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  • ffmpeg how to encode first then use it for another output

    10 août 2017, par mahdi gh

    I’m trying to capture screen with gdigrab and combine int with a sound and then send it on my decklink sdi device.

    here is my code to capture :

    ffmpeg -framerate 25 -thread_queue_size 512 -f gdigrab -i title="Play" -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -af aresample=resampler=soxr -ar 48000 -acodec pcm_s16le -ac 2 -c:v libx264 -qp 0 -preset ultrafast "output.avi"

    here is my code for output to ffmpeg :

    ffmpeg -i output.avi -f decklink -pix_fmt uyvy422 "DeckLink SDI (2)"

    this way it works, but when I combine these two arguments to send the output to decklink card on the fly, ffmpeg stops working. here is the combination code :

    ffmpeg -framerate 25 -thread_queue_size 512 -f gdigrab -i title="Play" -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -af aresample=resampler=soxr -ar 48000 -acodec pcm_s16le -ac 2  -f decklink -pix_fmt uyvy422 "DeckLink SDI (2)"

    I have tried so many different combinations but no luck. it works only if i store it on a file then use that file as input. Is there a way to tell ffmpeg to use the result of first command as input of second command ?

    Thanks

    Update :
    Here is log report :

        ffmpeg started on 2017-08-08 at 12:26:36
    
Report written to "ffmpeg-20170808-122636.log"
    
Command line:
    
ffmpeg -framerate 25 -thread_queue_size 512 -f gdigrab -i "title=Play" -c:v rawvideo -f dshow -i "audio=CABLE Output (VB-Audio Virtual Cable)" -af "aresample=resampler=soxr" -ar 48000 -acodec pcm_s16le -ac 2 -map 0:v:0 -map 1:a:0 -f decklink -pix_fmt uyvy422 "DeckLink SDI (2)" -report
    
ffmpeg version N-71608-ga924b83 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      54. 23.101 / 54. 23.101
    
  libavcodec     56. 35.101 / 56. 35.101
    
  libavformat    56. 30.100 / 56. 30.100
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 14.100 /  5. 14.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Splitting the commandline.
    
Reading option '-framerate' ... matched as AVOption 'framerate' with argument '25'.
    
Reading option '-thread_queue_size' ... matched as option 'thread_queue_size' (set the maximum number of queued packets from the demuxer) with argument '512'.
    
Reading option '-f' ... matched as option 'f' (force format) with argument 'gdigrab'.
    
Reading option '-i' ... matched as input file with argument 'title=Play'.
    
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'rawvideo'.
    
Reading option '-f' ... matched as option 'f' (force format) with argument 'dshow'.
    
Reading option '-i' ... matched as input file with argument 'audio=CABLE Output (VB-Audio Virtual Cable)'.
    
Reading option '-af' ... matched as option 'af' (set audio filters) with argument 'aresample=resampler=soxr'.
    
Reading option '-ar' ... matched as option 'ar' (set audio sampling rate (in Hz)) with argument '48000'.
    
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'pcm_s16le'.
    
Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '2'.
    
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:v:0'.
    
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '1:a:0'.
    
Reading option '-f' ... matched as option 'f' (force format) with argument 'decklink'.
    
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'uyvy422'.
    
Reading option 'DeckLink SDI (2)' ... matched as output file.
    
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
    
Finished splitting the commandline.
    
Parsing a group of options: global .
    
Applying option report (generate a report) with argument 1.
    
Successfully parsed a group of options.
    
Parsing a group of options: input file title=Play.
    
Applying option thread_queue_size (set the maximum number of queued packets from the demuxer) with argument 512.
    
Applying option f (force format) with argument gdigrab.
    
Successfully parsed a group of options.
    
Opening an input file: title=Play.
    
[gdigrab @ 0000000002d3f2a0] Found window Play, capturing 720x576x32 at (0,0)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (588,602) -> (-271,597)
    
[gdigrab @ 0000000002d3f2a0] All info found
    
Input #0, gdigrab, from 'title=Play':
    
  Duration: N/A, start: 1502178996.958615, bitrate: 331786 kb/s
    
    Stream #0:0, 1, 1/1000000: Video: bmp, bgra, 720x576, 331786 kb/s, 25 tbr, 1000k tbn, 25 tbc
    
Successfully opened the file.
    
Parsing a group of options: input file audio=CABLE Output (VB-Audio Virtual Cable).
    
Applying option c:v (codec name) with argument rawvideo.
    
Applying option f (force format) with argument dshow.
    
Successfully parsed a group of options.
    
Opening an input file: audio=CABLE Output (VB-Audio Virtual Cable).
    
[dshow @ 0000000002d3c340] Selecting pin Capture on audio only
    
dshow passing through packet of type audio size  88200 timestamp 111632750000 orig timestamp 111632750000
    
[dshow @ 0000000002d3c340] All info found
    
Guessed Channel Layout for  Input Stream #1.0 : stereo
    
Input #1, dshow, from 'audio=CABLE Output (VB-Audio Virtual Cable)':
    
  Duration: N/A, start: 11163.275000, bitrate: 1411 kb/s
    
    Stream #1:0, 1, 1/10000000: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
    
Successfully opened the file.
    
Parsing a group of options: output file DeckLink SDI (2).
    
Applying option af (set audio filters) with argument aresample=resampler=soxr.
    
Applying option ar (set audio sampling rate (in Hz)) with argument 48000.
    
Applying option acodec (force audio codec ('copy' to copy stream)) with argument pcm_s16le.
    
Applying option ac (set number of audio channels) with argument 2.
    
Applying option map (set input stream mapping) with argument 0:v:0.
    
Applying option map (set input stream mapping) with argument 1:a:0.
    
Applying option f (force format) with argument decklink.
    
Applying option pix_fmt (set pixel format) with argument uyvy422.
    
Successfully parsed a group of options.
    
Opening an output file: DeckLink SDI (2).
    
Successfully opened the file.
    
detected 2 logical cores
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] Setting 'video_size' to value '720x576'
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] Setting 'pix_fmt' to value '30'
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] Setting 'time_base' to value '1/1000000'
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] Setting 'pixel_aspect' to value '0/1'
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] Setting 'sws_param' to value 'flags=2'
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] Setting 'frame_rate' to value '25/1'
    
[graph 0 input from stream 0:0 @ 0000000002dd7ea0] w:720 h:576 pixfmt:bgra tb:1/1000000 fr:25/1 sar:0/1 sws_param:flags=2
    
[format @ 0000000002d3df00] compat: called with args=[uyvy422]
    
[format @ 0000000002d3df00] Setting 'pix_fmts' to value 'uyvy422'
    
[auto-inserted scaler 0 @ 0000000002d44ca0] Setting 'flags' to value '0x4'
    
[auto-inserted scaler 0 @ 0000000002d44ca0] w:iw h:ih flags:'0x4' interl:0
    
[format @ 0000000002d3df00] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
    
[AVFilterGraph @ 0000000002e586c0] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
    
[auto-inserted scaler 0 @ 0000000002d44ca0] w:720 h:576 fmt:bgra sar:0/1 -> w:720 h:576 fmt:uyvy422 sar:0/1 flags:0x4
    
[Parsed_aresample_0 @ 0000000002d513a0] Setting 'resampler' to value 'soxr'
    
[graph 1 input from stream 1:0 @ 0000000002d51460] Setting 'time_base' to value '1/44100'
    
[graph 1 input from stream 1:0 @ 0000000002d51460] Setting 'sample_rate' to value '44100'
    
[graph 1 input from stream 1:0 @ 0000000002d51460] Setting 'sample_fmt' to value 's16'
    
[graph 1 input from stream 1:0 @ 0000000002d51460] Setting 'channel_layout' to value '0x3'
    
[graph 1 input from stream 1:0 @ 0000000002d51460] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
    
[audio format for output stream 0:1 @ 0000000002d51520] Setting 'sample_fmts' to value 's16'
    
[audio format for output stream 0:1 @ 0000000002d51520] Setting 'sample_rates' to value '48000'
    
[audio format for output stream 0:1 @ 0000000002d51520] Setting 'channel_layouts' to value '0x3'
    
[AVFilterGraph @ 0000000002d4d0c0] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed
    
[Parsed_aresample_0 @ 0000000002d513a0] ch:2 chl:stereo fmt:s16 r:44100Hz -> ch:2 chl:stereo fmt:s16 r:48000Hz
    
dshow passing through packet of type audio size  88200 timestamp 111637810000 orig timestamp 111637810000
    
[decklink @ 0000000002dd6a00] Found Decklink mode 720 x 576 with rate 25.00(i)
    
Output #0, decklink, to 'DeckLink SDI (2)':
    
  Metadata:
    
    encoder         : Lavf56.30.100
    
    Stream #0:0, 0, 1/25: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x576, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    
    Metadata:
    
      encoder         : Lavc56.35.101 rawvideo
    
    Stream #0:1, 0, 1/48000: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    
    Metadata:
    
      encoder         : Lavc56.35.101 pcm_s16le
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (bmp (native) -> rawvideo (native))
    
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
    
Press [q] to stop, [?] for help
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
Cliping frame in rate conversion by 0.000008
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Encoder did not produce proper pts, making some up.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
*** 40 dup!
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 1.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 2.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 3.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 4.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 5.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 6.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 7.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 8.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 9.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 10.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 11.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 12.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 13.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
dshow passing through packet of type audio size  88200 timestamp 111642810000 orig timestamp 111642810000
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 14.
    
[decklink @ 0000000002dd6a00] Ending audio preroll.
    
[decklink @ 0000000002dd6a00] Starting scheduled playback.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 15.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 16.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 17.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 18.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 19.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 20.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 21.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 22.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 23.
    
[decklink @ 0000000002dd6a00] Buffered video frames: 24.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[decklink @ 0000000002dd6a00] Buffered video frames: 24.
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
frame=   42 fps=0.0 q=0.0 size=N/A time=00:00:01.68 bitrate=N/A dup=40 drop=0    
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
dshow passing through packet of type audio size  88200 timestamp 111647710000 orig timestamp 111647710000
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (689,472) -> (-170,467)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (814,496) -> (-45,491)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (814,496) -> (-45,491)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (811,497) -> (-48,492)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (811,497) -> (-48,492)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (811,497) -> (-48,492)
    
[gdigrab @ 0000000002d3f2a0] Cursor pos (806,497) -> (-53,492)

  • Using ffmpeg to stream to or from Balckmagic cards

    8 mars 2016, par Dave_A

    I want to use blackmagic cards with ffmpeg to stream their input but there is a problem.

    When I use "H264 Pro" Encoder as a "decklink" or "dshow" input, I see this error in command line output of ffmpeg. Device is ok and I can Use it with other applications like MXPTiny or MXLight.

    Here is the command and output :

    ffmpeg -f dshow -list_devices true -i dummy -hide_banner
    
[dshow @ 0000000004efa5a0] DirectShow video devices (some may be both video and audio devices)
    
[dshow @ 0000000004efa5a0]  "Integrated Webcam"
    
[dshow @ 0000000004efa5a0]     Alternative name "@device_pnp_\\?\usb#vid_0c45&pid_641d&mi_00#7&11c87d18&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
    
[dshow @ 0000000004efa5a0]  "Decklink Video Capture"
    
[dshow @ 0000000004efa5a0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{44A8B5C7-13B6-4211-BD40-35B629D9E6DF}"
    
[dshow @ 0000000004efa5a0] DirectShow audio devices
    
[dshow @ 0000000004efa5a0]  "Microphone (2- High Definition Audio Device)"
    
[dshow @ 0000000004efa5a0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{11A03288-DE6D-4A21-A66E-DC9303E838FA}"
    
[dshow @ 0000000004efa5a0]  "Decklink Audio Capture"
    
[dshow @ 0000000004efa5a0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{AAA22F7E-5AA0-49D9-8C8D-B52B1AA92EB7}"
    
dummy: Immediate exit requested

    and when I use "Decklink Audio Capture" to identify its options, here is the output :

    ffmpeg -f dshow -list_options true -i video="Decklink Video Capture" -hide_banner
    
[dshow @ 000000000388a660] Unable to BindToObject for Decklink Video Capture
    
[dshow @ 000000000388a660] Could not find video device with name [Decklink Video Capture] among source devices of type video.
    
video=Decklink Video Capture: Input/output error

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