Lossless trimming of source material - problem with Canon HG21

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Solved by

Mar 30, 2012 07:11

I am recording myself playing the piano and unfortunately not good enough at it. I need to throw away about 99% of the source material. I tend to record for hours at a time and keep only a few minutes typically.
I am recording AVCHD at 24 mbps from 2 HD camcorders :
1) cheap new JVC GZ-E10
2) expensive old Canon HG21

I have no problem doing lossless trim from the JVC.
I was able to trim the 400MB I needed from a 3.6GB file in under 30s using SVRT and AVCHD 1920x1080 24 mbps profile.

However, not so with the Canon source files.

Trimming the same data with SVRT takes 8 minutes ! This is only 2 mins of source material. So clearly Powerdirector is re-encoding... If I use the hardware encoder (I have an nVidia 9800GT) it actually takes only 3 minutes.
This is on Win7 64 bit with 16GB RAM, on Intel Core 2 quad Q6600 2.4 GHz.

Any clue what could be going on ?
I don't want to do a lossy recompression.
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)

Carl312

Senior Contributor Location: Texas, USA Joined: Mar 16, 2010 20:11 Messages: 9090 Offline

Mar 30, 2012 10:05

Quote: I am recording myself playing the piano and unfortunately not good enough at it. I need to throw away about 99% of the source material. I tend to record for hours at a time and keep only a few minutes typically.
I am recording AVCHD at 24 mbps from 2 HD camcorders :
1) cheap new JVC GZ-E10
2) expensive old Canon HG21

I have no problem doing lossless trim from the JVC.
I was able to trim the 400MB I needed from a 3.6GB file in under 30s using SVRT and AVCHD 1920x1080 24 mbps profile.

However, not so with the Canon source files.

Trimming the same data with SVRT takes 8 minutes ! This is only 2 mins of source material. So clearly Powerdirector is re-encoding... If I use the hardware encoder (I have an nVidia 9800GT) it actually takes only 3 minutes.
This is on Win7 64 bit with 16GB RAM, on Intel Core 2 quad Q6600 2.4 GHz.

Any clue what could be going on ?
I don't want to do a lossy recompression.

Post your computer specs.

Part A and Part B
http://forum.cyberlink.com/forum/posts/list/7958.page

I suspect that your computer is not up to the task of handling the Canon HD video.
Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.

JL_JL

Senior Contributor Location: Arizona, USA Joined: Oct 01, 2006 20:01 Messages: 6091 Offline

Mar 30, 2012 10:53

Quote: Trimming the same data with SVRT takes 8 minutes ! This is only 2 mins of source material. So clearly Powerdirector is re-encoding... If I use the hardware encoder (I have an nVidia 9800GT) it actually takes only 3 minutes.

You need to go to preferences and select "Allow SVRT on single IDR H.264 video" for SVRT to be used on most Canon footage. If not selected, PD will encode. Also be sure to select correct 24Mbps profile when producing.

Jeff

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 30, 2012 18:09

Quote:
Post your computer specs.

I posted most of the relevant specs above in the initial message (CPU, RAM, OS, video card).
The source video files are on SATA RAID 1 stripped array 2x2TB .
Target is on SATA SSD.

I suspect that your computer is not up to the task of handling the Canon HD video.

Even if that is the case, the problem is that a new encoding is happening at all - it should not be.
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 30, 2012 18:11

Jeff,

Quote:

Quote: Trimming the same data with SVRT takes 8 minutes ! This is only 2 mins of source material. So clearly Powerdirector is re-encoding... If I use the hardware encoder (I have an nVidia 9800GT) it actually takes only 3 minutes.

You need to go to preferences and select "Allow SVRT on single IDR H.264 video" for SVRT to be used on most Canon footage. If not selected, PD will encode. Also be sure to select correct 24Mbps profile when producing.

Jeff

Thanks, I will try that setting when I get home tonight. I was already using the correct 24 Mbps profile.
Why isn't this "allow SVRT on single IDR H.264 video" option the default ?
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)

Julien Pierre

Contributor Joined: Apr 14, 2011 01:34 Messages: 476 Offline

Mar 31, 2012 03:16

Thanks, that option fixed it - performance is now as expected when I trim the HG21 content.
MSI X99A Raider
Intel i7-5820k @ 4.4 GHz
32GB DDR4 RAM
Gigabyte nVidia GTX 960 4GB
480 GB Patriot Ignite SSD (boot)
2 x 480 GB Sandisk Ultra II SSD (striped)
6 x 1 TB Samsung 860 SSD (striped)

2 x LG 32UD59-B 32" 4K
Asus PB238 23" HD (portrait)