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• ffmpeg streaming from local drive to RTSP gives black video in some streaming services :(

  27 avril 2022, par John R

  This question if about ffmpeg flags or options.....

  


  example, this ffmpeg command work perfectly well in mux.com but NOT in livepeer.com

  


      ffmpeg -re -i 1.webm -threads 4 
-c:v libx264 -movflags +dash -preset fast 
-tune zerolatency -pix_fmt yuv420p -c:a aac 
-b:a 192k -ac 2 -profile:v high -b:v 1369k 
-r 30 -g 60 -bufsize 969k 
-f flv "rtmp://rtmp.livepeer.com/live/streamkey"


  


  

  


  QUESTION : I'm I missing something ???

  


  I try -f mpegts => I get black video in the stream dasboard

  


  I'm stuck...

  


• How do I use ffmpeg to concatenate 2 videos and add a period of silence + black screen between them ?

  29 avril 2022, par masotime

  There are several existing examples, but I'd like a single command that uses complex_filter to achieve the objective without doing extra things like generating blank video / audio files.

  


  Looking around, this is the best I've come up with so far :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "color=black:s=960x540:d=1[b0];aevalsrc=0:d=1[s0];[0:v:0][0:a:0][b0][s0][1:v:0][1:a:0]concat=n=3:v=1:a=1[outv][outa]" -map '[outv]' -map '[outa]' out.mp4


  


  My understanding of the breakdown of such a command is

  


  

  1. specify 2 inputs

  


  2. define a complex filter

  


  3. define a black video stream of duration 1s and call it b0

  


  4. define a silent audio stream of duration 1s and call it s0

  


  5. pipe it through the concat filter with

  


  


  

  • First stream : [0:v:0][0:a:0] // video1.mp4

  


  • Second stream : [b0][s0] // stuff I defined earlier

  


  • Third stream : [1:v:0][1:a:0] // video2.mp4

  


  


  

  6. define 2 output streams [outv][outa] for video and audio respectively

  


  7. combine them into out.mp4

  


  


  All file inputs are correctly 960x540, all using the same audio and video codecs but ffmpeg gives me this error and starts using 100% CPU

  


  More than 1000 frames duplicated


  


  I think there's something wrong with the streams I'm defining in the filter - what's wrong ? Do I need to specify more parameters somewhere ?

  


  EDIT : Here's a MediaInfo printout of the input video's metadata

  


  Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/mp41)
File size                                : 7.82 MiB
Duration                                 : 31 s 449 ms
Overall bit rate                         : 2 086 kb/s
Writing application                      : Lavf59.16.100

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L3@Main
Codec ID                                 : hvc1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 31 s 449 ms
Bit rate                                 : 1 973 kb/s
Maximum bit rate                         : 2 000 kb/s
Width                                    : 960 pixels
Height                                   : 540 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 0)
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.159
Stream size                              : 7.40 MiB (95%)
Writing library                          : x265 3.4+31-6722fce1f:[Mac OS X][clang 12.0.0][64 bit] 8bit+10bit+12bit
Encoding settings                        : cpuid=1111039 / frame-threads=4 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=960x540 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=3 / no-allow-non-conformance / no-repeat-headers / annexb / no-aud / no-hrd / info / hash=0 / no-temporal-layers / open-gop / min-keyint=23 / keyint=250 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=20 / lookahead-slices=0 / scenecut=40 / hist-scenecut=0 / radl=0 / no-splice / no-intra-refresh / ctu=64 / min-cu-size=8 / no-rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=0 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=3 / limit-refs=1 / no-limit-modes / me=1 / subme=2 / merange=57 / temporal-mvp / no-frame-dup / no-hme / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=3 / selective-sao=4 / early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=0.00 / no-rd-refine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=abr / bitrate=2000 / qcomp=0.60 / qpstep=4 / stats-write=1 / stats-read=0 / slow-firstpass / ipratio=1.40 / pbratio=1.30 / aq-mode=2 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=1 / overscan=0 / videoformat=5 / range=0 / colorprim=1 / transfer=1 / colormatrix=1 / chromaloc=1 / chromaloc-top=0 / chromaloc-bottom=0 / display-window=0 / cll=0,0 / min-luma=0 / max-luma=255 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / hist-threshold=0.03 / no-opt-cu-delta-qp / no-aq-motion / no-hdr10 / no-hdr10-opt / no-dhdr10-opt / no-idr-recovery-sei / analysis-reuse-level=0 / analysis-save-reuse-level=0 / analysis-load-reuse-level=0 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=1 / refine-ctu-distortion=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-analysis-type=0 / copy-pic=1 / max-ausize-factor=1.0 / no-dynamic-refine / no-single-sei / no-hevc-aq / no-svt / no-field / qp-adaptation-range=1.00 / scenecut-aware-qp=0conformance-window-offsets / right=0 / bottom=0 / decoder-max-rate=0 / no-vbv-live-multi-pass
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 31 s 449 ms
Source duration                          : 31 s 492 ms
Source_Duration_LastFrame                : -17 ms
Bit rate mode                            : Constant
Bit rate                                 : 106 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 405 KiB (5%)
Source stream size                       : 406 KiB (5%)
Title                                    : Core Media Audio
Language                                 : English
Default                                  : Yes
Alternate group                          : 1


  


• FFmpeg extracts black image from H264 stream

  8 juin 2022, par massivemoisture

  I have a C# application that receives H264 stream through a socket. I want to continuously get the latest image from that stream.

  


  Here's what I did with FFmpeg 5.0.1, just a rough sample to get ONE latest image, how I start FFmpeg :

  


  var ffmpegInfo = new ProcessStartInfo(FFMPEG_PATH);
ffmpegInfo.RedirectStandardInput = true;
ffmpegInfo.RedirectStandardOutput = true;
ffmpegInfo.RedirectStandardError = true;
ffmpegInfo.UseShellExecute = false;

ffmpegInfo.Arguments = "-i pipe: -f h264 -pix_fmt bgr24 -an -sn pipe:";

ffmpegInfo.UseShellExecute = false;
ffmpegInfo.CreateNoWindow = true;

Process myFFmpeg = new Process();
myFFmpeg.StartInfo = ffmpegInfo;
myFFmpeg.EnableRaisingEvents = true;
myFFmpeg.Start();

var inStream = myFFmpeg.StandardInput.BaseStream;
FileStream baseStream = myFFmpeg.StandardOutput.BaseStream as FileStream;
myFFmpeg.BeginErrorReadLine();


  


  Then I start a new thread to receive the stream through socket :

  


  // inStream is "myFFmpeg.StandardInput.BaseStream" from the code block above
var t = Task.Run(() => ReceiveStream(inStream));


  


  Next I read the output from FFmpeg :

  


  byte[] decoded = new byte[Width * Height * 3];
int numBytesToRead = Width * Height * 3;
int numBytesRead = 0;

while (numBytesToRead > 0)
{
   int n = baseStream.Read(decoded, 0, decoded.Length);
   Console.WriteLine($"Read {n} bytes");
   if (n == 0)
   {
      break;
   }              
      numBytesRead += n;
      numBytesToRead -= n;
}


  


  Lastly, I use ImageSharp library to save decoded byte array as a jpeg file.

  


  image.Save("test.jpeg", encoder);


  


  However, test.jpeg always comes out as a black image. What did I do wrong ?
Here's the stderr log that I got from ffmpeg :

  


  
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (High), yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1080x2256, 25 fps, 25 tbr, 1200k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Incompatible pixel format 'bgr24' for codec 'libx264', auto-selecting format 'yuv444p'
[libx264 @ 0x11b9068f0] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x11b9068f0] profile High 4:4:4 Predictive, level 5.0, 4:4:4, 8-bit
Output #0, h264, to 'pipe:':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0: Video: h264, yuv444p(tv, smpte170m/bt470bg/smpte170m, progressive), 1080x2256, q=2-31, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc59.18.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   56 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
frame=   87 fps= 83 q=28.0 size=     370kB time=00:00:01.16 bitrate=2610.6kbits/s speed=1.11x
frame=  118 fps= 75 q=28.0 size=     698kB time=00:00:02.40 bitrate=2381.4kbits/s speed=1.54x
frame=  154 fps= 75 q=28.0 size=    1083kB time=00:00:03.84 bitrate=2311.1kbits/s speed=1.86x
...


  


  Thank you !

  


  Edit : as suggested by @kesh, I have changed h264 to rawvideo, the arguments now are : -i pipe: -f rawvideo -pix_fmt bgr24 -an -sn pipe:

  


  Here's the output of ffmpeg :

  


  Input #0, h264, from 'pipe:':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (High), yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1080x2256, 25 fps, 25 tbr, 1200k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
// About 9 of these "No accelerated colorspace..." message
[swscaler @ 0x128690000] [swscaler @ 0x1286a0000] No accelerated colorspace conversion found from yuv420p to bgr24.
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0: Video: rawvideo (BGR[24] / 0x18524742), bgr24(pc, gbr/bt470bg/smpte170m, progressive), 1080x2256, q=2-31, 1461888 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc59.18.100 rawvideo
frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
// FFmpeg outputs no more log after this