SAR and DAR the same for anamorphic? Incorrect?

[flamingspew]

Summary of the bug: SAR and DAR are incorrect
How to reproduce:
Please see question on stack overflow:
​http://stackoverflow.com/questions/17353387/how-to-detect-anamorphic-video-with-ffprobe

-print_format json -show_format -show_streams {originalFilePath}
ffprobe version N-54233-g86190af built on Jun 27 2013

"Output{
    \"streams\": [
        {
            \"index\": 0,
            \"codec_name\": \"h264\",
            \"codec_long_name\": \"H.264/AVC/MPEG-4AVC/MPEG-4part10\",
            \"profile\": \"Main\",
            \"codec_type\": \"video\",
            \"codec_time_base\": \"1/5994\",
            \"codec_tag_string\": \"avc1\",
            \"codec_tag\": \"0x31637661\",
            \"width\": 1280,
            \"height\": 720,
            \"has_b_frames\": 0,
            \"sample_aspect_ratio\": \"0: 1\",
            \"display_aspect_ratio\": \"0: 1\",
            \"pix_fmt\": \"yuv420p\",
            \"level\": 31,
            \"r_frame_rate\": \"2997/100\",
            \"avg_frame_rate\": \"2997/100\",
            \"time_base\": \"1/2997\",
            \"start_pts\": 0,
            \"start_time\": \"0.000000\",
            \"duration_ts\": 204100,
            \"duration\": \"68.101435\",
            \"bit_rate\": \"3894381\",
            \"nb_frames\": \"2041\",
            \"disposition\": {
                \"default\": 0,
                \"dub\": 0,
                \"original\": 0,
                \"comment\": 0,
                \"lyrics\": 0,
                \"karaoke\": 0,
                \"forced\": 0,
                \"hearing_impaired\": 0,
                \"visual_impaired\": 0,
                \"clean_effects\": 0,
                \"attached_pic\": 0
            },
            \"tags\": {
                \"creation_time\": \"2013-05-0318: 33: 37\",
                \"language\": \"eng\",
                \"handler_name\": \"AppleAliasDataHandler\"
            }
        },
        {
            \"index\": 1,
            \"codec_name\": \"aac\",
            \"codec_long_name\": \"AAC(AdvancedAudioCoding)\",
            \"codec_type\": \"audio\",
            \"codec_time_base\": \"1/44100\",
            \"codec_tag_string\": \"mp4a\",
            \"codec_tag\": \"0x6134706d\",
            \"sample_fmt\": \"fltp\",
            \"sample_rate\": \"44100\",
            \"channels\": 2,
            \"bits_per_sample\": 0,
            \"r_frame_rate\": \"0/0\",
            \"avg_frame_rate\": \"0/0\",
            \"time_base\": \"1/44100\",
            \"start_pts\": 0,
            \"start_time\": \"0.000000\",
            \"duration_ts\": 3003392,
            \"duration\": \"68.104127\",
            \"bit_rate\": \"125304\",
            \"nb_frames\": \"2933\",
            \"disposition\": {
                \"default\": 0,
                \"dub\": 0,
                \"original\": 0,
                \"comment\": 0,
                \"lyrics\": 0,
                \"karaoke\": 0,
                \"forced\": 0,
                \"hearing_impaired\": 0,
                \"visual_impaired\": 0,
                \"clean_effects\": 0,
                \"attached_pic\": 0
            },
            \"tags\": {
                \"creation_time\": \"2013-05-0318: 33: 37\",
                \"language\": \"eng\",
                \"handler_name\": \"AppleAliasDataHandler\"
            }
        }
    ],
    \"format\": {
        \"filename\": \"\\\\\\\\dell690\\\\vsf\\\\_asset_intake\\\\v2\\\\ed69c939-4fe1-40dd-a045-db72ed2e0009\\\\original\\\\USTC_Overview2.mov\",
        \"nb_streams\": 2,
        \"format_name\": \"mov,
        mp4,
        m4a,
        3gp,
        3g2,
        mj2\",
        \"format_long_name\": \"QuickTime/MOV\",
        \"start_time\": \"0.000000\",
        \"duration\": \"68.100000\",
        \"size\": \"34267583\",
        \"bit_rate\": \"4025560\",
        \"tags\": {
            \"major_brand\": \"qt\",
            \"minor_version\": \"537199360\",
            \"compatible_brands\": \"qt\",
            \"creation_time\": \"2013-05-0318: 33: 37\"
        }
    }
}"

[flamingspew]

Here is a link to a test video that seems anamorphic.

​http://foreverscape.com/anamorphic_test.mov

[Carl Eugen Hoyos]

Why do you think that what ffprobe shows is incorrect?

[flamingspew]

Shouldn't it say 1:1 for square?

Also, when I converted with normal scale params, it was stretched-- So i tried this to fix it:

--custom-anamorphic --display-width 1280 --keep-display-aspect --modulus 8 --crop 0:0:0:0

and it made the aspect work. That bit of CLI command I found when trying to fix anamorphic ratios. Is this video not really anamorphic?

Also, the sample_aspect_ratio and the display_aspect_ratio are the same here, but I suspect they are really not for this video.

[flamingspew]

Updated my comment to provide correct code that 'fixed' anamorphic problems.

[Carl Eugen Hoyos]

Replying to flamingspew:

Shouldn't it say 1:1 for square?

Afaict, the file does not contain any aspect information (but this may of course be wrong, that is why I asked you why you think what ffprobe shows is wrong).

Also, when I converted with normal scale params, it was stretched

Please provide your failing command line together with the complete, uncut console output.

Also, the sample_aspect_ratio and the display_aspect_ratio are the same here, but I suspect they are really not for this video.

They are the same because both are not set.

[flamingspew]

To get info:

-print_format json -show_format -show_streams {originalPath}

To Convert and Fix for Aspect Problem:

convertParams = " --input \"" + sourceFilePath + "\" --ipod-atom --width 1280 --custom-anamorphic --display-width 1280 --keep-display-aspect --modulus 8 --crop 0:0:0:0 --optimize --encoder x264 --aencode faac --ab 128 --mixdown stereo --rate 29.97 --cfr --vb " + keyPair.Value + " --output " + path;

[Carl Eugen Hoyos]

If conversion with FFmpeg leads to a file with incorrect aspect please provide the (exact) command line that produces the incorrect output for you together with the complete, uncut console output.

[flamingspew]

Thanks for bearing with me.

Oh man, just looked through 3 repositories and 20 different versions-- can't find the original offending CLI command. I'm downgrading to minor until I can reproduce.

I guess then 0:1 means not set, definitively then, correct? If that is so, I will close unless I can reproduce.

[Carl Eugen Hoyos]

Afaict, the file does not specify a sample aspect ratio and FFmpeg does not show an aspect ratio.
Please reopen if you believe anything can be fixed in FFmpeg about this sample.