Specifications

Stream Parameters

Detect / Resync Missing Frames: VideoReDo continually checks for missing or corrupt audio and

video frames. These frames may be a short and temporary annoyance when the program is played on back

in VideoReDo or other PC-based software players. However, many DVD authoring programs do not handle

these frames gracefully and they will create very noticeable audio and video synchronization problems on the

newly authored DVD.

VideoReDo continually checks the synchronization of the input file and will insert or remove audio or video

frames in an attempt to maintain output synchronization. Corrections behavior is controlled by this option.

Ignore: VideoReDo will not attempt to correct small synchronization errors. However if the synchronization

error is so severe that VideoReDo's internals buffers might overflow, then audio or video frames will be removed

to reestablish synchronization. This will occur if the synchronization error exceeds 4 seconds ( 8 seconds if

the

Double Video Buffer Memory Option is selected).

Resync - Insert Extra Video Frame: If the video starts to lags behind the audio, VideoReDo will insert

extra replicated frames into the GOP in order to maintain sync. This setting is useful when the source material

is digitized from old or noisy video tapes. Often these tapes create multiple video drop outs, yet the audio is

perfect. By inserting the extra frames into the output stream, the audio track as well as sync is preserved.

Note: The extra replicated frames can lengthen a GOP so that it is no longer DVD compliant. Although

most modern DVD players will handle longer than compliant GOPs you can use the

Maximum GOP Size

output option to have VideoReDo reduce the newly lengthened GOP back into compliance.

Resync - Remove Audio Frames: With this option, if the video lags behind the audio, VideoReDo

remove audio frames until the programs are back in sync.

Note: When the audio lags behind the video, VideoReDo's only option is to remove video frames. There is

no provision to insert additional audio frames.

Delta Frames: This parameter determines how much synchronization offset can be tolerated before

VideoReDo starts to resync the program. The default value of 3 starts making fixes when the audio and video

are out of sync by 3 frames, which is 100 msec for NTSC, or 120 msec for PAL. For 720p HD material,

audio durations are used which either either 24 or 32 msec/frame depending upon the way the audio is

encoded. Using a lower value will result in more frequent sync correction. This parameter is only a trigger of

when to start synchronization correction. Once the correction is started, VideoReDo will attempt for correct sync

to be within a audio or video frame.

Maximum Audio Frame Errors: Audio frames occur when VideoReDo does not find the start of an

audio frame when expected. This situation is typically caused when the capture card drops frames when writing

the program stream to the disk. When an audio frame error is encountered, the editor will automatically attempt

to re-synchronize itself to the audio stream and proceed. This parameter specifies how many re-

synchronization attempts should be attempted before VideoReDo stops processing the present file. Audio

frame errors may be encountered both during playback as well as output processing. The number of audio

errors encountered during output processing is reported in the

Output Processing Complete Dialog. By

default, VideoReDo sets this parameter to a very high value of 32000 so that only the most corrupt audio