Clean: Difference between revisions
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'''Cleaning''' a stream means to remove errors from it. |
'''Cleaning''' a stream means to remove errors from it. |
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Usually the MPEG stream |
Usually the MPEG stream received by an antenna contains some errors as reception is not always perfect. Such slightly-damaged streams might crash your video editing software if you want to edit it after (although players like [[MPlayer]] and [[gxine]] are quite tolerant). Therefore, cleaning is mostly interesting if you want to [[Post-processing|post-process]]/[[recode]] your recording. |
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It's not important for just watching films. See the MPlayer documentation: |
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''The player is rock solid playing damaged MPEG files (useful for some VCDs), and it plays bad AVI files which are unplayable with the famous windows media player. Even AVI files without index chunk are playable, and you can temporarily rebuild their indexes with the -idx option, or permanently with MEncoder, thus enabling seeking! As you see, stability and quality are the most important things, but the speed is also amazing. There is also a powerful filter system for video and audio manipulation.'' |
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===Cleaning a Stream with MEncoder === |
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A good way of cleaning up a corrupted stream is to run it through [[MEncoder]]. The following will clean up the structure of a program stream: |
A good way of cleaning up a corrupted stream is to run it through [[MEncoder]]. The following will clean up the structure of a program stream: |
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$ mencoder -forceidx -lavdopts er=4 -vc ffmpeg12 -of mpeg |
$ mencoder -forceidx -lavdopts er=4 -vc ffmpeg12 -of mpeg -oac copy -ovc copy original_ps.mpeg -o cleaned_ps.mpeg |
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-oac copy -ovc copy \ |
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original_ps.mpeg -o cleaned_ps.mpeg |
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-oac copy -ovc copy -aid 600 -vid 601 \ |
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original_ts.mpeg -o cleaned_ps.mpeg |
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See [[Project X]]. |
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* [http://www.carfax.org.uk/docs/DVB/ Source: "Digital Video Broadcasting – A practical guide"] |
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=== ProjectX === |
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It is possible to clean up a stream using the GUI (and console) features of [[ProjectX]]. |
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Easily to install, divides an MPEG [[PS]] into its audio and video [[ES]]s. It is very fault tolerant. (Well, not too fault tolerant, as it didn't cope with all my recordings.) |
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[[Category:Software]] |
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[[Category:Technology]] |
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Latest revision as of 01:54, 3 May 2009
Cleaning a stream means to remove errors from it.
Usually the MPEG stream received by an antenna contains some errors as reception is not always perfect. Such slightly-damaged streams might crash your video editing software if you want to edit it after (although players like MPlayer and gxine are quite tolerant). Therefore, cleaning is mostly interesting if you want to post-process/recode your recording.
MEncoder
A good way of cleaning up a corrupted stream is to run it through MEncoder. The following will clean up the structure of a program stream:
$ mencoder -forceidx -lavdopts er=4 -vc ffmpeg12 -of mpeg -oac copy -ovc copy original_ps.mpeg -o cleaned_ps.mpeg
This forces MEncoder to read the file as an MPEG-2 stream and uses aggressive error detection and correction, but otherwise just copies the audio and video stream (so no re-encoding and it's quite fast).
You can also use this method to extract specific PIDs from a Transport Stream and produce a clean Program Stream, by using the -aid and -vid options to MEncoder to select the audio and video PIDs repectively:
$ mencoder -forceidx -lavdopts er=4 -vc ffmpeg12 -of mpeg -oac copy -ovc copy -aid 600 -vid 601 original_ts.mpeg -o cleaned_ps.mpeg
ProjectX
It is possible to clean up a stream using the GUI (and console) features of ProjectX.