Open Source Video

Transcriber

Transcriber is a simple but handy tool to transcribe audiofiles.
See homepage

Transcriber is a tool for assisting the manual annotation of speech signals. It provides a user-friendly graphical user interface for segmenting long duration speech recordings, transcribing them, and labeling speech turns, topic changes and acoustic conditions. It is more specifically designed for the annotation of broadcast news recordings, for creating corpora used in the development of automatic broadcast news transcription systems, but its features might be found useful in other areas of speech research.
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Mapping AV streams to DVD

I edited a film in Cinelerra, and rendered it as a QTfor Linux file, settings: Sound ‘two complements’ Video ‘DV’
The soundtrack was exported seperately as Wav files, with exactly the same length.
I wanted to replace the original sound with the soundtrack, and used ffmpeg to mux the files and convert them to a dvd compatible MPEG file at the same time.

ffmpeg -i '/path/A.mpg' -i '/path/B.wav' -target dvd '/path/C.mpg' -map 0:0 -map 1:0

A.mpg is the videofile, B.wav is the soundtrack. Using the -map option allows choosing which video- and audiostreams are used in the output file.
-map 0:0 means: inputfile 0 (the first in line in the command) should be used in outputfile 0 (the first outputfile in the command)
-map 1:0 means: inputfile 1 (second in line) to be used in outputfile 0.
This combinesA and B in one file, and ignores the audio of A.mpg

The -target dvd option applies standard values to the encoding, and guesses for Pal / NTSC based on the detected framerate. A simple way to fuse muxing and transcoding to dvd compatible mpeg.

video object in html

Today, you need to use plugins and proprietary formats to view videos in browsers. There is great demand for a better solution to serve video content to users. A native video format in browsers without all the licensing and patent issues that plague other format could be beneficial to all parties (perhaps except those who make a living licensing expensive proprietary technologies for such purposes).

Some bits about the progress in this field are pasted together in this post.
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FOSS Codecs for Online Video

FOSS Codecs for Online Video: Usability, Uptake and Development

An excellent overview of the best available tools for the creation, playback and embedding of online video using Free and Open Source Software video codecs, and a set of recommendations for development to enhance their adoption by social change video projects on the web.

Input was requested during the writing of the first draft, and further feedback and input received and amalgamated after circulating it to the Transmission and Theora discussion lists and to other interested individuals.

workshop Command Line Video Editing

In the framework of Verbindingen / Jonctions , Michael Murtaugh made a workshop editing video from the command line in Actic, Brussels. A cookshow full of text based visual magick, examples of small scripts and inverted use of player functionalities.

Look on Michaels wiki page which contains example code for encoding tools like ffmpeg and mencoder, and includes a quick reference to Mplayer with helpful basic commands and options.

Sending a stream (graphical interface) 2

Theorur is a GUI for Ogg/Theora streaming (icecast2 system), written using gtk2, under GLPv2, by Rafael Diniz, that needs:
– dvgrab
– ffmpeg2theora >= 0.17
– oggfwd >= 0.2

Video4linux

To look for instructions for how to get a certain card working, a report on the audio and video quality of a working card, check: http://www.video4linux.net/

Sending a stream (graphical interface) 1

Using Theora Streaming Studio.

The theora streaming studio is a graphical interface on top of the ffmpeg2theora software.

Sending a stream (command line)

Streaming with the command line:

$ dvgrab --format raw - | ffmpeg2theora -a0 -v5 -fdv -x320 -y240 -o /dev/stdout - | oggfwd 127.0.0.1 8000 hackme /tcvi.ogg

This translates as: take the raw input of the attached device (typically a digital camera), pass it to the program ffmpeg2theora that will create a video flux with a frame of 320×240. The result is then processed by oggfwd that sends is to an icecast server (in this case the local address 127.0.0.1 on port 8000 with password hackme on mountpoint tcvi.ogg)

Map Videoworkflow

This is the first scetch of a workflow map, version 05/07.

Here you can download an Inkscape SVG file. The layered file doesn’t show well in my browser (Firefox) but if you download it the file should be OK. This image goes with the talk ‘Affinity Video’ which can be found here.