MLV-files

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MLV-files

Cecil Westerhof-3
Yesterday I discovered Magic Lantern. I read that ffmpeg supports the
MLV format. Does anyone has experience with this?

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Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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Re: MLV-files

Kieran O Leary
Hi,

On Wed, Mar 29, 2017 at 9:07 PM, Cecil Westerhof <[hidden email]> wrote:

> Yesterday I discovered Magic Lantern. I read that ffmpeg supports the
> MLV format. Does anyone has experience with this?
>
> What have you tried already and what are you hoping to do? I haven't tried
MLV in years, seeing as my 650D could only do pretty much SD RAW. I
downloaded a test file from here from 2014 - MLV may have evolved since
then : https://www.magiclantern.fm/forum/index.php?topic=11899.0
and ffmpeg seems to handle it very well. I'd imagine that you might want to
make a prores version, so here's what my terminal output looked like.
There's some DTS errors which I'm not entirely sure of but the video looks
good - there could be audio sync issues if it was a longer clip with audio,
but I'm weak with things like PTS/DTS:

ffmpeg -i Downloads/5DII_14may14_blfixOFF.MLV -c:v prores prores.mov
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.3.0 (Homebrew gcc 5.3.0)
  configuration: --prefix=/home/kieranjol/.linuxbrew/Cellar/ffmpeg/3.2.4
--enable-shared --enable-pthreads --enable-gpl --enable-version3
--enable-hardcoded-tables --enable-avresample
--cc=/home/kieranjol/.linuxbrew/bin/gcc-5 --host-cflags='-Os -w -pipe
-march=native' --host-ldflags='-L/home/kieranjol/.linuxbrew/lib
-Wl,--dynamic-linker=/home/kieranjol/.linuxbrew/lib/ld.so
-Wl,-rpath,/home/kieranjol/.linuxbrew/lib' --enable-ffplay --enable-libass
--enable-libfreetype --enable-libmp3lame --enable-libx264 --enable-libx265
--enable-libxvid --disable-lzma --enable-libopenjpeg
--disable-decoder=jpeg2000
--extra-cflags=-I/home/kieranjol/.linuxbrew/Cellar/openjpeg/2.1.2/include/openjpeg-2.1
--enable-vda
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Ignoring attempt to set invalid timebase 1/0 for st:1
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mlv, from 'Downloads/5DII_14may14_blfixOFF.MLV':
  Metadata:
    guid            : 0x2b1f92591e422d93
    picStyleName    : Neutral
    isoMode         : manual
    isoValue        : 400
    isoAnalog       : 88
    digitalGain     : 0
    shutterValue    : 21348
    focalLength     : 105
    focalDist       : 70
    aperture        : 400
    stabilizerMode  : 14
    autofocusMode   : 3
    flags           : 0
    lensID          : 237
    lensName        : EF24-105mm f/4L IS USM
    cameraName      : Canon EOS 5D Mark II
    cameraModel     : 2147484184
    cameraSerial    : 8AF4F7AC
    wb_mode         : 1
    kelvin          : 5200
    wbgain_r        : 461
    wbgain_g        : 1024
    wbgain_b        : 590
    wbs_gm          : 0
    wbs_ba          : 4294967292
    picStyleId      : 132
    contrast        : 4294967292
    sharpness       : 2
    saturation      : 4294967294
    colortone       : 0
    time            : 2014-05-16 01:52:13
  Duration: 00:00:00.67, start: 0.000000, bitrate: 732719 kb/s
    Stream #0:0: Video: rawvideo (BIT[16] / 0x10544942), bayer_rggb16le,
1856x1044, 23.98 tbr, 23.98 tbn, 23.98 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
stereo, s16, 1536 kb/s
[prores @ 0x1e99a00] encoding with ProRes standard (apcn) profile
[prores @ 0x1e9e3e0] encoding with ProRes standard (apcn) profile
[prores @ 0x1ea3000] encoding with ProRes standard (apcn) profile
[prores @ 0x1ea7d20] encoding with ProRes standard (apcn) profile
[prores @ 0x1dd2b40] encoding with ProRes standard (apcn) profile
Output #0, mov, to 'prores.mov':
  Metadata:
    guid            : 0x2b1f92591e422d93
    picStyleName    : Neutral
    isoMode         : manual
    isoValue        : 400
    isoAnalog       : 88
    digitalGain     : 0
    shutterValue    : 21348
    focalLength     : 105
    focalDist       : 70
    aperture        : 400
    stabilizerMode  : 14
    autofocusMode   : 3
    flags           : 0
    lensID          : 237
    lensName        : EF24-105mm f/4L IS USM
    cameraName      : Canon EOS 5D Mark II
    cameraModel     : 2147484184
    cameraSerial    : 8AF4F7AC
    wb_mode         : 1
    kelvin          : 5200
    wbgain_r        : 461
    wbgain_g        : 1024
    wbgain_b        : 590
    wbs_gm          : 0
    wbs_ba          : 4294967292
    picStyleId      : 132
    contrast        : 4294967292
    sharpness       : 2
    saturation      : 4294967294
    colortone       : 0
    time            : 2014-05-16 01:52:13
    encoder         : Lavf57.56.101
    Stream #0:0: Video: prores (apcn / 0x6E637061), yuv422p10le, 1856x1044,
q=2-31, 200 kb/s, 23.98 fps, 11988 tbn, 23.98 tbc
    Metadata:
      encoder         : Lavc57.64.101 prores
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s
    Metadata:
      encoder         : Lavc57.64.101 aac
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> prores (native))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0x1de7e60] Queue input is backward in time
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9216,
current: 641; changing to 9217. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9217,
current: 1665; changing to 9218. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9218,
current: 2689; changing to 9219. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9219,
current: 3713; changing to 9220. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9220,
current: 4737; changing to 9221. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9221,
current: 5761; changing to 9222. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9222,
current: 6785; changing to 9223. This may result in incorrect timestamps in
the output file.
[aac @ 0x1de7e60] Queue input is backward in time
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9223,
current: 7809; changing to 9224. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9224,
current: 8833; changing to 9225. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9225,
current: 257; changing to 9226. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9226,
current: 1281; changing to 9227. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9227,
current: 2305; changing to 9228. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9228,
current: 3329; changing to 9229. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9229,
current: 4353; changing to 9230. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9230,
current: 5377; changing to 9231. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9231,
current: 6401; changing to 9232. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9232,
current: 7425; changing to 9233. This may result in incorrect timestamps in
the output file.
[mov @ 0x1dd11c0] Non-monotonous DTS in output stream 0:1; previous: 9233,
current: 8449; changing to 9234. This may result in incorrect timestamps in
the output file.
frame=    4 fps=0.0 q=-0.0 Lsize=    2047kB time=00:00:00.21
bitrate=76666.9kbits/s speed=0.407x
video:2036kB audio:10kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.073966%
[aac @ 0x1de7e60] Qavg: 161.729
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Re: MLV-files

Cecil Westerhof-3
On Thursday 30 Mar 2017 23:45 CEST, Kieran O. Leary wrote:

> Yesterday I discovered Magic Lantern. I read that ffmpeg supports
> the
> MLV format. Does anyone has experience with this?
>
> What have you tried already and what are you hoping to do? I haven't
> tried MLV in years, seeing as my 650D could only do pretty much SD
> RAW. I downloaded a test file from here from 2014 - MLV may have
> evolved since then :

Not much. With ffmpeg -codecs I did not see anything that seemed to
work with MLV. And because all references where a few years old I was
afraid it was a stillborn child. And because I needed to implement
some changes before I could (my system does not recognise ExFAT at the
moment) I wanted at least an indication that my work would not be in
vain. ;-)

I am going to dive into it. Thanks.

It is mostly that I want to bypass the 30 minute limit. But I
understood that you could also get much better results. So I will dive
in that also.

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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Re: MLV-files

Moritz Barsnick
On Fri, Mar 31, 2017 at 12:11:56 +0200, Cecil Westerhof wrote:
> Not much. With ffmpeg -codecs I did not see anything that seemed to
> work with MLV.

From what I can tell, that which ffmpeg supports is a format and not a
codec - check "ffmpeg -formats". The codec may be something different
inside?

Do you have samples you can share? (I'm too lazy to google.)

Moritz, not the slightest idea about MLV. ;)
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Re: MLV-files

Kieran O Leary
Hi Moritz,

On Fri, Mar 31, 2017 at 3:01 PM, Moritz Barsnick <[hidden email]> wrote:

> On Fri, Mar 31, 2017 at 12:11:56 +0200, Cecil Westerhof wrote:
> > Not much. With ffmpeg -codecs I did not see anything that seemed to
> > work with MLV.
>
> From what I can tell, that which ffmpeg supports is a format and not a
> codec - check "ffmpeg -formats". The codec may be something different
> inside?
>
> Do you have samples you can share? (I'm too lazy to google.)
>
>

I linked to a sample in my reply. The codec seems to just be 16-bit
RAW bayer_rggb16le
- though I'm pretty sure Canon DSLRs capture images at 12 or  14-bit.
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Re: MLV-files

Moritz Barsnick
On Fri, Mar 31, 2017 at 18:31:36 +0100, Kieran O Leary wrote:
> > From what I can tell, that which ffmpeg supports is a format and not a
> > codec - check "ffmpeg -formats". The codec may be something different
> > inside?
> > Do you have samples you can share? (I'm too lazy to google.)

> I linked to a sample in my reply. The codec seems to just be 16-bit
> RAW bayer_rggb16le
> - though I'm pretty sure Canon DSLRs capture images at 12 or  14-bit.

Ah, sorry, I though Cecil was looking for the mlv codec, while he was
actually looking for the appropriate raw codec.

Indeed, decoding some samples (7D_14may14_blfixOFF.MLV) doesn't look
right, out of the box.

At this point, as it seems to be (guessing) "yet another raw format",
tools specialized on raw formats might be a better choice right now.
Though I prefer if ffmpeg supported "everything". ;)

Moritz
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Re: MLV-files

Cecil Westerhof-3
In reply to this post by Kieran O Leary
On Friday 31 Mar 2017 19:31 CEST, Kieran O. Leary wrote:

>>> Not much. With ffmpeg -codecs I did not see anything that seemed
>>> to work with MLV.
>>
>> From what I can tell, that which ffmpeg supports is a format and
>> not a codec - check "ffmpeg -formats". The codec may be something
>> different inside?
>>
>> Do you have samples you can share? (I'm too lazy to google.)
>>
>>
>
> I linked to a sample in my reply. The codec seems to just be 16-bit
> RAW bayer_rggb16le - though I'm pretty sure Canon DSLRs capture
> images at 12 or 14-bit.

The site of Magic Lantern says it is 14 bits.

--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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Re: MLV-files

Carl Eugen Hoyos-2
In reply to this post by Moritz Barsnick
2017-03-31 20:42 GMT+02:00 Moritz Barsnick <[hidden email]>:

> Indeed, decoding some samples (7D_14may14_blfixOFF.MLV)
> doesn't look right, out of the box.

Saturation (and contrast?) have to be adjusted with some existing
filters (lut?), the metadata should tell you more.

Carl Eugen
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Re: MLV-files

rafuxaelbj
This post has NOT been accepted by the mailing list yet.
In reply to this post by Cecil Westerhof-3
I believe ffmpeg supports MLV format. I'm doing some tests and as soon as I finish I'll post on the site https://www.empregabrasil.com.br notice here
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