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| AEN007 |
| Posted: Jan 27 2009, 12:18 PM |
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Advanced Member
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Posts: 90
Member No.: 24508
Joined: 10-November 08
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27Jan2009
Greetings.
I have yet to find an instance where
I could use Smart Rendering.
Could/Would someone clarify
exactly when one could use Smart Rendering?
Any replies/insights appreciated.
Thank you.
Regards,
AEN
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| Placio74 |
| Posted: Jan 27 2009, 12:44 PM |
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VideoAudio
Group: Members
Posts: 1216
Member No.: 21485
Joined: 24-May 07
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- Full processing mode
- Smart rendering
- Compression - select same codec that was encoded video
Smart rendering is useful if don't want re-encode entire video, but only required part.
For example...
- if want to cut video outside keyframes - only certain frames are re-encoded
- if want to apply a some filter on fragment (using Curve editor), but don't want re-encode rest
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VideoAudio.pl - Serwis o technologii wideo & audio |
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| AEN007 |
| Posted: Jan 9 2011, 07:33 PM |
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Advanced Member
Group: Members
Posts: 90
Member No.: 24508
Joined: 10-November 08
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9Jan2011
Greetings.
I recently found some (unofficial/bootleg/not copyrighted) Grateful Dead concert videos at YouTube. Usually each song is a separate video. For songs in the first set, that is irrelevant; but second set songs usually flow right into the next song. Each song as a separate video is a problem with such second set songs because
the songs are not cut well. A song/video ends with the beginning of the next song - which begins with part of the end of the previous song.
The software I use for downloading gives 3 or 4 options - usually 2 or 3 flv options (low, medium or high quality) and one high quality mp4 option. My first question concerns these options. Is flv (at any/which quality?) always better than the mp4 option? YouTube uses flash, so it seems to me downloading flv would be better than mp4 - less transcoding video quality loss?
I can open individual flv files in VDub with the DirectShow plugin and also the entire set as one file by stringing together each video in an avs file; however, VDub will not properly playback these flv files. CPU usage goes to 100% and corrupts the playback.
My second question: are there any VDub or Dshow settings I could tweak, so VDub would playback these flv files? I cannot edit out the second set song redundancies before having VDub generate an avi file because VDub will not properly playback the flv/avs inputs. I cannot pick frames to edit out.
I discovered Avidemux SmartCopy and then realized that VDub Smart Rendering was the same thing. I can edit the avi output to remove the second set song redundancies and save using Smart Rendering (editing outside keyframes). I encode originally using DivX multipass. When I use Smart Rendering, how should I set compression?
| QUOTE | | - Compression - select same codec that was encoded video |
Do I choose the same codec with multipass or 1-pass?
Since VDub will only re-encode a few of the frames, could/should I choose a higher bitrate to compensate for quality loss? |
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| ale5000 |
| Posted: Jan 10 2011, 04:26 AM |
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Advanced Member
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| QUOTE (AEN007 @ Jan 9 2011, 07:33 PM) | | I can open individual flv files in VDub with the DirectShow plugin and also the entire set as one file by stringing together each video in an avs file |
For .flv files you get better results with the FLV input plugin ( http://fcchandler.home.comcast.net/~fcchan.../FLV/index.html ) compared to the DirectShow plugin.
To merge files, you can "Direct stream copy" all of them (separately) to .avi and then you can merge them with File => "Append AVI segment...".
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| Placio74 |
| Posted: Jan 10 2011, 10:13 AM |
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VideoAudio
Group: Members
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| QUOTE (AEN007 @ Jan 9 2011, 09:33 PM) | | ... Is flv (at any/which quality?) always better than the mp4 option? YouTube uses flash, so it seems to me downloading flv would be better than mp4 - less transcoding video quality loss?... |
Adobe Flash Player supports both, FLV and MP4.
Use MediaInfo and compare video files properties.
YouTube uses MP4 format for HD vids and old HQ. 'New' HQ ('format' 35) may be of better quality (possible higher bitrate and resolution) than old HQ ('format' 18).
| QUOTE (AEN007 @ Jan 9 2011, 09:33 PM) | | ... I encode originally using DivX multipass. When I use Smart Rendering, how should I set compression?... |
Multi-pass mode must be disabled (for Smart rendering mode). Look at help file (.chm in VD folder) and read about Smart rendering.
| QUOTE (AEN007 @ Jan 9 2011, 09:33 PM) | | ... Since VDub will only re-encode a few of the frames, could/should I choose a higher bitrate to compensate for quality loss?... |
Default setting should be sufficient. You can try with 'small' target quantizer (quality-based mode) - 4 or 2.
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VideoAudio.pl - Serwis o technologii wideo & audio |
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| AEN007 |
| Posted: Jan 10 2011, 12:05 PM |
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Advanced Member
Group: Members
Posts: 90
Member No.: 24508
Joined: 10-November 08
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10Jan2011
Greetings.
Thanks for the replies.
I have/had already compared mp4 vs flv downloads with MediaInfo.
My question about transcoding video quality loss remains.
The GD YouTube videos are not HD.
It seems to me a transcoded download with high quality specs
might be lower quality than a non-transcoded download with lower quality specs ...
My guess is that the mp4 download files are transcoded and the flv files are not ...???
I already have/had the FLV input plugin but always receive the error message
"... has no video stream". According to the following posting here»
http://forum.videohelp.com/threads/309827-...-read-FLV-Files
| QUOTE | 7th Sep 2009 10:17 #6
mgh
mgh is offline
Member
Join Date: Jan 2003
Location: India
virtualdub does not open flv streams with avc and aac.
Use the directshow plugin for that. |
VDub will not open these YT flv downloads because they have aac audio.
VDub can Direct Stream Copy flv to avi with no quality loss?
Maybe that would be a solution ... if I could play the avi videos in VDub
and edit out the song redundancies. I'm not sure about this aac audio yet ...
Any replies/insights appreciated.
Thank you.
Regards,
AEN
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| Placio74 |
| Posted: Jan 10 2011, 01:24 PM |
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VideoAudio
Group: Members
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| QUOTE (AEN007 @ Jan 10 2011, 02:05 PM) | | ... My guess is that the mp4 download files are transcoded and the flv files are not ...???... |
Both are transcoded (just with other parameters).
When upload to YouTube, videos are always transcoded.
| QUOTE (AEN007 @ Jan 10 2011, 02:05 PM) | ... I already have/had the FLV input plugin but always receive the error message ...
... VDub will not open these YT flv downloads because they have aac audio. |
Try new fccHandler's plugin (is different than older plugin created by Moitah), has indicated ale5000.
New plugin support FLV's with AVC/AAC. Can't transcode AAC audio (there is no ACM codec for AAC audio), however can copy (in Direct stream mode).
Again... currently there are two different FLV input plugins.
| QUOTE (AEN007 @ Jan 10 2011, 02:05 PM) | | ... VDub can Direct Stream Copy flv to avi with no quality loss? |
Of course.
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VideoAudio.pl - Serwis o technologii wideo & audio |
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| AEN007 |
| Posted: Jan 10 2011, 03:01 PM |
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Advanced Member
Group: Members
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Member No.: 24508
Joined: 10-November 08
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10Jan2011
Just a quick, intermediate posting.
This flv editing is annoying me, but I don't want to make annoying posts. Anyway, the fccH flv plugin does open these YT flv downloads (THANK YOU), but VDub gives the following message when I try playback»| QUOTE | No audio decompressor could be found to decompress the source audio format.
(source format tag: 00ff) |
I have the latest ffdshow tryouts ßeta installed and aac enabled and so don't know what the problem is. I don't have all my laptops with me at the moment and so don't know if this problem is specific to this machine. VDub gives the same error message after I DSC the flv to avi/aac. Opening these flv files with the DSplugin or avs script does not result in this error message - just the 100% CPU usage playback corruption problem.
YT transcodes files uploaded to YT - but to what format/specs I do not know. My point/question is - can one pick a download format that will not require another round of transcoding? |
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| Placio74 |
| Posted: Jan 10 2011, 03:30 PM |
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VideoAudio
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Posts: 1216
Member No.: 21485
Joined: 24-May 07
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| QUOTE (AEN007 @ Jan 10 2011, 05:01 PM) | | ... Anyway, the fccH flv plugin does open these YT flv downloads (THANK YOU), but VDub gives the following message when I try playback... |
Playback (as well as transcoding) AAC audio is not possible - ACM codec for AAC is required, but there is no such (does not exist).
| QUOTE (AEN007 @ Jan 10 2011, 05:01 PM) | | ... I have the latest ffdshow tryouts ßeta installed and aac enabled ... |
Irrelevant.
ffdshow it's only video and audio DirectShow filters/decoders and VfW codec.
fccHandler's FLV plugin uses ACM codecs for audio decoding (such as VirtualDub) - ffdshow not contain ACM codec.
| QUOTE (AEN007 @ Jan 10 2011, 05:01 PM) | | ... VDub gives the same error message after I DSC the flv to avi/aac. Opening these flv files with the DSplugin or avs script does not result in this error message - just the 100% CPU usage playback corruption problem. ... |
Probably some issue with DirectShow filters.
What is installed OS and used DS filters for FLV (splitter and decoders)?
| QUOTE (AEN007 @ Jan 10 2011, 05:01 PM) | | ... My point/question is - can one pick a download format that will not require another round of transcoding? |
Unlikely (from YT are only available FLV, MP4 and WebM).
BTW
What if... chanage container from FLV (if contain AVC/AAC) to MP4?
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VideoAudio.pl - Serwis o technologii wideo & audio |
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| ale5000 |
| Posted: Jan 10 2011, 04:55 PM |
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Advanced Member
Group: Members
Posts: 1114
Member No.: 22180
Joined: 30-September 07
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To use the preview set Audio => "No audio", this will make the preview of the video working.
Make sure to re-enable the audio (with Audio => Source audio => Stream 1) before using "Save as AVI...".
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| AEN007 |
| Posted: Jan 10 2011, 08:52 PM |
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Advanced Member
Group: Members
Posts: 90
Member No.: 24508
Joined: 10-November 08
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10Jan2011
Greetings.
I was already aware I could disable the audio, but that doesn't do me any good when trying to edit out song redundancies...
I can play mp4 & flv in a normal video player with no CPU usage problems. As stated previously, I cannot play flv in VDub - no matter which plugin for flv nor when I use an avs file. I can open mp4 into VDub with the DShow plugin AND play the mp4 file in VDub with no CPU usage problem BUT cannot play mp4 files in VDub when I use an avs file (which doesn't do me any good when trying to edit out song redundancies...). I have no avs playback problems with mpg/mpeg/avi/wmv ...
I use VDub on two XPsp3 laptops (1 XPP & 1 XPH).
I do not have XPH with me at the moment.
FLV in ffdshow is libavcodec.
Splitter is flvSplitter 20090428 (1.0.0.5 I thnik ...)
For now my routine is
1) string together Set I / Set II flv files in an avs file & resize; maybe also crop ...
2) open the avs into VDubMod & export the audio track;
3) process audio/edit the audio track as necessary;
4) do DivX multipass in VDub 1.9.x with the avs & processed audio track;
5) do necessary edits & Smart Rendering;
6) Append the Set II & encore file to the Set I file ... |
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| ale5000 |
| Posted: Jan 10 2011, 10:17 PM |
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Advanced Member
Group: Members
Posts: 1114
Member No.: 22180
Joined: 30-September 07
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Until someone create an ACM codec for AAC you can't convert or play the aac audio in VirtualDub, so the only solution is extract audio, process in a different application then re-add it throgh Audio menu => Audio from other file
--------------------
New VirtualDub forum
VirtualDub AIO (All-in-One installer for VirtualDub and plugins)
Codec Toolbox RS (A tool to read/change merit of codecs and many other things)
Input plugins for VirtualDub / ACM codecs / VFW codecs |
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| AEN007 |
| Posted: Jan 11 2011, 10:20 AM |
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Advanced Member
Group: Members
Posts: 90
Member No.: 24508
Joined: 10-November 08
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11Jan2011| QUOTE (AEN007 @ Jan 10 2011, 08:52 PM) | I was already aware I could disable the audio, but that doesn't do me any good when trying to edit out song redundancies...
For now my routine is
1) string together Set I / Set II flv files in an avs file & resize; maybe also crop ...
2) open the avs into VDubMod & export the audio track;
3) process audio/edit the audio track as necessary;
4) do DivX multipass in VDub 1.9.x with the avs & processed audio track;
5) do necessary edits & Smart Rendering;
6) Append the Set II & encore file to the Set I file ... |
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| AEN007 |
| Posted: Jan 24 2011, 06:48 PM |
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Advanced Member
Group: Members
Posts: 90
Member No.: 24508
Joined: 10-November 08
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| QUOTE (Placio74 @ Jan 10 2011, 10:13 AM) | | Use MediaInfo and compare video files properties. |
Dirk Paehl has a freeware collection of portable utilities -
including an MediaInfo alternative, which I have found gives some spec info the MI normally does give but does not seem to give on YT flv downloads (e.g., video bitrate)
The DPMI gui sucks ... but might be of use in some cases.
I tried to play in TMPEGenc & MPC/MPCHC avs files of linked flv or mp4 files - to no avail. The same 100% CPU usage problem occurs; however, MPC/HC does play the avs file audio smoothly ...
Sometimes one of the GD concerts at YT is missing a song from the concert. The audio is generally available elsewhere on the web. How do I create a video of say still images with the audio of the missing track to plug the gap? |
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| AEN007 |
| Posted: Jan 30 2011, 03:39 PM |
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Advanced Member
Group: Members
Posts: 90
Member No.: 24508
Joined: 10-November 08
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30Jan2011
Greetings.| QUOTE (AEN007 @ Jan 10 2011, 08:52 PM) | | I can play mp4 & flv in a normal video player with no CPU usage problems. As stated previously, I cannot play flv in VDub - no matter which plugin for flv nor when I use an avs file. I can open mp4 into VDub with the DShow plugin AND play the mp4 file in VDub with no CPU usage problem BUT cannot play mp4 files in VDub when I use an avs file (which doesn't do me any good when trying to edit out song redundancies...). I have no avs playback problems with mpg/mpeg/avi/wmv... |
I seem to have worked out the/a problem/solution to VDub playback of avs files of mp4 and flv files ... on my system in question anyway ...
Sometimes one of the GD concerts at YT is missing a song from the concert. The audio is generally available elsewhere on the web. How do I create a video of say still images with the audio of the missing track to plug the gap? |
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