[FFmpeg-user] Mpg

Juan O Batista orestesb at comcast.net
Wed Sep 14 17:30:26 EEST 2016

Thank you Marcelo. 

I tried the statement that you send me. 

ffmpeg -i INPUT.mpg -c:v libx264 -x264opts keyint=123:min-keyint=20:a53cc=1 
-an -f mpegts OUTPUT.ts 

But i got error 
bad option 'ac53' '1' 


error while opening encoder for output stream #0:0 -maybe incorrect parameters such as bit_rate, rate, width or height 

The last error I got only I use ac53=1 

I use the last version for ffmpeg 

Thank you again. 

----- Original Message -----

From: "Marcelo Boufleur" <mboufleur at gmail.com> 
To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org> 
Sent: Tuesday, September 13, 2016 11:21:09 PM 
Subject: Re: [FFmpeg-user] Mpg 

> He mentioned a53cc, which appears as a flag to libx264 ("-a53cc true") and 
>> enables ... something. I've given it a brief look, but couldn't figure how 
>> it's supposed to work. I was hoping someone might have experience with it, 
>> because it must have a reason for it to be in the code. 
According to FFmpeg documentation: 

a53cc boolean 
Import closed captions (which must be ATSC compatible format) into output. 
Only the mpeg2 and h264 decoders provide these. Default is 0 (off). 

This is one of the options for the x264 encoder, which has to be used with 
the "-x264opts" parameter. 

According to the above description, this filters is meant for source MPG-2 
or H.264 content which already have A/53 Closed Captions embedded, and it 
will pass them on to the destination x264 file. 

Here is an example: 

ffmpeg -i INPUT.mpg -c:v libx264 -x264opts keyint=123:min-keyint=20:a53cc=1 
-an -f mpegts OUTPUT.ts 

I haven't tried this command myself, but AFAIK this is the only support 
FFmpeg currently has for Closed Captions. 
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