ffmpeg encoding mpegts

[adismsc]

Hi,
is there anybody who can help me with video encoding? I want to encode video to MPEG-TS with null packet (PID 0x1fff). Anybody know how to do this? Is it possible?

My current command:

ffmpeg -i audio.mp2 -i video.mpg -s 720x576 -minrate 3200k -maxrate 3200k -bufsize 3200k -vcodec libx264 -vpre libx264-iptv -acodec copy -r 25 -f mpegts out.mpg

[Chris K]

mpg isn't a transport stream container. You should use out.ts

About null packets...

AFAIK, there is no setting for that but I once looked in the FFmpeg source code where null packets are mentioned so I suppose they are inserted automatically (not sure).

I would say, just try and see if the clip is accepted.

[adismsc]

Thanks for fast reply . How can I check it? Is there any app to check null packets in file?

[Bonie81]

do not know about ffmpeg, but x264/h264 encoder and tsmuxer should serve your purpose.
installing all invidual libraries gives better results, follow distro-documentation.

[adismsc]

Thank you Bonie. Now it looks better , but I have another problem. I want to mux two files: video.h264 (720x576, 25fps, 2.5Mbps CBR) and audio.mp2 (192kbps, 48kHZ) to MPEGTS 3.2Mbps CBR.

Mediainfo information from out.ts file muxed with tsMuxeR:

Overall bit rate : 3 200 Kbps
Maximum Overall bit rate : 35.5 Mbps

I need to mux it with CBR. Second thing is NIT table. I want to set only PAT and PMT nothing else.

Please help.

[Bonie81]

@adismsc

i do not have much experience or deep knowledge about DVB - Transport stream.
i do not think that any free encoder or muxer will serve your purpose for NIT Table. PAT and PMT.
Search for NTT HVE9100 H.264 and MPEG-2 Broadcast Encoder.

Last Q?
does ffmpeg serve your purpose for NIT Table. PAT and PMT?
coz they have specific broadcast version too!!!

[adismsc]

My specification is listed below:

Elementary stream bitrate [kbit/s]
video: 2575
audio: 2 x 192
subtitle: -
PAT/PMT: -
Stuffing: -

Component TS bitrate [kbit/s]
video: 2652
audio: 395
subtitle: 45
PAT/PMT: 45
Stuffing: 62
Total: 3200

Additional required components:
PAT
PMT
Null packets

without others:
NIT, SDT, EIT, etc.

I have two files: video.h264 (720x576, 25fps, 2.5Mbps CBR) and audio.mp2 (192kbps, 48kHZ). How can I mux it with this spec? Can I?

[pandy]

OpenCaster http://www.avalpa.com/the-key-values/15-free-software/33-opencaster

AFAIR TS in FFMPEG is not very well implemented (some people says that it is broken)

[adismsc]

No I have another problem

This is how my current script looks like:

vcodec="h264"
acodec="mpga"
bitrate="2500"
arate="192"
samplerate=48000
ext="mpg"
mux="ts"
vlc="/usr/bin/vlc"
fmt="mpg"
dst="/home/adam/test/"

for a in *$fmt; do
$vlc -I dummy -vvv "/home/adam/test/" --sout "#transcode{vcodec=$vcodec,venc=x264{profile=main,level=3.0,hrd=cbr,bframes=2},vb=$bitrate,acodec=$acodec,ab=$arate,samplerate=$samplerate,channels=2}:standard{mux=$mux,dst=\"$dst$a.$ext\",ac$
done

After encoding with the above script everything seems to be ok (for both video and audio bitrate codec is constant) apart from two things: Bitrate of the container should also remain CBR but this is not the case. Also, stuffing component (0x1 ffff) - null packet is missing. Is it possible for you to correct the script to make null packet as well as bitrate of the container constant (3,2 Mbps CBR) ?

[pandy]

try to play with -muxrate if You insist to use ffmpeg

[adismsc]

I tried, but without the expected results (CBR).