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• youtube-dl, is there a way to extract the "specific format" video URL ? [closed]

  29 juillet 2020, par karma

  Following my question before in this link,
  
It seems that the copied version is from the highest resolution format, as the resulting video portion is 1920x1080 resolution.

  


  The available format :

  


  C:\Standalone Program\YoutubeDL>youtube-dl -F https://www.youtube.com/watch?v=kGDgGsrA78s
[youtube] kGDgGsrA78s: Downloading webpage
[info] Available formats for kGDgGsrA78s:
format code  extension  resolution note
249          webm       audio only tiny   52k , opus @ 50k (48000Hz), 7.49MiB
250          webm       audio only tiny   65k , opus @ 70k (48000Hz), 9.45MiB
251          webm       audio only tiny  114k , opus @160k (48000Hz), 17.07MiB
140          m4a        audio only tiny  164k , m4a_dash container, mp4a.40.2@128k (44100Hz), 21.06MiB
278          webm       256x144    144p  103k , webm container, vp9, 30fps, video only, 15.78MiB
160          mp4        256x144    144p  117k , avc1.4d400c, 30fps, video only, 12.96MiB
242          webm       426x240    240p  231k , vp9, 30fps, video only, 33.40MiB
133          mp4        426x240    240p  254k , avc1.4d4015, 30fps, video only, 25.10MiB
243          webm       640x360    360p  420k , vp9, 30fps, video only, 60.81MiB
134          mp4        640x360    360p  652k , avc1.4d401e, 30fps, video only, 61.92MiB
244          webm       854x480    480p  781k , vp9, 30fps, video only, 105.14MiB
135          mp4        854x480    480p 1190k , avc1.4d401f, 30fps, video only, 114.76MiB
247          webm       1280x720   720p 1550k , vp9, 30fps, video only, 211.07MiB
136          mp4        1280x720   720p 2383k , avc1.4d401f, 30fps, video only, 213.18MiB
248          webm       1920x1080  1080p 2752k , vp9, 30fps, video only, 408.32MiB
137          mp4        1920x1080  1080p 4443k , avc1.640028, 30fps, video only, 435.80MiB
18           mp4        640x360    360p  640k , avc1.42001E, 30fps, mp4a.40.2@ 96k (44100Hz), 106.07MiB (best)


  


  So after I do :

  


  youtube-dl -g https://www.youtube.com/watch?v=kGDgGsrA78s


  


  and the video URL result :

  


  https://r2---sn-uigxxi0ujipnvo-q2ne.googlevideo.com/videoplayback?expire=1596034295&ei=lzghX6SHKMOD8QPlx5SQBw&ip=223.255.228.87&id=o-AK6cYo88zJXe5Xb4y1QsXspuRnVCy-zPFpMaHcAaTQ-_&itag=137&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&source=youtube&requiressl=yes&mh=DA&mm=31%2C29&mn=sn-uigxxi0ujipnvo-q2ne%2Csn-npoe7nlz&ms=au%2Crdu&mv=m&mvi=2&pl=24&initcwndbps=173750&vprv=1&mime=video%2Fmp4&gir=yes&clen=456970484&dur=1389.955&lmt=1521825834085900&mt=1596012582&fvip=5&keepalive=yes&fexp=23883098&c=WEB&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRgIhAMvZrHYvC1YrkvtARzhjyD8dnMnlefobGrOFM1rX6QZPAiEAqqeIsKdZ19y-SlHf-l8YwTx2yYbo1p5sFlVoC87oXEQ%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgAIwAVMPrcMhAL476uN_ZzWj8vKPGGW58KCpHBYBsKeICICRgVWgthNvgbGl8VgQwscjJ0n8ib4XBNjRxRgSg2T5r&ratebypass=yes


  


  I think the URL is for :

  


  137          mp4        1920x1080  1080p 4443k , avc1.640028, 30fps, video only, 435.80MiB


  


  Since I want a smaller file size, I wonder if it's possible to get the video URL (for example) for :

  


  243          webm       640x360    360p  420k , vp9, 30fps, video only, 60.81MiB


  


  So then later when I feed the URL to ffmpeg to extract some portion of that lower quality video URL, the result has a smaller file size.

  


  Any kind of help would be greatly appreciated.
Thank you in advanced.

  


  BTW, I use Windows 10 command prompt (administrator).

  


• Which is the best way to encode videos into multiple resolutions in django ? Should we create a single celery task or to have multiple tasks to encode ? [closed]

  13 septembre 2020, par Danny

  Hey guys Which is the best way to encode videos using ffmpeg into multiple resolutions in django ? Should we create a single celery task which encodes the video and save in database or to have multiple tasks to encode video into various resolutions ? I am new to all these, so any help regarding the best way is highly appreciated.

  


  I have two tasks here to encode into 480 and 1080p..so is it possible to run both in 1 task or the best way is to encode separately ??

  


  Also how does websites like youtube encode ?

  


  @task(name= 'task_video_encoding_480p')
def task_video_encoding_480p(video_id):
    logger.info('Video Processing started')
    try:
        video = 
        input_file_path = 
        output_file_480p_path = 

        for i in range(1):
            new_video_480p = subprocess.call([ffmpeg, {process},output_file_480p_path])

        if new_video_480p == 0:

            video.save()
            logger.info('Video Processing Finished')
            #video.temp_file.delete()
        else:
            logger.info('Proceesing Failed.') # Just for now

    except:
        raise ValidationError('Something went wrong!')


  


  task 2

  


  @task(name= 'task_video_encoding_1080p')
def task_video_encoding_1080p(video_id):
    logger.info('Video Processing started')
    try:
        video = 
        input_file_path = 
        output_file_1080p_path = 

        for i in range(1):
            new_video_1080p = subprocess.call([ffmpeg, {process},output_file_1080p_path])

        if new_video_1080p == 0:

            video.save()
            logger.info('Video Processing Finished')
            video.temp_file.delete()
        else:
            logger.info('Proceesing Failed.') # Just for now

    except:
        raise ValidationError('Something went wrong!')


  


  Thank you. Highly appreciate the help.

  


• Artifacts in ffmpeg fifo, low fps, stream ends

  11 août 2020, par Ben Gardner

  I'm using a Raspberry Pi 3B and 4 for this, neither works.

  


  I'm trying to both pass my capture card's input (/dev/video0) through a fifo file so I can play it on the screen via omxplayer (1080p/30fps), and also grab frames of /dev/video0 out to a series of jpgs (1920x1080 right now, but I'd like it to be 640x480) so I can do analysis on it while it's being played. The input to the capture card is television via HDMI.

  


  This is the command I use to make the stream go to the fifo and jpgs.

  


  ffmpeg -y -f v4l2 -input_format mjpeg -framerate 30 -video_size 1920x1080 \
-thread_queue_size 16384 -i /dev/video0 -f alsa -ac 1 \
-thread_queue_size 16384 -i hw:CARD=U0x534d0x2109,DEV=0 \
-c:v copy -b:v 32000k -preset faster -x264opts keyint=50 \
-g 25 -pix_fmt yuvj422p -c:a aac -b:a 128k -codec:v copy -f tee \
-map 0:v -map 1:a "fifo.mkv|output_%3d.jpg"


  


  Here is my output, which gives me 30fps originally, sometimes dipping into 29-28 fps, and then skipping (both audio and video) and artifacts in the video after around 5-10 minutes with the severity eventually increasing until it stops :

  


  [mjpeg @ 0x1504490] EOI missing, emulating
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 27151.039849, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, alsa, from 'hw:CARD=U0x534d0x2109,DEV=0':
  Duration: N/A, start: 1596773777.825328, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 96000 Hz, mono, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, tee, to 'fifo.mkv|output_%3d.jpg':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, q=2-31, 32000 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
    Stream #0:1: Audio: aac (LC), 96000 Hz, mono, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.35.100 aac
[alsa @ 0x1507300] Thread message queue blocking; consider raising the thread_queue_size option (current value: 16384)
[alsa @ 0x1507300] ALSA buffer xrun.time=00:13:55.89 bitrate=N/A speed=0.972x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:14:16.02 bitrate=N/A speed=0.974x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:14:27.25 bitrate=N/A speed=0.972x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:14:33.35 bitrate=N/A speed=0.97x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:14:44.71 bitrate=N/A speed=0.969x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:14:49.71 bitrate=N/A speed=0.97x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:01.51 bitrate=N/A speed=0.967x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:07.78 bitrate=N/A speed=0.969x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:14.27 bitrate=N/A speed=0.962x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:26.44 bitrate=N/A speed=0.96x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:32.40 bitrate=N/A speed=0.96x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:38.63 bitrate=N/A speed=0.963x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:45.60 bitrate=N/A speed=0.959x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:15:50.93 bitrate=N/A speed=0.957x
    Last message repeated 1 times
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:00.79 bitrate=N/A speed=0.951x
    Last message repeated 1 times
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:05.29 bitrate=N/A speed=0.949x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:07.19 bitrate=N/A speed=0.949x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:11.72 bitrate=N/A speed=0.945x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:16.02 bitrate=N/A speed=0.944x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:26.39 bitrate=N/A speed=0.953x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:30.22 bitrate=N/A speed=0.938x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:30.98 bitrate=N/A speed=0.937x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:37.66 bitrate=N/A speed=0.941x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:41.28 bitrate=N/A speed=0.935x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:42.95 bitrate=N/A speed=0.934x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:45.82 bitrate=N/A speed=0.933x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:46.76 bitrate=N/A speed=0.932x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:47.05 bitrate=N/A speed=0.931x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:50.74 bitrate=N/A speed=0.927x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:57.05 bitrate=N/A speed=0.927x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:16:58.91 bitrate=N/A speed=0.927x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:17:09.41 bitrate=N/A speed=0.92x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:17:12.04 bitrate=N/A speed=0.917x
[alsa @ 0x1507300] ALSA buffer xrun.time=00:17:12.61 bitrate=N/A speed=0.916x
Killed31579 fps= 28 q=-1.0 size=N/A time=00:17:32.56 bitrate=N/A speed=0.919x


  


  I also occasionally get this error :

  


  [tee @ 0x17001c0] Non-monotonous DTS in output stream 0:1; previous: 99251754, current: 99247503; changing to 99251755. This may result in incorrect timestamps in the output file.


  


  I'm assuming this has something to do with the audio getting routed to the jpg. I've tried [select=\'v\'] in front of the jpg, which doesn't change the behavior as well as [map=\'1\:a\'] in front of the mkv, which says [matroska @ 0xe446f0] Unknown option 'map'.

  


  I should also disclaim that I don't have much of an idea of what this command is doing compression-wise, I basically just copy/pasted that part.

  


  What edits do I need to make to get this into a fifo and series of jpgs at the same time ?