hard to decode video to decklink output
Federico Allegretti
allegfede at gmail.com
Wed Apr 3 17:29:04 UTC 2019
seems to be the "interlace field-pattern=2:2" to generate the problem.
without it video runs smooth on autovideosink (and audioaudiosink), but
have to change decklink mode to mode=5 (sd pal 50p).
PS: in this case i have black and white images :-(
On Wed, 3 Apr 2019 at 19:14, Federico Allegretti <allegfede at gmail.com>
wrote:
> kind replay of Ray Tiley solved the issue.
> I workaround also the interlace/progressive input problem looking the
> blackmagic forum for a my old post, so now the pipeline is (sd pal
> interlaced=decklink mode 3)
> "uridecodebin uri=file://Path/of/video/file name=decode decode. !
> deinterlace ! autovideoconvert ! interlace field-pattern=2:2 ! videoconvert
> ! video/x-raw,format=UYVY ! videoscale ! video/x-raw,width=720,height=576 !
> videorate ! video/x-raw,framerate=25/1 ! decklinkvideosink mode=3 decode. !
> audioconvert ! audio/x-raw, format=S32LE, channels=2 ! audioresample !
> decklinkaudiosink"
>
> and is quite perfect, but i have some problems with (at most) mpeg2 videos.
>
> Some will be played with accelerated video (audio is normal and duration
> is calculated well).
> If i transcode them to mpeg4 with a simple
> ffmpeg -i accelerated_video_clip.mpg ok_video.mp4
> pipeline plays well.
>
> ffmpe probe for the BAD video says:
> Duration: 00:00:42.26, start: 0.270000, bitrate: 6041 kb/s
> Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom
> first), 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
> Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s
>
> and media info says:
> General
> Complete name :
> /home/v1p3r/Video/temp/spot_i_miei_diritti_video_accelerato.mpg
> Format : MPEG-PS
> File size : 30.4 MiB
> Duration : 42 s 264 ms
> Overall bit rate mode : Variable
> Overall bit rate : 6 041 kb/s
>
> Video
> ID : 224 (0xE0)
> Format : MPEG Video
> Format version : Version 2
> Format profile : Main at Main
> Format settings : BVOP
> Format settings, BVOP : Yes
> Format settings, Matrix : Default
> Format settings, GOP : Variable
> Duration : 42 s 200 ms
> Bit rate mode : Variable
> Bit rate : 5 697 kb/s
> Maximum bit rate : 9 500 kb/s
> Width : 720 pixels
> Height : 576 pixels
> Display aspect ratio : 4:3
> Frame rate : 25.000 FPS
> Standard : PAL
> Color space : YUV
> Chroma subsampling : 4:2:0
> Bit depth : 8 bits
> Scan type : Progressive
> Scan order : Bottom Field First
> Compression mode : Lossy
> Bits/(Pixel*Frame) : 0.549
> Time code of first frame : 00:00:00:00
> Time code source : Group of pictures header
> GOP, Open/Closed : Closed
> Stream size : 28.7 MiB (94%)
>
> Audio
> ID : 192 (0xC0)
> Format : MPEG Audio
> Format version : Version 1
> Format profile : Layer 2
> Duration : 42 s 264 ms
> Bit rate mode : Constant
> Bit rate : 224 kb/s
> Channel(s) : 2 channels
> Sampling rate : 48.0 kHz
> Frame rate : 41.667 FPS (1152 SPF)
> Compression mode : Lossy
> Stream size : 1.13 MiB (4%)
>
> for a working mpeg 2
> ffprobe says:
> Duration: 00:00:35.76, start: 0.270000, bitrate: 5937 kb/s
> Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bottom
> first), 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
> Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s
>
> media info:
> General
> Complete name :
> /home/v1p3r/Video/temp/spot_linea_verde_febbraio_2014_ok.mpg
> Format : MPEG-PS
> File size : 25.3 MiB
> Duration : 35 s 784 ms
> Overall bit rate mode : Variable
> Overall bit rate : 5 934 kb/s
>
> Video
> ID : 224 (0xE0)
> Format : MPEG Video
> Format version : Version 2
> Format profile : Main at Main
> Format settings : BVOP
> Format settings, BVOP : Yes
> Format settings, Matrix : Default
> Format settings, GOP : M=3, N=12
> Duration : 35 s 720 ms
> Bit rate mode : Variable
> Bit rate : 5 592 kb/s
> Maximum bit rate : 9 500 kb/s
> Width : 720 pixels
> Height : 576 pixels
> Display aspect ratio : 4:3
> Frame rate : 25.000 FPS
> Standard : PAL
> Color space : YUV
> Chroma subsampling : 4:2:0
> Bit depth : 8 bits
> Scan type : Progressive
> Scan order : Bottom Field First
> Compression mode : Lossy
> Bits/(Pixel*Frame) : 0.539
> Time code of first frame : 00:00:00:00
> Time code source : Group of pictures header
> GOP, Open/Closed : Closed
> Stream size : 23.8 MiB (94%)
>
> Audio
> ID : 192 (0xC0)
> Format : MPEG Audio
> Format version : Version 1
> Format profile : Layer 2
> Duration : 35 s 784 ms
> Bit rate mode : Constant
> Bit rate : 224 kb/s
> Channel(s) : 2 channels
> Sampling rate : 48.0 kHz
> Frame rate : 41.667 FPS (1152 SPF)
> Compression mode : Lossy
> Stream size : 978 KiB (4%)
>
> This will appen also with autoaudiosink and autovideosink. Accelerated
> video.
> Seems the problem disappear if i remove the deinterlace/interlace filters
> (but now do not play on declink):
> gst-launch-1.0 uridecodebin uri=file:///path/to/acceleratedvideo.mpg
> name=decode decode. ! autovideoconvert ! videoconvert !
> video/x-raw,format=UYVY ! videoscale ! video/x-raw,width=720,height=576 !
> videorate ! autovideosink decode. ! audioconvert ! audioresample!
> autoaudiosink
>
>
> On Tue, 2 Apr 2019 at 19:05, Federico Allegretti <allegfede at gmail.com>
> wrote:
>
>> hello, searching the net, seeking a way to playback my digital video
>> files out of a black magic video card (i got an intensity pro), i found
>> this pipeline to work for most of my video files:
>> gst-launch-1.0 uridecodebin
>> uri=file:///mnt/nas/postion/of/th/file.extenision name=decode decode. !
>> interlace field-pattern=1 ! videoconvert ! video/x-raw,format=UYVY !
>> videoscale ! video/x-raw,width=720,height=576 ! videorate !
>> video/x-raw,framerate=25/1 ! decklinkvideosink mode=3 decode. !
>> audioconvert ! decklinkaudiosink
>>
>> PS: mode=3 stands for PAL SD 50i as i whant the card to play content out
>> of the composite cideo connector.
>>
>> This works quite well, but with some file playback do not occours.
>>
>> for example, with a file shot by cell phone i got no problem (those are
>> stats by ffmpeg):
>> h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 13976
>> kb/s, SAR 1:1 DAR 16:9, 15.03 fps, 15 tbr, 90k tbn, 180k tbc (default)
>> Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 156 kb/s
>> (default)
>>
>> but with another edited with pinnacle studio (stats by ffmpeg):
>> Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080
>> [SAR 1:1 DAR 16:9], 2024 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
>> Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
>> (default)
>>
>> i got this error:
>>
>> ERRORE: dall'elemento
>> /GstPipeline:pipeline0/GstURIDecodeBin:decode/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
>> Internal data stream error.
>> Informazioni di debug aggiuntive:
>> qtdemux.c(6073): gst_qtdemux_loop ():
>> /GstPipeline:pipeline0/GstURIDecodeBin:decode/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
>> streaming stopped, reason not-negotiated (-4)
>> ERRORE: la pipeline non vuole fare il preroll.
>> Impostazione della pipeline a NULL ...
>> Esecuzione di free sulla pipeline...
>>
>> I suppose that the problem could be the samplerate, so i resampled the
>> audio in this way:
>> ffmpeg -i grand_prix_casagrande.mp4 -vcodec copy -acodec aac -ar 48000
>> -ab 128000 -ac 2 grand_prix_casagrande_48.mp4
>>
>> and now the new file could be played back.
>>
>> My question now is: There is a way to make the resample AT RUNTIME (and
>> maybe only if needed)?
>>
>> Thanks a lot,
>>
>> Federico
>>
>> --
>> Sourceforge: https://sourceforge.net/u/allegfede/
>>
>> YouTube Channel: https://www.youtube.com/c/v1p3rslab
>>
>> VIMEO HD videos: http://www.vimeo.com/user1912745/videos
>>
>
>
> --
> Sourceforge: https://sourceforge.net/u/allegfede/
>
> YouTube Channel: https://www.youtube.com/c/v1p3rslab
>
> VIMEO HD videos: http://www.vimeo.com/user1912745/videos
>
--
Sourceforge: https://sourceforge.net/u/allegfede/
YouTube Channel: https://www.youtube.com/c/v1p3rslab
VIMEO HD videos: http://www.vimeo.com/user1912745/videos
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