DAR setting

[tombert]

Hi,

I am playing with the DAR value because I have an old sony2010 and some files it stretches unnaturally. It seems that DAR woks only for mpeg files but not for mkv ... at least I do not see an effect.

I wonder why 16:9 is the only allowed value? From ffmpeg manual any floating point or x:y ratio should be possible. Any chances that this gets allowed in the profile? Or are there any reasons I am not aware of?

thx

[zip]

The only reason is that most TVs are 16:9.

It will only be invoked when you transcode, not when you remux.

[tombert]

Force Video Transcoding is enabled. I think the Problem is more my 2y old Bravia. So I wanted to play with more DAR values.

[zip]

froce video transcoding only means that if the source video codec is the same as the target on it'll still re-encode it, not just copy. You have to set targetVCodec for a file to be trancoded.

[tombert]

I think I did so:
<Video targetContainer="mpegts" targetVCodec="mpeg2video" maxVBitrate="17000" targetACodec="ac3" aBitrate="192" DAR="16:9" forceInheritance="true" forceVTranscoding="true">

[zip]

so if you check the log it should produce a 16:9 resolution video (with black bars) using the scale filter.

[tombert]

Thats the command line in the log:

  Code:

ffmpeg -threads auto -i /../mnt/raid5/media/Videos/@.Series/My Vids/test.mpeg -y -copyts -c:v mpeg2video -b:v 17000k -maxrate:v 17000k -bufsize:v 17000k -r 25 -g 15 -c:a copy -map 0:0 -map 0:1 -sn -f mpegts /tmp/Serviio/transcoding-temp-3456-sony2010-ORIGINAL.stf

I also checked the stf file - no bars to see.
Also, the input file is already 16:9:

  Code:

Input #0, mpegts, from 'test.mpeg':
  Duration: 00:20:49.76, start: 1.400000, bitrate: 3723 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), s16, 448 kb/s


My TV is stretching the movie horizontally - so thats why I thought about applying a different DAR to work around this "bug".

thx

[tombert]

With DAR=16:9 setting:
ffmpeg line:

  Code:

ffmpeg -threads auto -i /../mnt/raid5/media/Videos/test.avi -y -copyts -c:v mpeg2video -b:v 17000k -maxrate:v 17000k -bufsize:v 17000k -vf pad=854:480:107:0:black,setdar=4:3 -r 25 -g 15 -c:a ac3 -b:a 192k -ac 2 -map 0:0 -map 0:1 -sn -f mpegts /tmp/Serviio/transcoding-temp-1651-sony2010-ORIGINAL.stf

transcoded file:

  Code:

Input #0, mpegts, from '/tmp/Serviio/transcoding-temp-1651-sony2010-ORIGINAL.stf':
  Duration: 00:02:30.04, start: 1.400000, bitrate: 4144 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 854x480 [SAR 320:427 DAR 4:3], 17000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, s16, 192 kb/s

Without DAR:
ffmpeg line:

  Code:

ffmpeg -threads auto -i /../mnt/raid5/media/Videos/test.avi -y -copyts -c:v mpeg2video -b:v 17000k -maxrate:v 17000k -bufsize:v 17000k -r 25 -g 15 -c:a ac3 -b:a 192k -ac 2 -map 0:0 -map 0:1 -sn -f mpegts /tmp/Serviio/transcoding-temp-1651-sony2010-ORIGINAL.stf


transcoded file:

  Code:

Input #0, mpegts, from '/tmp/Serviio/transcoding-temp-1651-sony2010-ORIGINAL.stf':
  Duration: 00:12:57.20, start: 1.400000, bitrate: 3786 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 17000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, s16, 192 kb/s


So in real it changes the SAR value, not the DAR ... (is this intended?)

-----------------------------------------------

I got another video with the following parameters:

  Code:

Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 1920x1072 [SAR 1:1 DAR 120:67]

Which gets transcoded to (DAR=16:9):

  Code:

... -vf pad=1920:1080:0:4:black,setdar=4:3 -r 30000/1001 -g 15 ...

  Code:

Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 1920x1080 [SAR 3:4 DAR 4:3]

The transcoded video gets displayed correctly on my TV.

Another source:

  Code:

Stream #0:1[0x101]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9]

The transcoded file has the same SAR/DAR values.
The file gets horizontally stretched on my TV (bars on top and bottom).

------------------------------------------------

It looks to me that DAR is doing what I was looking for, only that it does not do it for already 16:9 files ...
Any ideas?

thx

[zip]

why would it do it for already 16:9 files?

[tombert]

I understood the DAR setting exists because some TVs show a wrong aspect ratio ... and thats how to fix it.
Nevermind ... I think I'll have to find another solution.

thx

[zip]

yes, but what this does it just resizes the frame to fit into a 16:9 box.

Hi tombert,

Did you find a solution to this?

I have a 2010 Sony and I am still having aspect ratio problems with Serviio v1+

Transcoded 16:9 files are squashed horizontally...
Mkv's of widescreen DVDs are displayed squashed vertically.

[tombert]

Only a workaround:
Go to Settings->Screen there you have a slider called "Vertical Size". This allows to stretch/shrink the picture ... its a bit better but not a final solution.
We have to blame Sony for this though ... my BD Player shows the correct aspect ratio.

It will only be invoked when you transcode, not when you remux.

What if I want to correct aspect ratio of a remuxed video?
(hopefully without transconding)

Thanks
Davide

[zip]

if you can find the ffmpeg command that works for your TV, let me know. For my experiments, mpegts will not store DAR, or some renderers won't read its value.

Hi Zip,

is your last sentence still true now?
I've seen last comment here:
https://trac.ffmpeg.org/ticket/2046
which is:

Changed 7 months ago by cehoyos
◾Component changed from undetermined to FFmpeg
◾Resolution set to fixed
◾Status changed from new to closed
The original request was implemented by Nicolas George in b1cc12d
The direct264 patchset looks very interesting nonetheless.

I am particularly interested in solving this issue because I currently need to transcode (instead of remux), due to the 16:9 effect, and this also implies that I cannot pause/rewind/forward while watching.

[zip]

In their example they are remuxing to mp4, not mpegts (which it looks like doesn't store the dar in the container level).

You could try to run the ffmpeg command manually using the latest ffmpeg, and then add to Serviio to be played natively, to see if it makes any difference for you.

[Iveky]

is it possible to add something like this:
(this is how I converted some 4:3 films to 16:9)

ffmpeg -i film.avi -vcodec libx264 -strict -2 -q 20 -vf "scale=1024:576,setdar=16:9" -aspect 16:9 output1024.mp4

important part is: -vf "scale=1024:576,setdar=16:9"

by adding scale as option from serviio, we could solve all 16:9 problems that can appear.
or will you add it in future?

[zip]

scale is already in place, but using different values. you can see that when using the DAR transcoding option (but that is not for remuxing)

[Iveky]

i searched throu profiles, none use width x height, only maxheight is implemented?
i think, forcing ffmpeg to transcode into specific WxH, we cant set it through profile?

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