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AV and Multimedia Related Thread, Convert avi to flv in Technical; I've run into a little problem with Riva Encoder in that it seems to be cutting off the 1st second ...
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    SimpleSi's Avatar
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    Convert avi to flv

    I've run into a little problem with Riva Encoder in that it seems to be cutting off the 1st second or so from avi's it converts to flv.

    This wouldn't normally matter but I've been working with some Year 6s doing some short "shorts" and its makes a big difference on a 9 second clip

    St Leonard's CE

    Anyone had this problem/overcome it or can suggest another free encoder that they use (no google responses please )

    I can workaround the problem by duplicating the 1st frame but its a bit of a faff

    regards

    Simon

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    SteveBentley's Avatar
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    I've found Super pretty good for transcoding video, it can handle flv as well

    SUPER

    (scroll right to the bottom to get the download link, not the AVS banner ad at the top of the page!)

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    SimpleSi's Avatar
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    I've always avoided SUPER on the basis of the look of the website

    Maybe I'll just have to bite the bullet (if I can actually find the download link on it )

    Simon

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    ChrisH's Avatar
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    The site sends you in a loop if you are behind a proxy. d/l @ home

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    SimpleSi's Avatar
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    I managed to download it and it did the job but the prog interface makes the website look good

    I'll think'll I'll just try to automate repeating the first frame for a second or so

    regards

    Simon

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    Cache's Avatar
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    WinFF is what I'm using to convert all videos at the moment, especially the pesky ones that powerpoint is extremely picky on. WinFF - Free Video Converter

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    SimpleSi (29th April 2010)

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    Super is just a "friendly" front end to a bunch of open source programs (the company is completely open about this) so what you can do is use Super to start the conversion and then run Sysinternals Process Explorer. You can then see the actual process which is doing the conversion and just run it directly next time you need a conversion.

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    Stick 5 seconds or so of black on the front and end using your video editor and then make a new avi. Teach the kids to let the camera roll before and after the action.

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    SimpleSi's Avatar
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    Stick 5 seconds or so of black on the front and end using your video editor
    Video Editor???? = you mistake my school as one with money to burn

    I ended up using Super and also used Avisynth to repeat the first and last frames for a few secs as it makes for better viewing anyway.

    Wouldn't mind a prog that extracts 1st frame to jpeg without haviung to trim the video as you need one to show as the still image on the flash player.

    regards

    Simon

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    Steven_Cleaver's Avatar
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    Free Conversion software

    Hi

    Try Format Factory its free & converts almost all video formats that I have found as well as images and Audio.

    Format Factory - Free media file format converter

    Steve

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    Quote Originally Posted by SimpleSi View Post
    Wouldn't mind a prog that extracts 1st frame to jpeg without having to trim the video as you need one to show as the still image on the flash player.
    ffmpeg can create thumbnails of videos. e.g.

    Code:
    ffmpeg -ss 10 -y -i input.avi -f image2 -vframes 1 -an thumb.jpg

    This takes a video file (-i input.avi) and extracts a single frame (-vframes 1) at an offset of 10 seconds (-ss 10) and saves it as thumb.jpg. If you want the thumbnail in PNG format, just change the extension of the image in the command above.

    If you need the thumbnails to be a particular size, add -s 720x576 to the command line above changing the width and height as necessary. If you leave this out (as I have done above), ffmpeg will determine the correct resolution to use based on the input video.
    Last edited by Arthur; 9th June 2010 at 03:51 AM.

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    SimpleSi (9th June 2010)

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    I forgot to mention that if you have a folder full of AVIs you want to capture frames of, the batch file below will make this process a lot easier. Just place it in the same folder as the videos and it will create thumbnails for each one it finds with the same name as the video.


    CreateThumbs.cmd
    Code:
    @echo off
    for %%a in (*.avi) do ffmpeg -ss 10 -y -i "%%a" -f image2 -vframes 1 -an "%%~na.png"
    Last edited by Arthur; 9th June 2010 at 09:35 AM.

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    danrhodes's Avatar
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    +1 for AVC Free. :-)

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    "Simon: I've been working with some Year 6s doing some short "shorts" and its makes a big difference on a 9 second clip "

    at least Arthur knows class using a current ffmpeg :grin: but alas its missing some cutting edge x264 patchs options but still a fine cli app to use until DS and the dev's get their audio, TS container muxing, and filter code re-factored in this goggle summer of code....

    but really STAY AWAY From SUPER Really just stay away , Never tell others to use it, and Never look back, it's codebase is full of Old 3rd party code and will Not produce visual quality and/or smaller files compared to using the original and current 3d party Free SW instead....

    right , basics: there are 3 main parts to any current digital video, these are the video codec used, the audio codec used and the container you put them in......

    .flv is a container,as is .AVI , and Why do you want to use the .flv container anyway Simon ?, .mp4 or .mkv are the containers of choice Today ?

    if you really Need/Want a GUI based video Transcoding and editing app then the cross platform AVIDemux is all you really need and the kids can use it very effectively after a short time learning, and even if you don't need a GUI then still use AVIDemux as it has the cutting edge highest visual quality x264 AVC/H.264 codec Encoder codebase compiled for it regularly and highest visual quality should always be your Number one thing to do....

    Ohh, and its included video filters for de-noising ,resizing ,and slight sharpening are very handy too, as are the others if you have need of them, but those 3 are the main parts i use for creating, basic editing, and keeping higher quality input content as good as you can.

    right you can get the most current windows version here Avidemux Builds for Microsoft Windows right now that's Revision 6370 and perhaps using Mulder's most current x264 compiles you simply unpack and place in the top dir of wherever you placed and run AVIDemux
    libx264 GIT builds (Page 8) - Windows - Avidemux2 Forum

    here's the other OS links http://fixounet.free.fr/avidemux/download.html i cant speak for these as i don't know of any dev's compiling current cutting edge x264 patchs for these other OS, but they may exist if you ask on the board

    you should also perhaps download and start using the cross platform MediaInfo as that is VERY useful to inform you of what codecs, resolution ratio's, and even Encoding options were used on a given video file.
    http://en.wikipedia.org/wiki/List_of_common_resolutions

    My recommendation unless you have a VERY GOOD Reason not to, is converting all your old antiquated AVI container video to Mp4 containers, Always use AVC crf=21 or 18 for transparency to the original, AAC
    or Mp3 if you must for audio and be happy at the visual quality and far smaller file-size and bitrate for a given content, Now you might stand a chance of streaming that converted AVC "high profile" high quality 1920×1080 16:9 ratio HD video over your antiquated wireless 11b (USB card you thought you would never be able to re-use again for HD video) LAN section at 3Mbit/s
    Last edited by pip99; 17th June 2010 at 04:27 AM.



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