monline

This blog post helped me a lot with my AAC decoding issue and was not popping up in my first couple of Google searches. The fix for the "Error while decoding stream #0.0" messages to decode one of my AAC streams was (as descibed by llando on the linked page) to use the "libfaad" library for decoding the input stream. Eg.:

We've a desktop DVD recorder with a built-in TV tuner and a hard disk as a substitute for the old VCR technology. Sometimes I've to create a video from such TV rips, either in MPEG-4 or H.264 format. Since this recorder has no digital output (like an USB or Firewire connector), we used to copy the titles to a rewritable DVD disc and I recode the contents with HandBrake on my Mac. I'll put down now the parameters that I've found to produce a good result. These are by no means "the" optimal parameters, I'm just saving them for future reference and in case somebody else might profit from it.

If you share a video on Facebook, the thumbnail image of the video does not come directly from the website that is hosting the video itself. Facebook uses a wrapper script called safe_image.php to serve images from external webservers. The same is true if you share the link of an image. The problem is that this wrapper script does not accept all JPEG files, but only ones that have a JFIF header.

I googled quite a bit to find patches for ffmpeg that will allow conversion from 5.1 audio channels into stereo. This is necessary if you want to convert all sorts of videos into FLVs with mp3 audio channel (eg. if you operate a video streaming service), since mp3 supports only mono and stereo channels.

Extracting all frames from the video:
This will create files like frame-00001.png, frame-00002.png, etc.

Extracting a single frame is easy too:
This will save the frame that is at 14.342s. The fractions in the offset (-ss) are good for specifying the frame within a second.

Using Adobe Flash Media Server to stream Flash videos (FLVs) you might hit on the following error messages:

• In FMS's core.00.log:
  
  2008-12-18      00:33:55        3687    (w)2611179      Warning from libflv.so: File contains bad meta data : /opt/adobe/fms/applications/vod/media/somedir/200812171225_327.flv (TCFLVData.cpp:490). -
• In the output of flvcheck (a utility shipped with FMS in the tools subdirectory to check FLVs for FMS compatibility):
  
  08-12-18 22:50:59       Error:  -9      Invalid FLV message footer.     200812171225_327.flv
  or
  
  08-12-18 22:51:12       Error:  -11     Found backward timestamp.       200812171228_328.flv

You can fix these errors using ffmpeg.

I tried to compile the current SVN trunk (16005) of FFmpeg on a Debian Etch system with libspeex support. However I got the error message as in the title of this post:

I used the libspeex-dev package that is part of Debian Etch (it was v1.1.12-3etch1).
Please, drop here a comment if you find out how to resolve this. Maybe I should download and compile libspeex from source? The one in Debian might be outdated.