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  1. Member
    Join Date
    Dec 2018
    Location
    United States
    Search PM
    Hi, I need to download a video in its highest quality available. The Host has two 2 different format menifest.mpd and menefest.m3u8.

    menifest.mpd


    Code:
    format code  extension  resolution note
    1            m4a        audio only DASH audio   65k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    11           m4a        audio only DASH audio   65k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    3            m4a        audio only DASH audio   65k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    5            m4a        audio only DASH audio   65k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    7            m4a        audio only DASH audio   65k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    9            m4a        audio only DASH audio   65k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    13           m4a        audio only DASH audio   97k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    15           m4a        audio only DASH audio   97k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    17           m4a        audio only DASH audio   97k , m4a_dash container, mp4a.4
    0.2 (44100Hz)
    0            mp4        320x180    DASH video  149k , mp4_dash container, avc1.4
    2c015, video only
    2            mp4        480x270    DASH video  394k , mp4_dash container, avc1.4
    2c015, video only
    4            mp4        640x360    DASH video  588k , mp4_dash container, avc1.4
    2c01e, video only
    6            mp4        640x360    DASH video  836k , mp4_dash container, avc1.4
    2c01e, video only
    8            mp4        1024x576   DASH video 1157k , mp4_dash container, avc1.4
    2c01f, video only
    10           mp4        1024x576   DASH video 1753k , mp4_dash container, avc1.4
    2c01f, video only
    12           mp4        1280x720   DASH video 2090k , mp4_dash container, avc1.4
    d401f, video only
    14           mp4        1280x720   DASH video 2933k , mp4_dash container, avc1.4
    d401f, video only
    16           mp4        1920x1080  DASH video 3810k , mp4_dash container, avc1.4
    d4028, video only (best)


    menifest.m3u8


    Code:
    format code              extension  resolution note
    audio-aacl-64-English-0  mp4        audio only [en]
    audio-aacl-64-English-1  mp4        audio only [en]
    audio-aacl-64-English-2  mp4        audio only [en]
    audio-aacl-64-English-3  mp4        audio only [en]
    audio-aacl-64-English-4  mp4        audio only [en]
    audio-aacl-64-English-5  mp4        audio only [en]
    audio-aacl-96-English-0  mp4        audio only [en]
    audio-aacl-96-English-1  mp4        audio only [en]
    audio-aacl-96-English-2  mp4        audio only [en]
    244                      mp4        320x180     244k , avc1.42C015, video only
    276                      mp4        320x180     276k , avc1.42C015, video only
    495                      mp4        480x270     495k , avc1.42C015, video only
    527                      mp4        480x270     527k , avc1.42C015, video only
    692                      mp4        640x360     692k , avc1.42C01E, video only
    724                      mp4        640x360     724k , avc1.42C01E, video only
    946                      mp4        640x360     946k , avc1.42C01E, video only
    978                      mp4        640x360     978k , avc1.42C01E, video only
    1274                     mp4        1024x576   1274k , avc1.42C01F, video only
    1306                     mp4        1024x576   1306k , avc1.42C01F, video only
    1883                     mp4        1024x576   1883k , avc1.42C01F, video only
    1915                     mp4        1024x576   1915k , avc1.42C01F, video only
    2227                     mp4        1280x720   2227k , avc1.4D401F, video only
    2259                     mp4        1280x720   2259k , avc1.4D401F, video only
    3089                     mp4        1280x720   3089k , avc1.4D401F, video only
    3121                     mp4        1280x720   3121k , avc1.4D401F, video only
    3985                     mp4        1920x1080  3985k , avc1.4D4028, video only
    4017                     mp4        1920x1080  4017k , avc1.4D4028, video only (best)
    Now I have downloaded both videos and converted the into mp4.

    Code:
    Used mpd Format. After conversation to mp4 file size: 632 MB
    Used m3u8 Format. After conversation to mp4 file size: 543 MB
    So now i didn't understand which is the best quality 1920x1080 4017k or 1920x1080 DASH video 3810k

    Please Help Me
    Thanks


    Edwin B
    Last edited by EdwinB; 9th Dec 2018 at 00:31. Reason: Updated
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  2. Member Cornucopia's Avatar
    Join Date
    Oct 2001
    Location
    Deep in the Heart of Texas
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    Quality is not just about resolution, nor just about bitrate, etc., but a combination of detail and fidelity.
    You don't know whether the settings for the one format are equivalent to the settings for the other, nor do you know whether they are even consistent WITHIN the formats.
    If bitrate were correspondingly and accordingly increased along with the increase in resolution, then -all else being equal- the highest bitrated 1080p stream would be best. As it is, it could very well be that the highest 720p is best overall because the 1080s aren't that much higher in bitrate to accommodate the increase in rez, so they are a bit "bitrate starved", and so might exhibit increased artifacts compared to the highest 720p version.

    Then you add in "conversion", and I'm not sure your process is simply remuxing - it could be recompressing. Which both worsens the quality and muddies the waters AFA determination.

    So, from what you have given us, it is very hard to tell.

    Scott
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  3. Member
    Join Date
    Mar 2011
    Location
    Nova Scotia, Canada
    Search Comp PM
    Originally Posted by Cornucopia View Post
    Quality is not just about resolution, nor just about bitrate, etc., but a combination of detail and fidelity.[
    That's really true and quality is a bit subjecctive. Some people seem to just look for sharp edges and overlook artifacts. I'll gladly sacrifice a bit of sharpness for consistency. And I've found that once you've seen 10 bit ccolor it's hard to go back.
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