

The VCR connects to the DMR's line input via S-Video, and the DMR's output connects to the capture device. The DMR must be powered on and set to the appropriate line input, but does not need a working DVD drive or disc inserted (though having a disc may be needed to work around certain on-screen display issues on HDD-equipped models).

Video processing chipsets

The passthrough TBC performance of these DVD recorders is determined by their internal video processing ICs. Brad (user vaporeon800) on VideoHelp compiled a spreadsheet documenting which Panasonic chips are used in each model, based on service manual analysis, parts lists, and physical board inspection.

The early DMR-Exx models used chips from two Panasonic IC families:

• MN6737xx series — Used in models from 2001–2003 (DMR-E10, E20, E30, E50, E60, E80, HS2, T-series). These are integrated video processing ICs that handle ADC, 3D Y/C separation, TBC, and frame sync in a single chip. Variants include the MN673793, MN673794, and MN673744.
• MN85573 — Used in the 2004-era models (DMR-E55, E85). This is a separate video processing IC that handles TBC, frame sync, and 3D Y/C, paired with a separate ADC chip (AN13310BA). The block diagram in the E55 service manual shows the signal path as: separate ADC → MN85573 (3DYC + TBC + frame sync) → split to display output and MPEG-2 encoder.

For the ES-series and EH-series models (2004 onward), Panasonic's service manuals do not include schematics for the digital processing PCB, so the specific IC part numbers remain undocumented. However, community testing has established that the ES10 uses a different (and apparently stronger) video processing chipset than the E55/MN85573 generation, and that later models like the ES15, EH55, and EH56 use yet another chip that produces nearly identical results to the ES10. The NTSC models from 2008 onward (DMR-EZxx series) and the DMR-ES20 switched to an LSI/Magnum chipset with significantly weaker passthrough correction.

Model comparison for passthrough TBC

Not all Panasonic DMR models perform equally in passthrough. Community testing — particularly on the German Gleitz forum and VideoHelp — has established a rough performance hierarchy based on the video processing chipsets used.

Tier 1: Strongest passthrough correction

Model	Year	HDD	HDMI	Notes
Panasonic DMR-ES10	2004	No	No	The most widely recommended model. Strongest line-straightening ability. Slightly more prone to losing vertical sync on tape glitches than later models. Uses Panasonic in-house video processing IC (specific part number undocumented). Most consistent across regional variants.
Panasonic DMR-EH50 (PAL)	2005	80GB	No	PAL variants (EB/EG/EP) use the same video processing chipset as the ES10. NTSC variants (P/PC) use a different chipset and may not belong in this tier.
DMR-EH52	—	Yes	No	Reported to use the same chipset as the ES10 (PAL). No dedicated wiki page yet.

Tier 1.5: Near-identical to Tier 1

These models use a different video processing chip from the ES10 but produce the same or nearly the same passthrough results. In A/B testing, users found it difficult to visually differentiate between these and the ES10.

Model	Year	HDD	HDMI	Notes
Panasonic DMR-ES15	2005	No	No	Canadian variant is the DMR-ES16. Noise reduction is aggressive and always on (on/off toggle is more like low/high). Can have side effects on luma/exposure levels.
Panasonic DMR-ES25	2006	No	Yes	Adds HDMI output over the ES15, enabling fully digital passthrough capture.
Panasonic DMR-EH55	2006	200GB	Yes	Last North American HDD model. HDMI output available. Panasonic's own product documentation confirmed TBC capability.
DMR-EH56	—	Yes	Yes	Reported in same performance tier. No dedicated wiki page yet.

Tier 2: Usable but weaker correction

Model	Year	HDD	HDMI	Notes
Panasonic DMR-E55	2004	No	No	Uses Panasonic MN85573 IC. Still useful for removing tearing and flagging, but clearly underperforms Tier 1/1.5 in A/B comparisons.
DMR-E53	—	No	No	Same chipset family as E55. No dedicated wiki page yet.

Models to avoid for passthrough TBC

• DMR-ES20 — Switched to LSI/Magnum chipset despite being in the ES series. Significantly weaker passthrough correction.
• DMR-EZxx series (2008+) — NTSC models from 2008 onward use the LSI/Magnum chipset with little to no useful passthrough jitter correction.
• DMR-EZ47V / DMR-EZ48V — DVD/VHS combo units that are widely regarded as poor performers for VHS playback and passthrough alike.

Regional chipset variations

An important and often overlooked factor is that regional variants of the same model number can use different video processing chipsets. Analysis of service manuals by user Sharc on VideoHelp revealed several cases:

• DMR-ES15 PL (Poland) uses a different video processing chipset than DMR-ES15 EB/EC/EG/EP/EBL
• DMR-EH50 P/PC (NTSC) uses a different chipset than DMR-EH50 EB/EG/EP (PAL)
• DMR-E55 EBL (Ireland) may differ from DMR-E55 EB/EG/EP

The DMR-ES10 appears to be the most consistent across regional variants — no chipset aliases have been identified for it.

This means that passthrough TBC performance benchmarks established for one regional variant may not apply to another, even under the same model number.

Recommended passthrough settings (NTSC)

The following settings are recommended for optimal passthrough TBC performance on NTSC units, based on extensive community testing:

Output connection: Use S-Video output to the capture device. Composite (CVBS) output should never be used as it produces inferior results. Component (YPbPr) output is also acceptable if the capture device supports it. On models with HDMI, this provides the cleanest digital path and avoids an additional D/A/A/D conversion.

Black Level Control (Setup → Video): Set Input Level to Lighter and Output Level (Composite/S-Video) to Darker. Every other combination causes banding artifacts, and Darker–Darker also crushes dark detail. While Lighter–Lighter may appear to reveal more shadow detail, this is inaccurate compared to reference levels and can be replicated in post-processing if desired.

Line-In NR (switch to a line/AV input, then Display → Video): Set to Off to disable the noise reduction filter, which can introduce unwanted temporal smoothing.

Blue Background (Setup → Display): Set to Off to show very weak signals and unrecorded tape portions as-is rather than replacing them with a blue screen.

Off Timer (Setup → Setup): Set to Off to prevent the unit from automatically powering down after 6 hours of inactivity.

Recording mode: Some users report that setting the recording mode to XP produces a sharper passthrough signal than lower-quality modes, although this is debated and may depend on the specific unit and VCR combination.

HDMI vs S-Video passthrough

Models with HDMI output (DMR-ES25, DMR-EH55, DMR-EH56, and later units) offer a choice between analog (S-Video/component) and digital (HDMI) passthrough paths.

S-Video path: The internal digital signal is converted back to analog for output. This introduces a D/A conversion, and the subsequent capture device must perform its own A/D conversion. Potentially lossy, but well-understood and widely used.

HDMI path: The capture device receives the exact digital signal produced by the DMR's internal processing, with no additional analog conversion steps. This is theoretically cleaner, but requires an HDMI capture device and the output is the unit's processed digital signal (which may include any colorspace compression or other processing artifacts inherent to the model).

The tradeoff is that the ES10 — which has no HDMI — provides the strongest TBC correction, while HDMI-equipped models offer a cleaner digital output path but with slightly less aggressive correction. Users must choose between these priorities based on the condition of their source material.

Common known issues

Power supply capacitor failure

Many Panasonic DVD recorders from the mid-2000s are prone to electrolytic capacitor failure in the power supply, with caps bulging and leaking over time. This is particularly common in PAL models. Symptoms include failure to power on, intermittent shutdowns, or degraded performance. The capacitors can typically be replaced with a standard soldering iron and are a common repair documented across the community.

HDD power saving on-screen message

Models with built-in hard drives (the DMR-EH series) display an intrusive "The HDD is going into power saving mode" on-screen message after 10–30 minutes of idle operation. Since the passthrough output includes the OSD, this message will be burned into any ongoing capture. Workarounds include:

• Inserting a blank disc before beginning capture
• Recording garbage to the HDD during capture (press record on the DMR)
• Waiting approximately 30 minutes after power-on before beginning capture, allowing the message to appear and clear before starting

Note that for passthrough TBC use, the DVD drive and HDD do not need to be functional — only the video processing circuitry matters. Units with dead drives can often be found cheaply and still serve perfectly well as passthrough TBCs.

Left edge cropping

The passthrough TBC processing crops approximately 5 pixels from the left edge of the image. This is unavoidable when using these units and should be accounted for in post-processing.

Luma/exposure level shifts

Panasonic DVD recorders are known to alter luma levels in passthrough, with the output not perfectly matching the input. This is a consistent issue across all models in the series, not specific to any one unit. The recommended Black Level Control settings (Lighter input / Darker output) mitigate this but do not eliminate it entirely.

Anti-copy sensitivity

The line TBC in these units is sensitive to Macrovision and other anti-copy signals, including false positives on tapes that do not actually have copy protection. This can manifest as brightness fluctuations or picture instability. It is a fundamental limitation of the line TBC design in these units.

Interaction with VCR built-in TBC

Some S-VHS VCRs (such as the Panasonic NV-FS200) have their own built-in line TBC. When using such a VCR with a Panasonic DMR in the chain, it is worth testing both configurations — VCR TBC enabled and disabled — as using both simultaneously can sometimes produce worse results (such as vertical field jitter) than using only one. Some experienced users prefer to disable the VCR's internal TBC when a Panasonic DMR is in the chain, letting the DMR handle all correction.

All DMR series models on this wiki

Model	Type	Year	Video Processing IC	HDD	HDMI	Passthrough TBC tier
Panasonic DMR-E10	DVD recorder	2001	MN673793	No	No	—
Panasonic DMR-E20	DVD recorder	2002	MN673794	No	No	—
Panasonic DMR-E30	DVD recorder	2003	MN673744	No	No	—
Panasonic DMR-E50	DVD recorder	2002	MN673744	No	No	—
Panasonic DMR-E55	DVD recorder	2004	MN85573	No	No	Tier 2
Panasonic DMR-E60	DVD recorder	2003	MN673744	No	No	—
Panasonic DMR-E80	DVD recorder	2003	MN673744	No	No	—
Panasonic DMR-E85	DVD recorder	2004	MN85573	No	No	—
Panasonic DMR-ES10	DVD recorder	2004	Unknown†	No	No	Tier 1
Panasonic DMR-ES15	DVD recorder	2005	Unknown†	No	No	Tier 1.5
Panasonic DMR-ES25	DVD recorder	2006	Unknown†	No	Yes	Tier 1.5
Panasonic DMR-EH50	DVD/HDD recorder	2005	Unknown†	80GB	No	Tier 1 (PAL) / Unknown (NTSC)
Panasonic DMR-EH55	DVD/HDD recorder	2006	Unknown†	200GB	Yes	Tier 1.5
Panasonic DMR-HS2	DVD/HDD recorder	2002	MN673744	Yes	No	—
Panasonic DMR-T2020	DVD recorder	—	MN673794	No	No	—
Panasonic DMR-T3030	DVD recorder	2002	MN673744	No	No	—
Panasonic DMR-T3040	DVD recorder	2002	MN673744	No	No	—

^† Panasonic's service manuals for the ES-series and EH-series do not include schematics for the digital processing PCB, so the specific video processing IC part numbers remain undocumented. The ES10's digital board is designated VEP79104B (EC-S variant) / VEP79104A (P/US variant).

"—" in the Passthrough TBC tier column indicates that the model has not been tested or documented for passthrough TBC performance.

See also

• Panasonic DMR-ES10 — The most detailed individual model page, including full recommended settings
• Panasonic AG-1980P — Professional S-VHS deck with built-in TBC, often used alongside DMR units
• Panasonic WJ-GXE900 — MPEG-2 network encoder that also uses the MN673794 video processing IC