[mythtv-users] FFMPeg Commercial cutting puts audio out of sync

[Justin Alcorn]

Actually, I forgot about that.  The tests I did looks good, but I
haven't had time to watch the whole thing!   I'll adjust and check out
the difference.
--
Justin B. Alcorn
PGP Fingerprint A36D D691 C5B0 BE15 5A2A AF49 AA1C 372C


On Sun, Sep 14, 2014 at 11:09 AM, John Finlay <finlay at moeraki.com> wrote:
> On 9/13/2014 9:21 PM, Justin Alcorn wrote:
>>
>> On Sat, Sep 13, 2014 at 10:19 PM, Justin Alcorn <justin at jalcorn.net>
>> wrote:
>>>
>>> That's exactly what I was thinking. Thanks for the example.
>>
>>
>> Thanks for all the help. This works perfectly to losslessly cut the
>> H.264 Encoded recording, and put it in a mp4 container for mythroku.
>> It also takes just seconds on a medium powered machine.
>>
>> Run as UserJob /usr/local/bin/rokuencode.sh %DIR% %FILE%
>> =================================================
>> #!/bin/bash
>>
>> logfile=/home/mythtv/save/$$.log
>> # Close STDOUT file descriptor
>> exec 1<&-
>> # Close STDERR FD
>> exec 2<&-
>>
>> # Open STDOUT as $LOG_FILE file for read and write.
>> exec 1<>$logfile
>>
>> # Redirect STDERR to STDOUT
>> exec 2>&1
>>
>> INPUTFILE="${1}/${2}"
>>
>> workdir="/tmp/$$"
>> mkdir -p ${workdir}
>>
>> if [ ! -f $INPUTFILE ]; then
>>      echo "file doesn't exist, aborting."
>>      exit 1
>> fi
>>
>> #see if we have the DB info
>> test -f /etc/mythtv/mysql.txt && . /etc/mythtv/mysql.txt
>> test -f ~/.mythtv/mysql.txt && . ~/.mythtv/mysql.txt
>>
>> #let's make sure we have a sane environment
>> if [ -z "`which ffmpeg`" ]; then
>>      echo "FFMpeg not present in the path. Adjust environment or install
>> ffmpeg"
>>      exit 1
>> fi
>>
>> mysqlconnect="mysql -N -hlocalhost -umythtv -ppassword mythconverg"
>> export mysqlconnect
>>
>> #deteremine directory and filename
>> RECDIR=`dirname $INPUTFILE`
>> BASENAME=`basename $INPUTFILE`
>> tmp=`basename $BASENAME .mpg`
>>
>> chanid=`echo "select chanid from recorded where
>> basename=\"$BASENAME\";" | $mysqlconnect`
>> starttime=`echo "select starttime from recorded where
>> basename=\"$BASENAME\";" | $mysqlconnect`
>> if [ -z "$chanid" -o -z "$starttime" ];then
>>          echo "Info not found for select chanid from recorded where
>> basename=\"$BASENAME\""
>>          exit 1;
>> fi
>>
>> #lets make sure we have a cutlist before we proceed
>> if [ -z "`mythutil --getcutlist --chanid $chanid --starttime
>> "$starttime" | grep Cutlist | sed 's/Cutlist: $//'`" ]; then
>>      echo "no cutlist found....generating new cutlist"
>>      mythutil --chanid $chanid --starttime "$starttime" --gencutlist
>> #&>${logfile}
>> fi
>>
>> CUTLIST=`mythutil --chanid $chanid --starttime "$starttime"
>> --getcutlist | grep Cutlist | sed 's/Cutlist: //' | sed 's/-/,/g' |
>> sed 's/^0,//'`
>>
>> echo $CUTLIST
>>
>> echo "ffmpeg -i  ${RECDIR}/${BASENAME} -map 0 -c copy -f ssegment
>> -segment_list ${workdir}/out.ffconcat -segment_frames $CUTLIST
>> ${workdir}/out%03d.mp4"
>> ffmpeg -i  ${RECDIR}/${BASENAME} -map 0 -c copy -f ssegment
>> -segment_list ${workdir}/out.ffconcat -segment_frames $CUTLIST
>> ${workdir}/out%03d.mp4
>> cat ${workdir}/out.ffconcat | awk 'NR%2==1' > ${workdir}/in.ffconcat
>> echo "ffmpeg -f concat -i ${workdir}/in.ffconcat -c copy
>> ${RECDIR}/${tmp}.mp4"
>> ffmpeg -y -f concat -safe 0 -i ${workdir}/in.ffconcat -c copy
>> ${RECDIR}/${tmp}.mp4
>>
>> #well need a new filesize to update the db with
>> filesize=$(du -b ${RECDIR}/${tmp}.mp4 | awk '{print $1}')
>>
>> #update db with new filesize and filename
>> cat <<EOF | $mysqlconnect
>> UPDATE
>>          recorded
>> SET
>>          filesize = ${filesize},
>>          cutlist = 0,
>>          basename = "${tmp}.mp4"
>> WHERE
>>          chanid = ${chanid} AND
>>          starttime = "${starttime}";
>> EOF
>>
>> #delete the old commercial skip info
>> cat <<EOF | $mysqlconnect
>> DELETE FROM
>>          recordedmarkup
>> WHERE
>>          chanid = ${chanid} AND
>>          starttime = "${starttime}" AND
>>          (type = 4 OR type = 5);
>> EOF
>>
>> cat <<EOF | $mysqlconnect
>> DELETE FROM
>>          recordedseek
>> WHERE
>>          chanid = ${chanid} AND
>>          starttime = "${starttime}";
>>
>> EOF
>>
>> #cleanup $workdir
>> rm -rf ${workdir}/*${tmp}*
>> =========================================================================
>> --
>>
> Your script doesn't seem to adjust the cutlist entry values for the
> difference in frame counting base between ffmpeg and the myth editor. Did
> you resolve this some other way or did I miss this adjustment?
>
>
> John
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