VP9 formats on some YouTube videos are reported as 1fps

[ivan]

The VP9 formats on this video are reported as 1fps:

# PYTHONPATH=. python3 -m youtube_dl -F VcS6Vja2UvE
[youtube] VcS6Vja2UvE: Downloading webpage
[youtube] VcS6Vja2UvE: Downloading video info webpage
[youtube] VcS6Vja2UvE: Extracting video information
[youtube] VcS6Vja2UvE: Downloading DASH manifest
[youtube] VcS6Vja2UvE: Downloading DASH manifest
[info] Available formats for VcS6Vja2UvE:
format code  extension  resolution note
171          webm       audio only DASH audio  128k , vorbis@128k (44100Hz), 8.60MiB
140          m4a        audio only DASH audio  129k , m4a_dash container, aac  @128k (44100Hz), 9.60MiB
141          m4a        audio only DASH audio  256k , m4a_dash container, aac  @256k (44100Hz), 19.07MiB
160          mp4        256x144    DASH video  113k , avc1.4d400c, 15fps, video only, 7.76MiB
242          webm       426x240    DASH video  120k , vp9, 1fps, video only, 6.25MiB
278          webm       256x144    DASH video  141k , webm container, VP9, 1fps, video only, 2.97MiB
243          webm       640x360    DASH video  238k , vp9, 1fps, video only, 12.95MiB
133          mp4        426x240    DASH video  247k , avc1.4d4015, 30fps, video only, 18.24MiB
134          mp4        640x360    DASH video  262k , avc1.4d401e, 30fps, video only, 13.53MiB
244          webm       854x480    DASH video  461k , vp9, 1fps, video only, 25.43MiB
135          mp4        854x480    DASH video  584k , avc1.4d401f, 30fps, video only, 32.60MiB
247          webm       1280x720   DASH video  851k , vp9, 1fps, video only, 52.27MiB
136          mp4        1280x720   DASH video 1253k , avc1.4d401f, 30fps, video only, 84.96MiB
248          webm       1920x1080  DASH video 1524k , vp9, 1fps, video only, 101.05MiB
137          mp4        1920x1080  DASH video 2629k , avc1.640028, 30fps, video only, 179.45MiB
17           3gp        176x144    
36           3gp        320x240    
5            flv        400x240    
43           webm       640x360    
18           mp4        640x360    
22           mp4        1280x720   (best)

while on another video, they are correctly reported:

# PYTHONPATH=. python3 -m youtube_dl -F lZcX_ZdlW3Q
[youtube] lZcX_ZdlW3Q: Downloading webpage
[youtube] lZcX_ZdlW3Q: Downloading video info webpage
[youtube] lZcX_ZdlW3Q: Extracting video information
[youtube] lZcX_ZdlW3Q: Downloading DASH manifest
[youtube] lZcX_ZdlW3Q: Downloading DASH manifest
[info] Available formats for lZcX_ZdlW3Q:
format code  extension  resolution note
171          webm       audio only DASH audio  118k , vorbis@128k (44100Hz), 12.97MiB
140          m4a        audio only DASH audio  130k , m4a_dash container, aac  @128k (44100Hz), 16.76MiB
141          m4a        audio only DASH audio  256k , m4a_dash container, aac  @256k (44100Hz), 33.28MiB
160          mp4        256x144    DASH video  122k , avc1.4d400c, 15fps, video only, 14.18MiB
278          webm       256x144    DASH video  204k , webm container, VP9, 15fps, video only, 11.76MiB
133          mp4        426x240    DASH video  265k , avc1.4d4015, 30fps, video only, 31.86MiB
242          webm       426x240    DASH video  294k , vp9, 30fps, video only, 23.98MiB
243          webm       640x360    DASH video  508k , vp9, 30fps, video only, 44.00MiB
134          mp4        640x360    DASH video  622k , avc1.4d401e, 30fps, video only, 52.65MiB
244          webm       854x480    DASH video  922k , vp9, 30fps, video only, 78.60MiB
135          mp4        854x480    DASH video 1149k , avc1.4d401f, 30fps, video only, 102.32MiB
247          webm       1280x720   DASH video 1956k , vp9, 30fps, video only, 161.67MiB
136          mp4        1280x720   DASH video 2265k , avc1.4d401f, 30fps, video only, 201.90MiB
248          webm       1920x1080  DASH video 4039k , vp9, 30fps, video only, 315.90MiB
137          mp4        1920x1080  DASH video 4192k , avc1.640028, 30fps, video only, 421.62MiB
17           3gp        176x144    
36           3gp        320x240    
5            flv        400x240    
43           webm       640x360    
18           mp4        640x360    
22           mp4        1280x720   (best)

[jaimeMF]

Well, that's what YouTube says in the DASH manifest:

<Representation id="248" codecs="vp9" width="1920" height="1080" startWithSAP="1" bandwidth="1524301" frameRate="1">
...

What should we do?

[ivan]

Thanks. I guess there isn't much to do other than beg YouTube employees to fix it.

My bad for assuming the value was reliable.