[FFmpeg-user] MPEG-TS structure.

[Dennis Perov]

Gents,

I'm trying to produce mpegts file with h.264/ac3 so it plays on a STB. I
have few questions regrading it:

How can I specify a frame structure in .ts file like : IBBPBBP... or
IBBBPBBBP...?

How can I change/specify PID value of audio/video track during/after the
encode?

Can I change PCR interval in mpeg-ts file?

Thanks!

[atv_ffmpeg]

For the first question, you may set GOPSIZE

2010/5/7 Dennis Perov <mediastream at gmail.com>

Post by Dennis Perov
Gents,
I'm trying to produce mpegts file with h.264/ac3 so it plays on a STB. I
How can I specify a frame structure in .ts file like : IBBPBBP... or
IBBBPBBBP...?
How can I change/specify PID value of audio/video track during/after the
encode?
Can I change PCR interval in mpeg-ts file?
Thanks!
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[Mike Scheutzow]

Post by Dennis Perov
Gents,
I'm trying to produce mpegts file with h.264/ac3 so it plays on a STB. I
How can I specify a frame structure in .ts file like : IBBPBBP... or
IBBBPBBBP...?

Yes. -g specifies number of frames in a GOP. -bf specifies number of B
frames.

For a more complete listing, you can use:

ffmpeg -h

Post by Dennis Perov
How can I change/specify PID value of audio/video track during/after the
encode?

You can't specify this on the ffmpeg command line. The FFmpeg mpegts mux
uses a fixed algorithm to select the PID values.

Post by Dennis Perov
Can I change PCR interval in mpeg-ts file?

You can't specify this on the ffmpeg command line. The FFmpeg mpegts mux
uses a fixed interval.

Be aware the the mpegts file output from ffmpeg is not very friendly to
set top boxes. However, software decoders can usually play the .ts
without a problem.


Mike Scheutzow
mike.scheutzow at alcatel-lucent.com

[Dennis Perov]

Post by Mike Scheutzow

Post by Dennis Perov
Gents,
I'm trying to produce mpegts file with h.264/ac3 so it plays on a STB. I
How can I specify a frame structure in .ts file like : IBBPBBP... or
IBBBPBBBP...?

Yes. -g specifies number of frames in a GOP. -bf specifies number of B
frames.
? ? ? ?ffmpeg -h

Post by Dennis Perov
How can I change/specify PID value of audio/video track during/after the
encode?

You can't specify this on the ffmpeg command line. The FFmpeg mpegts mux
uses a fixed algorithm to select the PID values.

Post by Dennis Perov
Can I change PCR interval in mpeg-ts file?

You can't specify this on the ffmpeg command line. The FFmpeg mpegts mux
uses a fixed interval.
Be aware the the mpegts file output from ffmpeg is not very friendly to
set top boxes. However, software decoders can usually play the .ts
without a problem.

Thank you for the most coherent answer.

is there an alternative to ffmpeg for MPEG2 operations (CLI and Open Source)?
I need to capture UDP feed, demux it, encode AV tracks, mux it back to
.TS preserving CC PIDs and metadata PID.

What would be a better tool to manipulate ts container demux/mux/edit PID ?

Thanks.
Dennis.

[Mike Scheutzow]

Post by Dennis Perov
Thank you for the most coherent answer.
is there an alternative to ffmpeg for MPEG2 operations (CLI and Open Source)?
I need to capture UDP feed, demux it, encode AV tracks, mux it back to
.TS preserving CC PIDs and metadata PID.
What would be a better tool to manipulate ts container demux/mux/edit PID ?

I've recently been working with h264/aac in transport stream, and every
transport stream muxer tool has lacked a critical feature or had
unacceptable bugs or both. I've tried:

FFmpeg, Rhozet, Elecard XMuxerPro (paid version), Smartlabs tsMuxeR GUI
(free version).

The lack of usefullness of the available tools for mpegts is a surprise
to me, because Transport Stream has been around for so long.

So, this means I don't have any good suggestions for existing tools to
accomplish the kind of task you describe.


Mike Scheutzow

[Baptiste Coudurier]

Hi Mike,

Post by Mike Scheutzow

Post by Dennis Perov
Thank you for the most coherent answer.
is there an alternative to ffmpeg for MPEG2 operations (CLI and Open Source)?
I need to capture UDP feed, demux it, encode AV tracks, mux it back to
.TS preserving CC PIDs and metadata PID.
What would be a better tool to manipulate ts container demux/mux/edit PID ?

I've recently been working with h264/aac in transport stream, and every
transport stream muxer tool has lacked a critical feature or had
FFmpeg, Rhozet, Elecard XMuxerPro (paid version), Smartlabs tsMuxeR GUI
(free version).
The lack of usefullness of the available tools for mpegts is a surprise
to me, because Transport Stream has been around for so long.
So, this means I don't have any good suggestions for existing tools to
accomplish the kind of task you describe.

I thought you were working to fix this :)
All your patches have been applied AFAIK, if not please ping me.

On the other, latest svn produces TS files containing H264+AAC that
works perfectly on iphone/ipad.