Fixing Flash videos (FLV) for use with Adobe Flash Media Server (FMS)
Thu, 2008.12.18 - 23:37 — müzso
Using Adobe Flash Media Server to stream Flash videos (FLVs) you might hit on the following error messages:
FFmpeg has a "copy" mode of processing: it copies raw codec data as is. You can specify the
I've created a small shellscript to check and repair all "broken" FLVs in a directory (and its subtree):
Put it into a script (eg. flvfix.sh), assign execute permissions (
The script will create a logfile with the names of all files that it had fixed (or not fixed if ffmpeg failed). It will also keep a backup of the original FLV (ie. it renames the original *.flv into *.flv.orig).
PS: I've fetched ffmpeg from SVN on 4th Dec 2008 and compiled from source (with support for all sorts of codecs), but since the "copy" mode does not involve decoding of the streams, I assume you could do the same fix with a stock (repository) version of ffmpeg in Debian or Ubuntu.
- 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 thetoolssubdirectory to check FLVs for FMS compatibility):
or08-12-18 22:50:59 Error: -9 Invalid FLV message footer. 200812171225_327.flv
08-12-18 22:51:12 Error: -11 Found backward timestamp. 200812171228_328.flv
FFmpeg has a "copy" mode of processing: it copies raw codec data as is. You can specify the
copy codec for both video and audio streams, in which case the streams remain untouched (thus video quality stays the same), only the container metadata is regenerated (ie. fixed if it was "broken"). So running the following command on an FLV that FMS had problems with fixes it:ffmpeg -i input.flv -vcodec copy -acodec copy output.flvI've created a small shellscript to check and repair all "broken" FLVs in a directory (and its subtree):
#!/bin/sh
flvcheck=/opt/adobe/fms/tools/flvcheck
logfile=flvfix.log
if [ -f "${logfile}" ]; then
rm "${logfile}"
fi
for file in $(find . -type f -iname '*.flv'); do
dir=$(dirname "${file}")
base=$(basename "${file}")
"${flvcheck}" -q "${file}" > /dev/null 2>&1
if [ $? -ne 0 ]; then
mv "${file}" "${file}.orig"
ffmpeg -i "${file}.orig" -vcodec copy -acodec copy "${file}" > /dev/null 2>&1
if [ $? -eq 0 ]; then
#note: you might want to change owner or permissions of the new file
# so your streamer/webapp can access it
#chown fms "${file}"
echo "${file} was fixed" >> "${logfile}"
"${flvcheck}" -n "${file}" >> "${logfile}"
else
echo "${file} was not fixed (ffmpeg failed)" >> "${logfile}"
mv "${file}.orig" "${file}"
fi
fi
donePut it into a script (eg. flvfix.sh), assign execute permissions (
chmod a+x flvfix.sh) and run in the directory where you store your FLVs. Eg.cd /mnt/fms_storage
~/bin/flvfix.shPS: I've fetched ffmpeg from SVN on 4th Dec 2008 and compiled from source (with support for all sorts of codecs), but since the "copy" mode does not involve decoding of the streams, I assume you could do the same fix with a stock (repository) version of ffmpeg in Debian or Ubuntu.
All of my own contents here (if not noted otherwise) are licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License. My posts reflect my personal opinion and shall not be associated with any of my employers.
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License. My posts reflect my personal opinion and shall not be associated with any of my employers.
Comments
backward time stamp in live flvs
there was something regarding this on this link also
http://askmeflash.com/index.php?p=qlist
Richard
Re: backward time stamp in live flvs