[AG-DEV] Transcoding DVTS streams?

Piers O'Hanlon p.ohanlon at cs.ucl.ac.uk
Wed Nov 25 16:42:25 CST 2009


Hi,

In my original message I forgot to copy the most relevant gstreamer plugins:
rtp:  rtpdvdepay: RTP DV Depayloader
rtp:  rtpdvpay: RTP DV Payloader

Which should be able to do what you want....

Piers.

2009/11/25 Andrew Ford <andrew.ford at rit.edu>:
> Hi,
>
> To clarify, like others said, ffmpeg can decode the DV codec in general (ie,
> you can plug a camera in and view it) but it apparently can't depacketize
> DVTS, since when you try to receive a DVTS stream it just looks like noise.
> VLC can do neither as far as I can tell.
>
> Piers - thanks for the info, I'll give gstreamer a try.
>
> Andrew - what are you using as the backend for this transcoding tool? Is it
> all custom-written or do you rely on libraries like ffmpeg?
>
> --Andrew
>
> 2009/11/25 Piers O'Hanlon <p.ohanlon at cs.ucl.ac.uk>
>>
>> Hi Andrew,
>>
>> Another way you could probably knock something up quickly is using
>> gstreamer - v0.10 contains a DV de/payloader:
>>
>> %gst-inspect-0.10 | grep "dv:"
>> typefindfunctions: video/x-dv: dif, dv
>> dv:  dvdemux: DV system stream demuxer
>> dv:  dvdec: DV video decoder
>> ffmpeg:  ffdemux_dv: FFmpeg DV video format demuxer
>> ffmpeg:  ffmux_dv: FFmpeg DV video format muxer
>>
>> You could play with creating a pipeline using gst-launch-0.10 to do
>> what you want or you can write a small app in Python or C++ using the
>> gstreamer libraries.
>>
>> Piers
>>
>> 2009/11/24 Andrew Ford <andrew.ford at rit.edu>:
>> > Hi,
>> >
>> > Has anyone attempted or found a way to transcode a DVTS stream directly
>> > off
>> > of receiving it via multicast? My goal is to be able to transcode DVTS
>> > streams to different formats and resend them as Access Grid-based or
>> > web-based streams. So far, it looks like the only way to do it would be
>> > to
>> > modify xdvshow or one of the other DVTS apps to hook together with
>> > ffmpeg
>> > for transcoding & ffserver for streaming, since as far as I can tell,
>> > apps
>> > like ffmpeg or VLC can't receive DVTS by themselves. Before I go
>> > spending a
>> > bunch of time on that I want to make sure this hasn't already been done
>> > some
>> > other way.
>> >
>> > Thanks,
>> > --Andrew
>> >
>
>


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