Ubuntu
libav package

Converting from .ogv to .webm produces visual corruption

Bug #916683 reported by Christopher Kyle Horton
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
libav (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

I take screen recordings of my desktop in the .ogv format using gtk-recordmydesktop, then convert them to WebM using the command:

ffmpeg -i input.ogv output.webm

This has worked fine until today. Now, when I try converting videos using this method, I get small discolored boxes appearing in the output file. See attached files for a comparison.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ffmpeg 4:0.7.3-2ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-8.15-generic 3.2.0
Uname: Linux 3.2.0-8-generic x86_64
ApportVersion: 1.90-0ubuntu2
Architecture: amd64
Date: Sun Jan 15 00:40:40 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111129.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: libav
UpgradeStatus: Upgraded to precise on 2011-12-13 (32 days ago)

Revision history for this message
Christopher Kyle Horton (christhehorton) wrote :
Revision history for this message
Christopher Kyle Horton (christhehorton) wrote :
Revision history for this message
Christopher Kyle Horton (christhehorton) wrote :

I took the linked .ogv and transferred it to my 11.10 partition, and ran the same command there to convert it to WebM. The result there looked okay; I'm guessing this is a regression.

Revision history for this message
Bob Bib (bobbib) wrote :

Have you tried this?

ffmpeg -vcodec copy -acodec copy -i input.ogv output.webm

Revision history for this message
Bob Bib (bobbib) wrote :

Only VP8 video and Vorbis audio are supported for WebM. Sorry.

Revision history for this message
Christopher Kyle Horton (christhehorton) wrote :

Yeah, I tried that command too and it gave me the same error message.

I took a closer look at ffmpeg's terminal output and it mentioned that avconv was intended to be its replacement, as ffmpeg is no longer maintained. Luckily enough, it appeared to have already been installed on my machine as part of the libav-tools package. So running:

avconv -i input.ogv output.webm

took a while longer than under ffmpeg, but the end result did not have the same visual issues. I'll be switching to using that now.

Revision history for this message
Bob Bib (bobbib) wrote :

christhehorton,
have you noticed that FFmpeg had been forked and the fork named Libav is used in Ubuntu (starting from 11.04)? I've learned about it only after googling for that "avconv" program. FFmpeg & Libav have different release version numbers (and probably some other things), which causes some confusion...

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in libav (Ubuntu):
status: New → Confirmed
Revision history for this message
Christopher Kyle Horton (christhehorton) wrote :

Thanks spammers in the last two comments, but I think we'd like to find a way to stick with Ubuntu.

Revision history for this message
Sebastian Ramacher (s-ramacher) wrote :

Closing since Christopher said that using avconv works as expected.

Changed in libav (Ubuntu):
status: Confirmed → Fix Released
To post a comment you must log in.
This report contains Public information  
Everyone can see this information.
Subscribing...

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.