Usable DivX Settings for ATSC HDTV ffmpeg

[luttrell1962]

I changed some settings in the config.xml file for divx conversion that looks reasonable but still about half the size of a ts file.

Code:

<Conversion name="DivX" cmd="-y -i {SOURCE_FILE} -f avi -ab 224k -ac 2 -acodec mp3 -vcodec mpeg4 -s 1280x720 -b 4000k -vtag DIVX {DEST_FILE}" targetExtension=".avi" />

You might be able to lower the bit rate -b option more but it looks good like this.

[luttrell1962]

I'm working on this conversion, but the audio gets out of sync if a frame is dropped during atsc recording. Not sure how to fix it yet.

[JonnyCam]

run the file through TSdoctor before doing your transcode? (or any ocf the other TS timeline tools)

[luttrell1962]

I created a 2-pass batch file for avi, this might fix the problem but at least I learned how to do it and can put the fixer in the batch file if still needed. I'll post the code when I get it all straitened out.

I got most of the info from
http://forums.nextpvr.com/showthread.php?t=41060

[luttrell1962]

Do you know the command line options for tsdoctor. I could not find them. What other timeline tools are available I searched around but could only find stuff for linux.

A 2 pass ffmpeg sure takes a long time, I have a quad cored running at 3.6ghz and upped the threads to 8

[mvallevand]

There is no command line for tsdoctor and Cypheros the author was not interested in this the last time I asked. For just fixing the timeline on an otherwise good file tsmuxer is best but a generic command line requires a fixed input file name. ts4np and tsremux are two other command line options to consider.

Martin

[luttrell1962]

Thanks very much, something to do tonight

[luttrell1962]

I found tsremux works and keeps the sound correct after Xvid conversion to avi. All in a batch file

Code:

"D:\Program Files (x86)\Devnz\GBPVR\Third Party\tsremux.exe" %1 temp.ts
del %1
copy temp.ts %1
del temp.ts

tsremux stores the temp.ts file the gbpvr directory

Now I'm working on 2-pass mpeg4 VBR but am having problems but will start a new thread. Xvid codec does not allow upping the threads in ffmped. I can double the conversion speed using the mpeg4 codec.

[luttrell1962]

So I started using TsMuxer instead but you need to create a meta file, here's a copy of my bat file.

Code:

echo MUXOPT --no-pcr-on-video-pid --new-audio-pes --vbr  --vbv-len=500 > temp.meta
echo V_MPEG-2, %1, fps=29.970, track=49 >> temp.meta
echo A_AC3, %1, timeshift=-549ms, track=52, lang=eng >> temp.meta
"d:\Program Files (x86)\Devnz\GBPVR\Third Party\tsmuxer.exe" temp.meta temp.ts
del %1
copy temp.ts %1
del temp.ts
"D:\Program Files (x86)\Devnz\GBPVR\Third Party\ffmpeg\ffmpeg.exe" -y -i %1 -an -f avi -threads 6 -s 1280x720 -pass 1 -b 3000k -minrate 0k -maxrate 10000k -vcodec mpeg4 -bufsize 1000k -vtag divx nul
"D:\Program Files (x86)\Devnz\GBPVR\Third Party\ffmpeg\ffmpeg.exe" -y -i %1 -ab 128k -acodec mp3 -ac 2 -ar 44100 -f avi -threads 6 -s 1280x720 -pass 2 -b 3000k -minrate 0k -maxrate 10000k -vcodec mpeg4 -bufsize 1000k -vtag divx %2
DEL ffmpeg*.log
rem IF EXIST "%~dp1%~n1.avi" DEL %1
EXIT

It also has ffmpeg code to convert the ts file to a avi file to 720p. But the audio does not always convert but I'm working on that. Quality is great though and file size is is only 1/3 the size of original.

The batch file creates the meta file in the GBPVR directory and the temp.ts file there. Then I copy it to %1 source directory and filename.

After loading another file I'm not sure if the track= xxx does anything. Timeshift seems to be different for other files. So this may not be a good solution

[majortom999]

Off topic, slightly...Just curious why it seems so many people seem to like .AVI? Pokin around the net, ya see most folks using .AVI to share their videos, etc.
must be a reason?