Long Timestamp FLVs

[Velhans]

Hi, I recently found some FLV format videos from a screen capturing source which I have never been able to fix and maybe I can get some help here. The problem is the length of the FLV's when I play them show outrageous times, up to 190 hours in the timestamp and they skip and lag like crazy. But the video is there and plays, though I cannot skip through the video in a media player else they freeze, I basically can only start from the beginning and let them play through.

The actual time of the videos are I believe around and hour or so but the timestamp shows that extremely long length. I have no clue what was used to make the videos, some sort of screen recording software is all I know. But maybe someone has seen videos with this issue and can let me know if the video is salvageable for better viewing through a conversion program or the like. Any help would be appreciated.

[Baldrick]

Have you tried remux them to mp4 or mkv?

You can try flv extract (jofori version, https://www.videohelp.com/download/FLV%20Extract%202.2.1.2.zip ) . Open flv and remuxing to mp4 or mkv.

Or try mkvtoolnix / mkvmergegui, open the flv and make/mux a new mkv.


If they all fail then tell us the details from flv. Use mediainfo, open flv, view->text and copy everything.

[Budman1]

These all sound like problems encountered with most downloads of FLV's. Normally just removing the Metadata, including timings and replacing it fixes it.
I use FLVMeta to check the video:

flvmeta.exe -C "C:\path to video\corrupt.flv"

To remove Metadata I use Yandi:

"C:\path to Yamdi\yamdi.exe" -i "C:\path to video\corrupt.flv" -o "C:\path to video\corruptYam.flv" -M

Then reinsert it FLVMeta again:

"C:\Path to FLVMeta\FLVMeta.exe" -t -f "C:\path to video\corruptyam.flv" "C:\path to video\corruptyamNEW.flv"

Typical below:
Initial check

Remove Meta

Replace Meta

Final Check

[Velhans]

Ok so out of 6 videos I did get 3 of them to work with FLV Extract. Do only downside was there is no sound, which I am fine with for now. The last 3 all failed using FLV Extract and the MKV tools, these had generally the same name and were created about the same time so the method of creating them might have been different though they still have the same exact issues.

For these I tried Budman1's command lines and Utility program. The initial check of the video as shown in picture one crashed the Utility, I'll post a screenshot of the cmd prompt running flvmeta on the video and the errors shown. The remaining steps I was able to complete yet the end resulting video was basically just like the original, long timestamp ect.. I'll put a screenshot of the end result shown by the Utility and also the MediaInfo of the original video. Also the last warning from the Utility, the one about the "Invalid Keyframe" basically repeats itself with varying keyframes, but it is the last warning shown. Responses would be great, thanks.

[Budman1]

With all the ID errors and tag body length error, that looks like a captured streaming video that took some hits during capture? Sorenson Spark are usually easier to fix than AVC but it takes a hex editor like HxD to fix and most times chunks will be missing due to the wrong ID, multiple bytes of hex '00' and/or invalid frames removal.

If I do the math right, 319 MBytes X 8 bits in a byte = 2,552,000,000 bits divided by 9179 bit rate = 278025 seconds divided by 3600 seconds in hour = 77.229 hours. Pretty close to 81 hours. I'm betting there is a lot of hex '00' nulls in that video.

I see the Height and width is missing also and they are usually inserted by replacing metadata. You did replace metadata on the result of removal (Videoyam) and not original right? Just wondering.

You don't have a way to post that video do you? Or look at it with a hex editor. The first 17 hex bytes are important especially 00-05, 08 and 0D. OD may be 09 (Video) or 12 (Metadata). Also look thru and see if a lot of it is nulls (hex 00) in a row.