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Louis Letourneau
Has anyone managed to capture a feed using the "USB Capture SDI 4k"
from Magewell with ffmpeg?

It runs for awhile but then a 0 byte packet comes along and ffmped just stops.
It doesn't quit, but the frame number just stops and it doesn't do
anything after rhis.

I saw 2 bugs from 2014 and both seem to state it's fixed but clearly it's not.

Thank you. Output following.


> ffmpeg -y -r 60 -thread_queue_size 256 -f v4l2 -framerate 60 -i /dev/video1 -thread_queue_size 256 -f alsa -i hw:1 -codec:a libfdk_aac -b:a 128k -codec:v libx264 -crf 18 -preset ultrafast -pix_fmt yuv422p -t 00:53:00 title.mp4

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  configuration: --prefix=/data/software/ffmpeg-3.4.2 --enable-gpl
--enable-libfreetype --enable-libx264 --enable-libx265
--enable-nonfree --enable-libfdk-aac --enable-libopus --enable-libvpx
--enable-openssl --enable-shared --enable-sdl2
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[video4linux2,v4l2 @ 0x1039680] Dequeued v4l2 buffer contains 362568
bytes, but 460800 were expected. Flags: 0x00012001.
Input #0, video4linux2,v4l2, from '/dev/video1':
  Duration: N/A, bitrate: 221184 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422,
640x360, 221184 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:1':
  Duration: N/A, start: 1552090307.006454, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x104ff80] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x104ff80] profile High 4:2:2, level 3.1, 4:2:2 8-bit
[libx264 @ 0x104ff80] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html -
options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1
psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0
8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0
threads=11 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0
keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0
crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to 'title.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
yuv422p(progressive), 640x360, q=-1--1, 60 fps, 15360 tbn, 60 tbc
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (libfdk_aac) (mp4a / 0x6134706D), 48000
Hz, stereo, s16, 128 kb/s
    Metadata:
      encoder         : Lavc57.107.100 libfdk_aac
[video4linux2,v4l2 @ 0x1039680] Dequeued v4l2 buffer contains
corrupted data (0 bytes).=   1x
    Last message repeated 63 times
frame=46086 fps= 43 q=20.0 size=  613888kB time=00:12:47.91
bitrate=6548.9kbits/s speed=0.721x
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Re: "USB Capture SDI 4k"

Carl Zwanzig
(fixed the subject line)

On 3/8/2019 4:53 PM, Louis Letourneau wrote:
> ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers

Please try with a current build, that's way too old.

z!
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