[Elphel-support] broken files from footage?

[flavio soares]

Hi, Oleg, thanks again for the support!

I tried the script with the mkv but no success. I am uploading a small
mkv (75MB) for you to see. I guess you are right: ffmpeg probably
change the headers.

With this file I'm uploading, the same cenario occurs: the php script
won't split it; ffmpeg does but then movie2dng won't convert the files
and elphel_dng does convert it but with the colors shifted. I mean to
say: probably, this is what happen to any .mkv file if we use this
workflow (with ffmpeg).

Now, it just occured to me. This may have nothing to do with the
problem, but may also be the cause of it. To watch the stream of the
video (and recording it, in this case), I'm using this line:

gst-launch-0.10 rtspsrc location=rtsp://192.168.1.9:554
protocols=0x00000001 latency=100 ! rtpjpegdepay ! tee name=raw_tee !
queue ! jpegdec ! queue ! jp462bayer ! "video/x-raw-bayer,
width=(int)$NEW_WIDTH, height=(int)$NEW_HEIGHT, format=(string)gbrg" !
queue ! bayer2rgb2 method=0 ! ffmpegcolorspace ! queue ! autovideosink
raw_tee. ! queue ! videorate ! "image/jpeg, width=(int)2304,
height=(int)960, framerate=(fraction)24/1" ! matroskamux ! filesink
location=$FOLDER/s06b_t1_$FILE_NUMBER.mkv -e

The important thing on it is that since the camera was upside down,
notice I had to change this line to "format=(string)gbrg" as shown
above. Otherwise, the colors would change in the stream, the red and
blue channels. I guess the original line was "format=(string)grbg" (r
and b changed).

I thought that this affected only the stream I was watching but not
recording. However, I have just checked now that the script I made to
play the .mkv recorded videos reads as follows:

gst-launch-0.10 filesrc location=$VIDEO ! decodebin ! ffmpegcolorspace
! queue ! jp462bayer ! "video/x-raw-bayer, width=(int)$DISP_WIDTH,
height=(int)$DISP_HEIGHT, format=(string)gbrg" ! queue ! bayer2rgb2
method=1 ! queue ! ffmpegcolorspace ! xvimagesink;

It also contains the info "format=(string)gbrg", meaning I have to
re-shift the colors to watch it.

Maybe elphel_dng is just working fine and the original footage is the
one that is shifted? If so, I might have to find a way of doing this
on conversion - maybe even by re-playing the file with GStreamer while
re-dumping the video, with the color channels r and b back to place?

(the video has just finished uploading)

thanks again!

2012/11/17, Oleg <support-list at support.elphel.com>:
> Flavio,
>
> Looks like ffmpeg puts (at least) its own headers into the
> files: "JFIF Lavc52.123.0..." - this causes the wrong conversion.
>
> I don't know whether an *.mkv file has full frames inside (most likely it's
> not)
>
> If it does then
> split_mov_2.php<http://community.elphel.com/files/php_scripts/split_mov_2.php.txt>can
> split it.
> If not - the solution might be replacing the headers with the ones from the
> correct footage.
>
> Could you also upload an mkv sample?
>
> Regards,
> Oleg
>
> On 17 November 2012 11:21, flavio soares <qazav3.0 at gmail.com> wrote:
>
>> No success here... =/
>>
>> I uploaded two files to elphel's ftp (folder Videos). I used ffmpeg to
>> convert a mkv file to a series of jpegs. One of them is the jpg, the
>> other is just the jpg renamed to jp4. If I use elphel_dng to convert
>> them to dng, the colors shift completely. I can't seem to make
>> movie2dng work with them however...
>>
>> Of all the scenes, this is the one I'd like to save the most. Any hints?
>>
>> thanks again for all the help!
>>
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>>
>