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Cannot rewind or go forward


Hi,

I tried the JW player and it works fine ... but when we try to rewind or go forward, it restarts..what might be wrong ?


Albert

21 Community Answers

Ethan Feldman

JW Player Support Agent  
0 rated :

Can you provide a link to where you are running this?

Note, you can only skip ahead of where the video has buffered to if you are using streaming.

JW Player

User  
0 rated :

Hi,

Thanks!

Its seems to be solved...we were using an MP4 file and just now tested with a FLV file - its working fine solving the rewind and fast-forward issue as well.


Albert

Ethan Feldman

JW Player Support Agent  
0 rated :

NP! :)

JW Player

User  
0 rated :

Same exact problem as the first poster:

MP4 videos I create all RESTART whenever trying to seek to any point within the "already downloaded" region (in front of, or behind the play head, both restart).

On my test site, use the playlist navigation buttons. |< >|

Video 1: restarts.mp4
Video 2: works.mp4

http://home.kmaage.operaunite.com/jwtest/content/

The tools I am using are ffmpeg, ffdshow x264 encoder, mp4box.

Ethan Feldman

JW Player Support Agent  
0 rated :

You need to use this application on your mp4 files – http://renaun.com/blog/2007/08/22/234/

JW Player

User  
0 rated :

Thanks, but aren't you simply referring to the "moov atom" issue for progressive download? My videos *do* work for progressive download (mp4box does the moov atom placement at the head of the file).

Or are you saying that the tool you reference *also* fixes the "video restarts when trying to seek" problem? It doesn't mention anything about that issue in the page you reference, and this post here is the only place I have heard the issue discussed on longtail's forums. Lots of posts talk about the moov atom and progressive download, but like I said, I don't have that problem.

My issue is like the poster said, my video *restarts* when trying to seek within the progressively downloading section.

See my example. Use the |< >| playlist buttons. Both videos progressively download fine. The first "restart.mp4" is one of my own, and shows the restart problem. "works.mp4" is one I got online.

http://home.kmaage.operaunite.com/jwtest/content/

Ethan Feldman

JW Player Support Agent  
0 rated :

The reason I ask you to use that application is because your file has to load entirely before it can be played for me, this application would fix that.

JW Player

User  
0 rated :

Which file? The first? The second? Both?

They progressively download for me and others, so that is strange, but not the issue. The adobe air application you reference doesn't do anything, as I suspected (because they already have the moov atom at the beginning. Mp4box does this already.): "ERROR: The MOOV atom is not located at the end of the file, the file is ready for progressive download or it is a invalid file"

So lets leave the progressive download issue aside. Allow the entire first video to download, the one which highlights the problem, and then try to skip to a different section. For me, the video *restarts*. Does this happen in your test as well?

My version details:
player: 5.0.753
flash: 10,0,45,2
browsers: Firefox 3.6.2

Ethan Feldman

JW Player Support Agent  
0 rated :

It was the first. Yes, when I scrub, it restarts.

The second video works fine. When I scrub ahead, it goes to the correct location

What is the difference between the two videos in terms of encoding?

Also, can you try to use 5.1 to see if makes a difference?

http://www.longtailvideo.com/players/jw-flv-player/

JW Player

User  
0 rated :

Ok. Good that I got someone "in the know" to reproduce it.

I will try using jwplayer 5.1 and report back.

The difference between the two is that I downloaded the second one, so I have no idea how it was encoded.

My own videos are encoded using ffdshow*[1]* into an .avi, then the video is moved into an .mp4 using ffmpeg*[2]*, audio is processed into an .aac using Nero*[3]* and mp4box remuxes the video and audio*[4]*.

Hope the detail helps you track down the issue. The .mp4 files themselves play fine in all the media players I have (windows media player, media player classic, vlc, quicktime)

Thanks for your help!

---
*[1]* ffdshow
version:
ffdshow tryouts revision 2527 Dec 17 2008, 19:30:39 (msvc 2008, x86, unicode)

The encoder says it is using these settings (places this info in the video stream as some sort of tag):
cabac=1 / ref=1 / deblock=0:0:0 / analyse=0x3:0x113 / me=hex / subme=5 / psy_rd=0.0:0.0 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=0 / threads=1 / nr=0 / decimate=1 / mbaff=0 / bframes=1 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / wpredb=0 / keyint=250 / keyint_min=1 / scenecut=40 / rc=abr / bitrate=600 / ratetol=1.0 / qcomp=0.50 / qpmin=2 / qpmax=31 / qpstep=4 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:0.30

*[2]* ffmpeg
FFmpeg version SVN-r22815-Sherpya...built on Apr 8 2010 06:25:06 with gcc 4.2.5 20090330 (prerelease) [Sherpya]
command:
ffmpeg -y -i video.avi -vcodec copy -acodec copy video.mp4

*[3]* aac audio
Nero AAC encoder v 1.3.3.0
command:
neroAacEnc.exe" -cbr 48000 -if audio.wav -of audio.aac

*[4]* mp4box
MP4Box - GPAC version 0.4.6-DEV (build 1)
command:
MP4Box.exe" -fps 15 -rem 2 -add "audio.aac#audio" -inter 500 video.mp4

JW Player

User  
0 rated :

bc.. Also, can you try to use 5.1 to see if makes a difference?
http://www.longtailvideo.com/players/jw-flv-player/


Confirmed that the problem still exists in 5.1.897

Ethan Feldman

JW Player Support Agent  
0 rated :

Can you try to encode your file in HandBrake? It is free, and I know the MP4 files that it produces work correct in the JW Player.

http://handbrake.fr/

JW Player

User  
0 rated :

No, I'm not going to re-encode my entire 1200+ videos. Handbrake does encoding only--there is no "muxing" of already encoded streams.

In doing some more testing, I decreased the minimum I frames to 5 in my regular workflow, but other than making the file much bigger, no change. Same problem.

I also did a true "reset to defaults" in the ffdshow x264 encoder, and that video didn't play at all, just the audio.

So apparently, I'm down to tweaking each of the many, many settings in the ffdshow x264 encoder until I find what the problem is. If and when I find it, I'll report back here...

Ethan Feldman

JW Player Support Agent  
0 rated :

Please let me know, I only suggested using that program because I know that the files it produces work correctly in the Player.

JW Player

User  
0 rated :

Was this problem ever figured out? I am having the same problem.

My example: http://www.blueskyfilms.com/jwplayer/index4.html

Thanks!

Ethan Feldman

JW Player Support Agent  
0 rated :

@martin – I can seek properly with your videos. I am using Firefox/XP. It takes a few seconds to update, but seeking works correctly.

JW Player

User  
0 rated :

I had this problem (video restarting when skipped) and solved it by adding more Keyframes to the video when encoding.

The encoder was set to "Keyframes : Automatic", I changed it to 1 keyframe/second and can now skip backward and forwards with no problems.

Hope this helps.

Steve K

JW Player

User  
0 rated :

Hey guys i have a problem. I edited and rendered a movie to mp4 type. So I could watch it in my ipod touch. But well the same problem happens to me. I cant rewind or go forward, it restarts. Even if I use it in my ipod it restarts but when I try to edit it it freezes. I used sony vegas pro 9.0 to edit the video, Please I need help.

Ethan Feldman

JW Player Support Agent  
0 rated :

@Help please – This is a forum for set up help with the JW Player.

JW Player

User  
0 rated :

sorry, Didn't know, well I will try to find it myself, thanks, though.

Ethan Feldman

JW Player Support Agent  
0 rated :

Np.

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