[vlc-devel] vlc's features attactive but correctness more important

zhu shi song zhushisongzhu at yahoo.com
Sun Jan 15 15:24:07 CET 2012

      I have tested several functions of VLC.  Transcoding,partial transcoding, partial cutting without reencoding are very attractive and make VLC so uniqure among media players.  But unfortunately, there are always some errors existing in these functions.  
1、For MP4(H264+AAC) cutting , time is not correct.

vlc  hz.mp4 --start-time=10 --stop-time=25 --sout=#:std{access=file,mux=mp4,dst=hzcut.mp4}
2、For partial transcoding from TS(mpeg4) to MP4, time is not correct
vlc  sgvideo.ts --start-time=10 --stop-time=30 --sout=#transcode{vcodec=h264,acodec=mp4a}:std{access=file,mux=mp4,dst=sgcut.mp4}
3、For TS(MPEG4) cutting, time is not correct
vlc sgvideo.ts --start-time=10 --stop-time=30 --sout=#:std{access=file,mux=ts,dst=sgcut.ts}
4、For WMV2 playing, time progress control is not tallied with key frame position.
     These flaws have a greatly reduced quality of vlc.  I think  we should pay attention to not only  adding more features to VLC, but also its correctness of every feature. We don't need to make quantity instead of quality.  Compared with other media players,  the advanced features of VLC are rich and attractive enough.  If  we don't  utilize them correctly,  of what use are these advanced features?
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