Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: which video formats are playable on usb
Document: I cannot figure out what video format the player accepts from a USB device. I thought it would accept the device in the same format as a DVD - it did not. I tried several formats, none of those worked.
I returned this item because it said it would play my video files from portable hard drive and included MP4 files but every time I tried to play an MP4 it would say video codec not supported, I went to manufacturer for an update but they said there was no updates ajnd while it would play MP4's it would only play 1 out of 5 of the different formats for MP4
Rewind is always in 2x or faster, so finding a precise frame is next to impossible, and with not screen display of frames, you're always guessing.If your convert CDs to raw digital formats like avi, or compiled formats like MKV, then you know that sometimes audio track can get out of sync with the video track. Better DVD players allow you to syncronize by delaying or advancing the audio track by fractions of seconds.
it says it plays old discs with scratches and smudges -  it don't play it skips a lotit says it plays movies from usb - it don't even read any movie files from my flash drive
Im still trying to get the usb drive to play movies... its the whole reason I bought this freakin thing.. not too pleased with this purchase other than it plays dvds... woop dee doo..
The Philips DVD player is not compatible with .mp4 ,.avi formats and I cannot play half of my movies. It did not fill my expectations.
If you were buying it for the USB port, good luck - let me know if you figure out the formats, I'm hoping its something that I just overlooked.
Software updates, on the Phillips web site, stop in 2011 for this unit, so...set the wayback machine, or get a more expensive blue-ray player if USB is your input choice..It is possible to find more than a few web sites that will down convert modern file formats to the older sorts, assuming you enjoy that sort of techno-torture and guaranteed dubious results.
While the upsampled picture on this DVD player is pretty good, I have had trouble with this player's functioning as intended.This player had trouble with playing all kinds of discs -- both commercial and DVDR formats.When it fails to read a block on disc, it retries until it times out, and your picture and audio hang for 15 seconds or more. Pressing buttons on the remote does not interrupt the process -- you just have to wait until the device gets itself ready again.
We're happy with this for the price, but it is rather loud when shuffling through menu options. Relatively quiet when playing video.
Answer: The user manual is available here - http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?slg=en&scy;=us&ctn;=DVP3680/F7