Downloaded video, but video can't fast-forward/ rewind / move to certain time point
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Gary Ng
Jun 4, 2022, 7:19:50 AM6/4/22
to Video DownloadHelper Q&A
Hi all,
I tried using video downloadhelper from my university's online teaching using Firefox and Edge. Both versioned 7.6.
Windows
Win x86-64.
Mozilla Firefox 101.0
Edge 102.0.1245.30
The files downloaded smoothly in mp4 format without the need for conversion.
But when playback, I can only always play from the start. The video can be paused. But I can't fast-forward / rewind or move to certain time point.
Is there any setting I can do with it?
I used to use the program and it went well. Last month, I accidentally uninstalled the program, and just installed back and found out it didn't play4 back well.
Any advice on it please? Thanks.
Best regards,
Gary
mjs
Jun 4, 2022, 8:07:51 AM6/4/22
to Video DownloadHelper Q&A
I have struck that problem , you should look at the properties for the video. You'll will find there is no time shown for length.
Try every variant listed to see if you get a file that includes a duration.
--
A vdh user
Wild Willy
Jun 4, 2022, 8:15:44 PM6/4/22
to Video Download Helper Google Group
Interesting. I've never had a problem with VLC playing anything forward, backward, fast,
slow, single frame. I have noticed that single frame stops working when you're within a
few seconds of the end of a clip. I've also noticed that after you pause, there is a
momentary glitch in the video when you resume. But you can avoid that by rewinding 1
second while you are still in pause & then resuming playback. Or just rewind back before
the glitch & replay that section. The glitch won't occur again. I have also seen that
if you do several seconds' worth of single-frame playback, the image will pixellate after
one or two dozen frames. Once again, you can avoid that by pausing, rewinding 1 second,
then going into single frame. Or just wait until the pixellation happens, then rewind 1
second, then resume single frame. It seems like the higher the resolution, the more
likely it is you'll see these problems. Or maybe it's just bit rate that is the
correlating factor. I haven't studied it in depth. But these are all issues with VLC,
not VDH. What player are you using?
When you (mjs) have seen the problem, have you been able to determine some common factor
that predicts the problem will occur? Does it happen only with certain players or with
every player, including VLC?
It would be good if you (Gary) could give a URL for your problem video. I suspect,
though, from your saying that it's an online education site, that you need to be an
enrolled student at that school to get at any examples. That means nobody else can test
this out, unless you know another student there who could try to replicate your problem.
My gut reaction is that this is an issue with the player you are using, not VDH. But I
admit I'm guessing. I'd have to be able to download the same content you do before I
could promote my guess to an assertion or confirm the problem.
slow, single frame. I have noticed that single frame stops working when you're within a
few seconds of the end of a clip. I've also noticed that after you pause, there is a
momentary glitch in the video when you resume. But you can avoid that by rewinding 1
second while you are still in pause & then resuming playback. Or just rewind back before
the glitch & replay that section. The glitch won't occur again. I have also seen that
if you do several seconds' worth of single-frame playback, the image will pixellate after
one or two dozen frames. Once again, you can avoid that by pausing, rewinding 1 second,
then going into single frame. Or just wait until the pixellation happens, then rewind 1
second, then resume single frame. It seems like the higher the resolution, the more
likely it is you'll see these problems. Or maybe it's just bit rate that is the
correlating factor. I haven't studied it in depth. But these are all issues with VLC,
not VDH. What player are you using?
When you (mjs) have seen the problem, have you been able to determine some common factor
that predicts the problem will occur? Does it happen only with certain players or with
every player, including VLC?
It would be good if you (Gary) could give a URL for your problem video. I suspect,
though, from your saying that it's an online education site, that you need to be an
enrolled student at that school to get at any examples. That means nobody else can test
this out, unless you know another student there who could try to replicate your problem.
My gut reaction is that this is an issue with the player you are using, not VDH. But I
admit I'm guessing. I'd have to be able to download the same content you do before I
could promote my guess to an assertion or confirm the problem.
Wild Willy
Jun 4, 2022, 8:32:37 PM6/4/22
to Video Download Helper Google Group
Something else just occurred to me. It is a known issue that streams containing
timed_ID3 data can cause problems with playback. If you download using ffmpeg instead of
VDH, you won't see the problem because you get finer control over the download with
ffmpeg than you do with VDH, so you can avoid the timed_ID3 data. I believe VDH -- at
least, the latest VDH 7.6.3a1 beta with CoApp 1.6.3 -- correctly ignores timed_ID3 data
in most cases. But I recently encountered a problem here in which the content contained
a pair of timed_ID3 data tracks. I suspect Michel coded only for the possibility of a
single timed_ID3 data track, not multiple such tracks.
There are a few threads in here in which I talk about timed_ID3 data. You can do a
search using that as your search key & you'll find them. As for downloading with ffmpeg,
take a look in this thread:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/BzPLK2YyL-s
Do a string search on "cannot download" in there & you'll find a link to a tutorial on
how to use ffmpeg.
timed_ID3 data can cause problems with playback. If you download using ffmpeg instead of
VDH, you won't see the problem because you get finer control over the download with
ffmpeg than you do with VDH, so you can avoid the timed_ID3 data. I believe VDH -- at
least, the latest VDH 7.6.3a1 beta with CoApp 1.6.3 -- correctly ignores timed_ID3 data
in most cases. But I recently encountered a problem here in which the content contained
a pair of timed_ID3 data tracks. I suspect Michel coded only for the possibility of a
single timed_ID3 data track, not multiple such tracks.
There are a few threads in here in which I talk about timed_ID3 data. You can do a
search using that as your search key & you'll find them. As for downloading with ffmpeg,
take a look in this thread:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/BzPLK2YyL-s
Do a string search on "cannot download" in there & you'll find a link to a tutorial on
how to use ffmpeg.
mjs
Jun 4, 2022, 10:26:01 PM6/4/22
to Video DownloadHelper Q&A
I think this is related to another post l answered
I don't have vlc installed only the two media players installed in windows 10. I did find that a file of a video downloaded had not
specified a duration in the properties. The length of the video was empty, therefore no ability to fast forward or rewind.
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