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Hi
When i copy an avi file from my hard drive ( "c" ) to my thumb drive (I) the files won't play on the i drive.
thanks

Please, share messages.

sometimes i get that the file is broken, sometimes the whole movie is there but won't play

Tools -> Messages (set Verbosity to 2) before playback.

here is the message :main debug: processing request item The American R5 READNFO XViD - IMAGiNE.avi node Playlist skip 1
main debug: resyncing on The American R5 READNFO XViD - IMAGiNE.avi
main debug: The American R5 READNFO XViD - IMAGiNE.avi is at 0
main debug: looping - restarting at beginning of node
main debug: starting new item
main debug: creating new input thread
main debug: Creating an input for 'The American R5 READNFO XViD - IMAGiNE.avi'
main debug: thread (input) created at priority 1 (../.././src/input/input.c:214)
qt4 debug: IM: Setting an input
main debug: thread started
main debug: using timeshift granularity of 50 MiB
main debug: using timeshift path 'C:\DOCUME~1\Boyd\LOCALS~1\Temp'
main debug: `file:///I:/The%20American%20R5%20READNFO%20XViD%20-%20IMAGiNE.avi' gives access `file' demux `' path `I:\The American R5 READNFO XViD - IMAGiNE.avi'
main debug: creating demux: access='file' demux='' path='I:\The American R5 READNFO XViD - IMAGiNE.avi'
main debug: looking for access_demux module: 2 candidates
main debug: no access_demux module matching "file" could be loaded
main debug: TIMER module_need() : 20.152 ms - Total 20.152 ms / 1 intvls (Avg 20.152 ms)
main debug: creating access 'file' path='I:\The American R5 READNFO XViD - IMAGiNE.avi'
main debug: looking for access module: 2 candidates
filesystem debug: opening file `I:\The American R5 READNFO XViD - IMAGiNE.avi'
main debug: using access module "filesystem"
main debug: TIMER module_need() : 21.216 ms - Total 21.216 ms / 1 intvls (Avg 21.216 ms)
main debug: Using AStream*Stream
main debug: pre buffering
main debug: received first data after 0 ms
main debug: pre-buffering done 1024 bytes in 0s - 9009 KiB/s
main debug: looking for stream_filter module: 2 candidates
main debug: no stream_filter module matching "any" could be loaded
main debug: TIMER module_need() : 0.594 ms - Total 0.594 ms / 1 intvls (Avg 0.594 ms)
main debug: looking for stream_filter module: 1 candidate
main debug: using stream_filter module "stream_filter_record"
main debug: TIMER module_need() : 0.508 ms - Total 0.508 ms / 1 intvls (Avg 0.508 ms)
main debug: creating demux: access='file' demux='' path='I:\The American R5 READNFO XViD - IMAGiNE.avi'
main debug: looking for demux module: 51 candidates
avi debug: found Chunk fourcc:46464952 (RIFF) size:1525696988 pos:0
avi debug: found LIST chunk: 'AVI '
avi debug: <list 'AVI '>
avi debug: found Chunk fourcc:5453494c (LIST) size:8830 pos:12
avi debug: found LIST chunk: 'hdrl'
avi debug: <list 'hdrl'>
avi debug: found Chunk fourcc:68697661 (avih) size:56 pos:24
avi debug: avih: streams:2 flags: HAS_INDEX IS_INTERLEAVED 720x400
avi debug: found Chunk fourcc:5453494c (LIST) size:4244 pos:88
avi debug: found LIST chunk: 'strl'
avi debug: <list 'strl'>
avi debug: found Chunk fourcc:68727473 (strh) size:56 pos:100
avi debug: strh: type:vids handler:0x64697678 samplesize:0 25.00fps
avi debug: found Chunk fourcc:66727473 (strf) size:40 pos:164
avi debug: strf: video:XVID 720x400 planes:1 24bpp
avi debug: found Chunk fourcc:4b4e554a (JUNK) size:4120 pos:212
avi debug: </list 'strl'>
avi debug: found Chunk fourcc:5453494c (LIST) size:4234 pos:4340
avi debug: found LIST chunk: 'strl'
avi debug: <list 'strl'>
avi debug: found Chunk fourcc:68727473 (strh) size:56 pos:4352
avi debug: strh: type:auds handler:0x00000000 samplesize:1 24000.00fps
avi debug: found Chunk fourcc:66727473 (strf) size:30 pos:4416
avi debug: strf: audio:0x0055 channels:2 48000Hz 0bits/sample 187kb/s
avi debug: found Chunk fourcc:4b4e554a (JUNK) size:4120 pos:4454
avi debug: </list 'strl'>
avi debug: found Chunk fourcc:5453494c (LIST) size:260 pos:8582
avi debug: found LIST chunk: 'odml'
avi debug: <list 'odml'>
avi debug: found Chunk fourcc:686c6d64 (dmlh) size:248 pos:8594
avi warning: unknown chunk (not loaded)
avi debug: </list 'odml'>
avi debug: </list 'hdrl'>
avi debug: found Chunk fourcc:4b4e554a (JUNK) size:1382 pos:8850
avi debug: found Chunk fourcc:5453494c (LIST) size:1520857524 pos:10240
avi debug: skipping movi chunk
avi debug: found Chunk fourcc:54197fec (?T) size:17917 pos:1520867772
avi warning: unknown chunk (not loaded)
avi debug: found Chunk fourcc:31300000 ( ) size:1073783 pos:1520885698
avi warning: unknown chunk (not loaded)
avi debug: found Chunk fourcc:31300000 ( ) size:1073783 pos:1521959490
avi warning: unknown chunk (not loaded)
avi debug: found Chunk fourcc:31300000 ( ) size:1073783 pos:1523033282
avi warning: unknown chunk (not loaded)
avi debug: found Chunk fourcc:31300000 ( ) size:1073783 pos:1524107074
avi warning: unknown chunk (not loaded)
avi debug: found Chunk fourcc:31300000 ( ) size:1073783 pos:1525180866
avi warning: unknown chunk (not loaded)
avi debug: </list 'AVI '>
avi debug: found Chunk fourcc:31300000 ( ) size:1073783 pos:1525180866
avi warning: unknown chunk (not loaded)
avi debug: * LIST-root size:1525696996 pos:0
avi debug: + RIFF-AVI size:1525696988 pos:0
avi debug: | + LIST-hdrl size:8830 pos:12
avi debug: | | + avih size:56 pos:24
avi debug: | | + LIST-strl size:4244 pos:88
avi debug: | | | + strh size:56 pos:100
avi debug: | | | + strf size:40 pos:164
avi debug: | | | + JUNK size:4120 pos:212
avi debug: | | + LIST-strl size:4234 pos:4340
avi debug: | | | + strh size:56 pos:4352
avi debug: | | | + strf size:30 pos:4416
avi debug: | | | + JUNK size:4120 pos:4454
avi debug: | | + LIST-odml size:260 pos:8582
avi debug: | | | + dmlh size:248 pos:8594
avi debug: | + JUNK size:1382 pos:8850
avi debug: | + LIST-movi size:1520857524 pos:10240
avi debug: | + ?T size:17917 pos:1520867772
avi debug: | + size:1073783 pos:1520885698
avi debug: | + size:1073783 pos:1521959490
avi debug: | + size:1073783 pos:1523033282
avi debug: | + size:1073783 pos:1524107074
avi debug: | + size:1073783 pos:1525180866
avi debug: + size:1073783 pos:1525180866
avi debug: AVIH: 2 stream, flags HAS_INDEX IS_INTERLEAVED
avi debug: stream[0] rate:25 scale:1 samplesize:0
avi debug: stream[0] video(XVID) 720x400 24bpp 25.000000fps
main debug: selecting program id=0
avi debug: stream[1] rate:24000 scale:1 samplesize:1
avi debug: stream[1] audio(0x55) 2 channels 48000Hz 0bits
avi warning: cannot find idx1 chunk, no index defined
avi debug: selected standard index for stream[0]
avi debug: selected standard index for stream[1]
avi error: no key frame set for track 0
avi debug: stream[0] created 0 index entries
avi error: no key frame set for track 1
avi debug: stream[1] created 0 index entries
avi warning: broken or missing index, 'seek' will be approximative or will exhibit strange behavior
avi debug: free chunk avih
avi debug: free chunk strh
avi debug: free chunk strf
avi debug: free chunk JUNK
avi debug: free chunk LIST
avi debug: free chunk strh
avi debug: free chunk strf
avi debug: free chunk JUNK
avi debug: free chunk LIST
avi warning: unknown chunk (not unloaded)
avi debug: free chunk LIST
avi debug: free chunk LIST
avi debug: free chunk JUNK
avi debug: free chunk LIST
avi warning: unknown chunk (not unloaded)
avi warning: unknown chunk (not unloaded)
avi warning: unknown chunk (not unloaded)
avi warning: unknown chunk (not unloaded)
avi warning: unknown chunk (not unloaded)
avi warning: unknown chunk (not unloaded)
avi debug: free chunk RIFF
avi warning: unknown chunk (not unloaded)
avi debug: free chunk LIST
lua debug: Trying Lua scripts in C:\Documents and Settings\Boyd\Application Data\vlc\lua\playlist
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\playlist
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\anevia_streams.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\anevia_xml.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\appletrailers.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\bbc_co_uk.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\break.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\canalplus.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\cue.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\dailymotion.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\france2.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\googlevideo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\jamendo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\joox.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\katsomo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\koreus.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\lelombrik.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\megavideo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\metacafe.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\metachannels.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\mpora.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\pinkbike.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\rockbox_fm_presets.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\vimeo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\youtube.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\youtube_homepage.lua
avcodec debug: detected format: mp3
avcodec debug: adding es: audio codec = mpga
avcodec debug: AVFormat supported stream
avcodec debug: - format = mp3 (MPEG audio layer 2/3)
avcodec debug: - start time = 0
avcodec debug: - duration = 63570708167
main debug: using demux module "avcodec"
main debug: TIMER module_need() : 3343.248 ms - Total 3343.248 ms / 1 intvls (Avg 3343.248 ms)
main debug: looking for a subtitle file in I:\
main debug: looking for decoder module: 34 candidates
avcodec debug: libavcodec already initialized
avcodec debug: trying to use direct rendering
avcodec debug: ffmpeg codec (MPEG-4 Video) started
main debug: using decoder module "avcodec"
main debug: TIMER module_need() : 4.698 ms - Total 4.698 ms / 1 intvls (Avg 4.698 ms)
main debug: thread (decoder) created at priority 0 (../.././src/input/decoder.c:301)
main debug: thread started
main debug: looking for decoder module: 34 candidates
main debug: using decoder module "mpeg_audio"
main debug: TIMER module_need() : 2.329 ms - Total 2.329 ms / 1 intvls (Avg 2.329 ms)
main debug: thread (decoder) created at priority 2 (../.././src/input/decoder.c:301)
main debug: thread started
main debug: looking for meta reader module: 2 candidates
lua debug: Trying Lua scripts in C:\Documents and Settings\Boyd\Application Data\vlc\lua\meta\reader
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\reader
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\reader\filename.lua
main debug: no meta reader module matching "any" could be loaded
main debug: TIMER module_need() : 8.153 ms - Total 8.153 ms / 1 intvls (Avg 8.153 ms)
main debug: `file:///I:/The%20American%20R5%20READNFO%20XViD%20-%20IMAGiNE.avi' successfully opened
main debug: dying input
main debug: dying input
main debug: thread times: real 0m0.093750s, kernel 0m0.000000s, user 0m0.000000s
avcodec debug: ffmpeg codec (MPEG-4 Video) stopped
main debug: removing module "avcodec"
main debug: killing decoder fourcc `mp4v', 0 PES in FIFO
main debug: thread times: real 0m0.015625s, kernel 0m0.000000s, user 0m0.000000s
main debug: removing module "mpeg_audio"
main debug: killing decoder fourcc `mpga', 0 PES in FIFO
main debug: removing module "avcodec"
main debug: removing module "stream_filter_record"
main debug: removing module "filesystem"
main debug: Program doesn't contain anymore ES
main debug: thread ended
main debug: dead input
main debug: thread times: real 0m3.578125s, kernel 0m0.046875s, user 0m0.093750s
main debug: changing item without a request (current 0/1)
main debug: nothing to play
qt4 debug: IM: Deleting the input
main debug: TIMER input launching for 'The American R5 READNFO XViD - IMAGiNE.avi' : 3582.896 ms - Total 3582.896 ms / 1 intvls (Avg 3582.896 ms)

Have you cheched checksums of those files? (that they really match)