gmane.comp.video.ffmpeg.user

mmsh streams and immense buffering

Patrick Cornwell — 2012-05-22T16:40:33

Hi,

 

I am a novice with FFMPEG but have over the years fudged a live streaming
service using the Windows Media format and Windows Media Services. In
hindsight, not perhaps the best course but that's where we are.

 

Myself and a few developers have been attempting to use FFMPEG to transcode
some streams for playback on different devices with some success.  The
problem comes with certain streams. For example, this stream, which works
fine in Windows Media Player or VLC:

 

http://209.105.232.35/cssaitek1

 

(I pass it in as mmsh:// within FFMPEG). The result is:

[wmv3 < at > 00000000(some random hex)] Extra data: 8 bits left, value: 0

 

which sits there for a good 3-4 minutes before any data seems to come out
the other side. Sniffing the NIC and looking at the media server stats shows
that data is flowing right from the start however, so something is holding
FFMPEG up.

 

Some streams do not do this, e.g.

 

http://209.105.232.35/csdigitaldanuk

 

(also an mmsh://)

 

These are both live feeds using t

Re: help decoding mjpeg in rtsp

Daniel Martinez Ramos — 2012-05-22T15:41:55

Sorry for the misunderstanding.
  It is not my intention to cause any disturb. I'm new here and I just 
would like to ask for some help.

I also tried to decode this stream with a modern version 0.10.3, but the 
problem looked pretty similar, so I guess it is my fault ;)

Investigating a bit more I've founded more problems like this because of 
the streamer "ingenient technologies media server", so maybe the problem 
came since I'm forcing ffmpeg to decode mjpeg instead of "ingenient 
technologies" mjpg format.

As you can see in the format list, my ffmpeg compilation seems to be 
able to decode that format
(please ignore the version)

root< at >debr:/media/samba/# ffmpeg -formats | grep ingenient
ffmpeg version 0.8.11, Copyright (c) 2000-2011 the FFmpeg developers
   built on May 22 2012 13:32:07 with gcc 4.4.5
   configuration:
   libavutil    51.  9. 1 / 51.  9. 1
   libavcodec   53.  8. 0 / 53.  8. 0
   libavformat  53.  5. 0 / 53.  5. 0
   libavdevice  53.  1. 1 / 53.  1. 1
   libavfilter   2. 23. 0 /  2. 23

Re: help decoding mjpeg in rtsp

Carl Eugen Hoyos — 2012-05-22T15:04:28


Please try current git head.

Please do not highjack threads, it is considered very rude.

Carl Eugen

help decoding mjpeg in rtsp

Daniel Martinez Ramos — 2012-05-22T14:43:25

Hi everyone

I'm trying to save a rtsp - MJPEG  stream to disk, but a kind of error 
in decoder is found:

root< at >deb:~# ffmpeg -i rtsp://192.168.101.141:665 -c:v mjpeg -na -vcodec 
copy demo.mpeg
ffmpeg version 0.8.11, Copyright (c) 2000-2011 the FFmpeg developers
   built on May 22 2012 13:32:07 with gcc 4.4.5
   configuration:
   libavutil    51.  9. 1 / 51.  9. 1
   libavcodec   53.  8. 0 / 53.  8. 0
   libavformat  53.  5. 0 / 53.  5. 0
   libavdevice  53.  1. 1 / 53.  1. 1
   libavfilter   2. 23. 0 /  2. 23. 0
   libswscale    2.  0. 0 /  2.  0. 0
[mjpeg < at > 0x9619000] Found EOI before any SOF, ignoring
[mjpeg < at > 0x9619000] No JPEG data found in image
[mjpeg < at > 0x9619000] Found EOI before any SOF, ignoring
[mjpeg < at > 0x9619000] No JPEG data found in image
[mjpeg < at > 0x9619000] Found EOI before any SOF, ignoring
[mjpeg < at > 0x9619000] No JPEG data found in image
[mjpeg < at > 0x9619000] Found EOI before any SOF, ignoring


My ffmpeg options are :

My  ffmpeg -formats enabled
.....

DE mjpeg           raw MJPEG video
....

Re: ProRes: ffmpeg vs. ffmbc

Reindl Harald — 2012-05-22T14:31:16


Am 22.05.2012 16:24, schrieb Phil Rhodes:

after all the pure trolling of you in the past it
is interesting and funny that YOU think you are
in the position to explain anybody anything about
"software engineering"


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Re: ProRes: ffmpeg vs. ffmbc

Phil Rhodes — 2012-05-22T14:24:56

Do you expect the average user to have the technical expertise to give the  
developers all the information they need?

Technical investigation of faults is part of what software engineering is.

P

Re: what will be the format of the bufferforAVFormatContext??

Mike Scheutzow — 2012-05-22T12:51:20


FFmpeg is a complex library, so there is not a short simple answer to 
your question.

Download the source code and look at the files in the doc/examples/ 
subdirectory. Those examples are not perfect, but should give you an 
idea how the different parts of ffmpeg library work together.

It's a little old, but this tutorial might help your understanding too:

http://dranger.com/ffmpeg/


Mike Scheutzow

Re: ProRes: ffmpeg vs. ffmbc

Thomas Worth — 2012-05-22T11:24:36

Carl, here's all the necessary information needed to fix this very old
and annoying bug.

This has been discussed before and the issue, as explained by Baptiste
Coudurier (who has already fixed this in ffmbc), is a problem with
ffmpeg's mov muxer writing audio chunk sizes incorrectly (or at least
not in a way Final Cut Pro wants):

http://ffmpeg.org/pipermail/ffmpeg-user/2012-March/005682.html

As Baptiste explains, "FCP expects audio chunks to be approximately
48000 samples."

Movies with co64 atoms (that is, MOVs over 4GB) do not have this
problem and do not throw the media performance warning in Final Cut
Pro. So, what this means is that audio chunk sizes are written
correctly when co64 is used (i.e. written with 64 bit offsets), just
not when 32 bit chunk offsets (stco) are written.

This is a BIG HINT for anyone who wants to fix this. I would gladly do
it, but I don't know avcodec source well enough. This fix would be
better handled by someone already familiar with avcodec source,
especially movenc.c.

what will be the format of the buffer forAVFormatContext??

Antonio Tsai — 2012-05-22T07:47:52

Dear Experts,

There is a elementary stream which will be stored in a buffer and then
coded by "flv_write_packet(AVFormatContext *s, AVPacket *pkt)". My question
is what will be the format of the very buffer to fit to the sturct of
AVFormatContext, or how should I create a buffer for it. Could anyone
please give a some advice for it.

Thank you very much.
Antonio

Re: [PATCH] vf_yadif: Fixed potential access violation on EOF.

Robert Nagy — 2012-05-22T07:16:55

Oops

Re: pixelated video after inserting a logo

Carl Eugen Hoyos — 2012-05-22T07:02:44


Command line and complete, uncut console output missing ;-)

Please do not top post here, Carl Eugen

Re: ProRes: ffmpeg vs. ffmbc

Carl Eugen Hoyos — 2012-05-22T07:01:02



Do you feel that this is sufficient for the developers to 
understand, reproduce and fix the problem?

Consider opening a report including all necessary information 
on trac.

Carl Eugen

Re: pixelated video after inserting a logo

Rossana Guerra — 2012-05-22T07:00:01

Well as I said before finally works.

ffmpeg -i video1.avi -vf "movie=md.png [logo]; [in][logo]
overlay=W-w-10:10[out]"  -b 1400k outprueba.avi

The only fact I can argue is when I use -vcode libx264 it misses
frames and the duration of the clip is less than the original.

I guess is something wrong with the avi file and some inconsistency.

Thanks

Rossana



2012/5/22 Carl Eugen Hoyos <cehoyos< at >ag.or.at>

Re: pixelated video after inserting a logo

Carl Eugen Hoyos — 2012-05-22T06:40:39


I suspect your issue should be fixed, for future questions, please 
always post the complete, uncut console output, it makes 
understanding the problems much easier.

Also consider looking at http://ffmpeg.org/download.html for 
supported versions of FFmpeg, your version may be intentionally 
broken.

Carl Eugen

Re: [PATCH] vf_yadif: Fixed potential access violation onEOF.

Carl Eugen Hoyos — 2012-05-22T06:41:28


Wrong mailing list?
;-)

Carl Eugen

Re: How do I use the HW accerlator?

Carl Eugen Hoyos — 2012-05-22T06:37:03


I can confirm that above is correct, I don't know why it does not 
work for you, I would expect that your hardware / driver 
combination is the reason.

Carl Eugen

Re: Adjusting libavdevice/v4l2.c to support V4L2controls

Carl Eugen Hoyos — 2012-05-22T06:33:43


I am sorry, but I currently have no access to my hardware that has a 
v4l2 device, meaning I cannot work on this atm.
You could try to add ioctl's to device_init() in libavdevice/v4l2.c, 
it should be easy to add options once that works. If you are unable 
to test this, you will have to wait until somebody works on it...

(Please consider opening a ticket on trac, you may point to these 
mailing list threads, but do add all information into trac.)

Sorry, Carl Eugen

Adjusting libavdevice/v4l2.c to support V4L2 controls

Goetz Dapp — 2012-05-22T00:37:02

Hi everybody,

in order to keep things a little easier to follow I have decided to
start a new thread and apologize for this doubling up. I also apologize
that I keep bringing this up, but I think it would be a very beneficial
feature for ffmpeg; VLC allows these controls but ffmpeg is far more useful.

I am still trying to find a way to control the V4L2 control IDs (eg.
http://v4l2spec.bytesex.org/spec/x542.htm,
http://v4l2spec.bytesex.org/spec/x802.htm particularly Section 1.9.6,
and http://linuxtv.org/downloads/v4l-dvb-apis/control.html, and
http://linuxtv.org/downloads/v4l-dvb-apis/extended-controls.html). I am
facing the problem that I am using two webcams with an autofocus and an
auto-white-balance, which regularly screws up the image, and makes
post-processing very difficult as both streams need to be almost identical.

In my previous email (subject: Re: [FFmpeg-user] Question about v4l2
controls and ffmpeg, also dts muxer problems) I got the following reply:

control ids through ffmpeg,
v4l2_set_para

Re: How do I use the HW accerlator?

Wayne Kelly — 2012-05-21T23:55:34

Hi nrson,

I've similarly been battling to get DXVA2 to work for H264 decoding. The following is what I've learned:

libavcodec does include some support for DXVA2, but it doesn't do all the work necessary to be able to automatically use DXVA2.
The "Player" (i.e. the program that you write to use libavcodec) needs to do half of the work. ffmpeg.exe and ffplay.exe have not been written to use DXVA2.
Everyone points to the VLC open source player as the best (only) example of how to use DXVA2 with libavcodec. Unfortunately VLC is very complex
and hard to even recompile on Windows. It would be great to have a simple/minimal player example that could demonstrate how to do it.

From what I understand the basic steps are to:
1) get ffmpeg libraries to compile with DXVA2 support enabled.
2) Create a DirectXVideoDecoderService (http://msdn.microsoft.com/en-us/library/windows/desktop/aa965245(v=vs.85).aspx#Decoding)
3) Choose a Decoder configuration and create an array of Direct3DSurfaces
3) Create a dxva_context stru

[PATCH] vf_yadif: Fixed potential access violation onEOF.

Robert Nagy — 2012-05-21T22:19:47

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Video files splitting and merging issue

Tarun singhal — 2012-05-21T18:34:37

Hi all,
As we know, unless files are in privileged raw format such as mpg, we cant
merge those files by simple binary concatenation.
I found this tool mp4box, which is able to concatenate mp4 files. Well
thats great, but the problem is it can do that for mp4 only.

One more thing ,Please correct me if i am wrong, If I am trying to cut a
segment of a 3 hrs video from 20th minute to 30th minute, ffmpeg will have
to parse the video till 20th segment and then start processing. If thats
true, then that is bad.

What I would Like to ask from community is Can somebody please let me know
following things.

1) What all formats can be stitched together by simple binary concatenation?
2) Is there any generic command line tool available which can split and
merge any formats?