Ubuntu Multimedia :: Re-encode Old Videos With Open Codec Without Quality Loss?
May 24, 2010
I have a lot of old video footage around that, I am ashamed to say, I encoded with heavily proprietary codecs like DivX and such during the dark ages (aka. the Windows Times).
Now, I would like to redeem myself from the mistakes of my past by re-encoding everything into open formats.
Since those videos are often not of the best quality (poor camera, poor codecs, poor knowledge), I do not want to loose more quality in the process.
So, to avoid any more mistakes in the future, I would be glad if someone could answer me some of the following questions:
1. Is it even possible to re-encode those movies into something like x264/vp8/theora without loosing any more quality?
2. What tools should I use for that? Command line is actually preferred.
3. What would be the most desirable format to have? I'm thinking about x264 in Martroska with ogg Auto. Is there anything better suited?
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Mar 18, 2011
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Nov 23, 2010
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Jun 30, 2011
Anyway to rip the audio from an flv and convert to flac or mp3 without quality loss?
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Feb 24, 2010
I am trying to use ffmpeg to split a number of videos of different types (WMV, MPG, AVI). I do not want to change anything else, just split them into smaller chunks. The video is split, but the quality of the output file is terrible. I would describe it as "blocky" (I think the correct term is "pixelated"). When I make the player (KMPlayer) much smaller the problem naturally goes away.
The command I am using:
ffmpeg -i original_vid.wmv -ss 00:00:00 -t 00:05:00 first_vid.wmv
The output:
FFmpeg version SVN-r19352-4:0.5+svn20090706-2ubuntu2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration: --extra-version=4:0.5+svn20090706-2ubuntu2 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis
[Code]....
"Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 25.00 (25/1)
Seems to mean something, but I couldn't find anything saying that this is the problem or what O should do to correct it.
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May 17, 2015
i am trying to rotate some mp4 videos taken from my mobile phone. i do need to rotate them by 90 degrees.i have tried mencoder VIDEO0029.mp4 -o output.mp4 -vf rotate=1 -oac pcm copy -ovc lavc but it drops the quality A LOT.is there a way to rotate the videos but preserve the quality?
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Feb 27, 2011
i got the weirdest flash player problem on the planet. so, here's what the problem is. whenever i play low quality 360p flash videos in fullscreen in firefox, i get horrible performance and it eats up all the cpu resources, as compared to 1080p fullscreen video, which is smoooooooth and doesn't take up as many resources as low quality videos. why is that? i am using flash 10.2 beta 64 bit and have 64 bit ubuntu, but the problem persisted even on the stock flash player.
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Jul 20, 2010
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Apr 7, 2010
I just got my hands on an MSI E7235-295US and slapped Ubuntu 9.10 on it. So far everything's worked great, but I am beginning to get a bit concerned about my sound quality. The laptop itself has 5 speakers + subwoofer so I should be getting 5.1 sound, if I understand things correctly (the newegg link should provide more details) and when I play anything (music, flash, videos, games, etc...) the sound comes out 'muffled'. Almost as if it is in a concert hall, maybe. I initially wondered if the problem is related to the 5 speakers and if the sound is initially only setup for two. If that is the case, nothing I've done has seemed to made any real difference. I've tried changing the master/pci channels, but it only hides it a little, and doesn't solve the problem.
This seemed to be on the right track, but the laptop is still really new and not listed in the alsa file.
Some info:
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
Subsystem: Micro-Star International Co., Ltd. Device 7220
Flags: bus master, fast devsel, latency 0, IRQ 22
Memory at f8ef8000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
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Feb 26, 2010
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Jan 18, 2011
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Apr 25, 2009
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Feb 11, 2011
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Jan 26, 2010
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Jun 3, 2011
There's so little documentation for GLC that it's nearly impossible to get it working. I just tried encoding a file I made using the script provided, and got this output:
Code:
joseph@joseph:~/Desktop$ sh encode.sh lugaru-17880-0.glc
[: 103: lugaru-17880-0.glc: unexpected operator
[code]....
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May 16, 2010
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[Code]...
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Feb 2, 2010
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Nov 28, 2010
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Oct 13, 2010
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May 25, 2011
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Feb 17, 2011
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Sep 26, 2010
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Jan 22, 2011
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Jan 17, 2010
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What? No h.264 option in Ekiga. That's weird, especially considering they have supported it since 3.0 and I'm using the version in the Karmic repos, 3.2.5. Not free, ok, I'll just install it then, right?
x264 package didn't do it. A little ffmpeg install as well. libavcodec52, which uninstalled a buttload of other stuff also. Even dl'd and installed libopal3.6.4-plugins-non-free. All to no option for the h.264 codec option in Ekiga.
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All I have in the video codecs is theora and h261.
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Jun 1, 2010
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Jun 3, 2010
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Jun 20, 2010
I am running Ubuntu 9.10 64 bit version. Want to capture a short audio stream from a DVD.
VLC has a command "Open Capture Device" that gives the user options for ripping (I think) the audio tracks. I made the relevant choices and got this message:
Streaming / Transcoding failed:
It seems your FFMPEG (libavcodec) installation lacks the following encoder:
MPEG AAC Audio.
If you don't know how to fix this, ask for support from your distribution.
This is not an error inside VLC media player.
Do not contact the VideoLAN project about this issue.
What is to be done?
I went to synaptic package manager and I have FFMPEG, libavcodec, and AAC installed.
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Dec 25, 2010
I was having trouble opening videos my friends sent through Facebook. It said I need Flash Player upgraded. However, I was able to open videos on utube
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sudo apt-get remove flash plugin-nonfree
i did that, and now i can't open utube videos, and the other FB videos still don't open.
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Jan 6, 2011
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Mar 6, 2011
This may be a minor irritation, but I'm puzzled by it nonetheless. I'm ripping my CDs to MP3 using Sound Juicer with the lamemp3enc plugin and following gstreamer pipeline.
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All was great a couple days ago, but suddenly the files' audio properties show 48 kbps bitrate when it should be well over 200. I even changed the pipeline to use "target=1 bitrate=256" with the same result. The files are being encoded as expected and that is reflected in the file size and the Statistics view in VLC.
I have two computers running Ubuntu 10.10. One has all the latest updates, but the other has not been updated in several days. This problem is happening on the former, but not the latter. gst-inspect lamemp3enc shows both computers have the same version of the encoder.
I thought I'd put it out to the forum here before submitting a bug in launchpad.
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