• AVI-files with Digital Video streams can be decoded with
  • libdv (default)
  • ffmpeg (-x ffmpeg)
• concatenating clips with directory mode and option "-i direname" before processing.
• a couple of fast or high-quality de-interlace filters available to enhance the quality.
• support for encoding to DV with libdv as raw stream or interleaved AVI-file.
• pass-through mode: raw DV -> AVI-file conversion.

• Digital Video DV
  • AVI files
  • DV streams

• pass-through mode

• de-interlacing guide

• anti-aliasing guide

• You need Arne Schirmacher's nice tool dvgrab to transfer the DV tape to disk. Make sure, you use the "--format dv2" option and maybe "--autosplit" to split the tape into small pieces. Use AVI files, since libdv sound seems to be broken. Optionally, use
  
  tcprobe -i  file.avi
  
  to find out important parameters: For example:

  [tcprobe] RIFF data, AVI video [avilib] V: 25.000 fps, codec=dvsd, frames=633, width=720, height=576
[avilib] A: 48000 Hz, format=0x01, bits=16, channels=2, bitrate=1536 kbps,
[avilib] 633 chunks, 4861528 bytes
[tcprobe] summary for test-2002.10.04_14-47-25.avi, (*) = not default, 0 = not detected
import frame size: -g 720x576 [720x576]
frame rate: -f 25.000 [25.000] frc=3
audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x1 [0x2000] (*) bitrate=1536 kbps
length: 633 frames, frame_time=40 msec


  Fortunately, the auto-probing feature of transcode takes care of these details.
  
  

• To encode the clips, we have a number of options:
  • writing a shell script, that feeds transcode with each file,
  • using avimerge to create a single input file,
  • using the directory mode with option "-i". This works only in connection with the import module import_dv.so.

  AVI-file

  Here, we use a single AVI-file file.avi with "dvsd" codec as an example:

  transcode	-i file.avi -x dv,avi
  	-I 1 -C 1 -z -k
  	-o file-divxmp3.avi -y divx4

  
  We use import_avi.so to extract the audio, which works flawless. Note that the audio is found in two places in the AVI-file. Firstly, interleaved in the DV video frame and secondly, the PCM audio track itself. This makes it possible to use the import module "dv" for audio extraction as long libdv is broken.
  Note: some non-dvgrab produced AVI-files may have the audio ripped from the DV frames. In this case, you must use "-x dv,avi" or "-x dv,X", were X is one of (raw,mp3,ac3).
  You can also reduce the picture to a quarter size "-r 2" to get rid of the interlace artifacts and don't need the de-interlace option "-I 1". This option is the fastes de-interlacing available, but is a simple interpolation. You might also want to try out the anti-aliasing feature with "-C 1" to process the whole frame but this is slow. The option "-z -k" flips the frame and make the necessary color space changes for the encoder.

  DV stream

  Put all AVI-files or raw DV stream into a subdirectory, e.g., named "tape/".

  transcode	-i tape/
  	-I 3 -C 2 -z -k
  	-o tape-divxmp3.avi -y divx4

  
  The necessary import module is autodetected. tccat extracts the video stream of all AVI-files and concatenates them together to make the clips appear as a single DV stream for transcode. Here, the de-interlace option "-I 3", which drops one half-frame and interpolates by zooming to full frame size and, in principle, removes the interlace artifacts. We also try the anti-aliasing feature with "-C 2" to process the full frame afterwards, but this is slow.

• Well, that's it. Use avimerge to glue the matching clips together and burn the resulting file to CD.

transcode -i raw.dv -P 1 -o raw.avi -y raw

The opposite way is achieved by:

tcextract -i raw.avi -x raw > raw.dv