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• How to convert rtmp hevc video stream to srt av1 endpoint with ffmpeg ?

  20 juin 2024, par Lulík

  i want use ffmpeg to listen rtmp stream and send to srt endpoint.

  


  Flow : smartphone (camera) -> laptop (ffmpeg script) -> desktop (obs studio)

  


  ffmpeg script show warning message and in obs stuido i can see any video only audio.

  


  Thank you in advance.

  


  Console output while running script (error in the end is bcs i stoped sending data from phone) :

  


  ffmpeg version git-2024-06-20-8d6014d Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --enable-libsvtav1 --enable-libsrt
  libavutil      59. 24.100 / 59. 24.100
  libavcodec     61.  8.100 / 61.  8.100
  libavformat    61.  3.104 / 61.  3.104
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
Input #0, flv, from 'rtmp://192.168.0.194/s/streamKey':
  Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv, smpte170m/bt470bg/smpte170m), 1080x1920, 10240 kb/s, 30 fps, 120 tbr, 1k tbn
  Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 131 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> av1 (libsvtav1))
  Stream #0:1 -> #0:1 (aac (native) -> mp2 (native))
Press [q] to stop, [?] for help
Svt[info]: -------------------------------------------
Svt[info]: SVT [version]:   SVT-AV1 Encoder Lib 595a874
Svt[info]: SVT [build]  :   GCC 12.2.0   64 bit
Svt[info]: LIB Build date: Jun 20 2024 14:25:08
Svt[info]: -------------------------------------------
Svt[info]: Number of logical cores available: 12
Svt[info]: Number of PPCS 76
Svt[info]: [asm level on system : up to avx2]
Svt[info]: [asm level selected : up to avx2]
Svt[info]: -------------------------------------------
Svt[info]: SVT [config]: main profile   tier (auto) level (auto)
Svt[info]: SVT [config]: width / height / fps numerator / fps denominator       : 1080 / 1920 / 120 / 1
Svt[info]: SVT [config]: bit-depth / color format                   : 8 / YUV420
Svt[info]: SVT [config]: preset / tune / pred struct                    : 10 / PSNR / random access
Svt[info]: SVT [config]: gop size / mini-gop size / key-frame type          : 641 / 16 / key frame
Svt[info]: SVT [config]: BRC mode / rate factor                     : CRF / 35 
Svt[info]: SVT [config]: AQ mode / variance boost                   : 2 / 0
Svt[info]: -------------------------------------------
Svt[warn]: Failed to set thread priority: Invalid argument
Output #0, mpegts, to 'srt://192.168.0.167:9998?mode=caller':
  Metadata:
    encoder         : Lavf61.3.104
  Stream #0:0: Video: av1, yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1080x1920, q=2-31, 120 fps, 90k tbn
      Metadata:
        encoder         : Lavc61.8.100 libsvtav1
  Stream #0:1: Audio: mp2, 44100 Hz, stereo, s16, 384 kb/s
      Metadata:
        encoder         : Lavc61.8.100 mp2
[mpegts @ 0x55ec921d9540] Stream 0, codec av1, is muxed as a private data stream and may not be recognized upon reading.
[in#0/flv @ 0x55ec9219cc40] Error during demuxing: Input/output error1990.7kbits/s speed=0.967x    
[out#0/mpegts @ 0x55ec922247c0] video:4431KiB audio:1138KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 6.374870%
frame=  723 fps= 31 q=35.0 Lsize=    5923KiB time=00:00:24.12 bitrate=2011.3kbits/s speed=1.04x


  


  I send video stream from mobile app over rtmp encoded with hevc to my laptop where running script ffmpeg -f flv -listen 1 -i rtmp://192.168.0.194/s/streamKey -c:v libsvtav1 -f mpegts srt://192.168.0.167:9998?mode=caller. On the desktop i have obs with media source input srt://192.168.0.167:9998?mode=listener.

  


  When i run ffmpeg script without video codec option (-c:v libsvtav1) its working fine and in obs i can see video from my phone camera. With the option i can not see video only audio.
I clearly dont understand warning message : [mpegts @ 0x55ec921d9540] Stream 0, codec av1, is muxed as a private data stream and may not be recognized upon reading..
Do I need specify codec (av1) in obs media source or my ffmpeg script is wrong ?

  


• ffmpeg transcoding : Metallic distorsion on macOS

  10 septembre 2024, par Xavi

  I am following ffmpeg's transcoding.c example to record audio and video from my input devices into an mp4 output file with H264 and AAC as codecs. I have no issues with the video and the audio transcoding works correctly on Windows.

  


  However, on macOS I have an issue with any input device other than the internal microphone of my laptop : the audio comes out distorted and sounding noisy and metallic (sample recording claps : https://file.io/nEn8MXHUAUQ2). I went through the input and output parameters for the filter several times, checked the values, but there must be something I'm missing. And I can't explain why it works on Windows with the same devices.

  


  Has anyone run into a similar problem before ? Any idea where I should start looking at ?

  


  Additional comments :

  


  

  1. While the Macbook's internal microphone (the only one that works) has only one channel, the other microphones I have available are stereo, so I can't say for sure that that's where the problem is.

  


  2. I also tested it on a macbook mini, with the same results.

  


  3. ffmpeg 6.1.1, MacOs 14.5

  


  4. Input filter arguments : time_base=1/1000000:sample_rate=48000:sample_fmt=1:channel_layout=stereo

  


  5. Output filter arguments : setpts=PTS-STARTPTS,aresample=48000:async=1:out_sample_fmt=8:out_chlayout=stereo,asetnsamples=n=1024

  


  


• HEVC with alpha [closed]

  3 mai 2024, par foxhable

  I trying create HEVC with alpha video from png images through ffmpeg.

  


  When i try, it outputs a video that works, has a transparent background and opens in QuickTime, but does not open in Safari. Then i try creating in prores 4444 codec and convert from macOS Context Menu -> Encode Selected Video Files with HEVC 1080p and Preserve Transparency. It has work - video with transparent background, open in QuickTime and in Safari.

  


  So i tried understand what a difference in meta data and only what i find its working video has HVEC encoder, but not working has Lavc61.5.103 hevc_videotoolbox. Can i somehow programmatically or from utilities like ffmpeg create video with HEVC With alpha, which working like from macOS context menu ? macOS context menu doesnt fit because i cant compress or create many videos

  


  Detail info

  


  I have example of working video. Info from ffprobe

  


  ffprobe movie-hevc.mov
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\movie-hevc.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2021-01-02T10:33:38.000000Z
  Duration: 00:00:09.02, start: 0.000000, bitrate: 4053 kb/s
  Stream #0:0[0x1](und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, progressive), 1280x720 [SAR 1:1 DAR 16:9], 4046 kb/s, 60 fps, 60 tbr, 600 tbn (default)
      Metadata:
        creation_time   : 2021-01-02T10:33:38.000000Z
        handler_name    : Core Media Video
        vendor_id       : [0][0][0][0]
        encoder         : HEVC


  


  Info about video which i create in prores by ffmpeg command, then convert through macOS context menu

  


  command :

  


  ffmpeg -i a%d.png -r 30 -c:v prores_ks -profile:v 4  -allow_sw 1 -alpha_quality 1 -vtag hvc1 prores.mov


  


  info after converting

  


  ffprobe .\native-hevc.mov
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\native-hevc.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2024-05-03T07:04:26.000000Z
  Duration: 00:00:12.77, start: 0.000000, bitrate: 8796 kb/s
  Stream #0:0[0x1](und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1920, 8792 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
      Metadata:
        creation_time   : 2024-05-03T07:04:27.000000Z
        handler_name    : Core Media Video
        vendor_id       : [0][0][0][0]
        encoder         : HEVC


  


  Info about video which i`m create direct in hevc by ffmpeg command

  


  ffmpeg -i a%d.png -r 30 -c:v hevc_videotoolbox -allow_sw 1 -alpha_quality 1 -vtag hvc1 ffmpeg-hevc.mov


  


  Info :

  


  ffprobe .\ffmpeg-hevc.mov
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\ffmpeg-hevc.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf61.3.103
  Duration: 00:00:12.77, start: 0.000000, bitrate: 3437 kb/s
  Stream #0:0[0x1]: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bottom coded first (swapped)), 1920x1920, 3435 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : FFMP
        encoder         : Lavc61.5.103 hevc_videotoolbox


  


  also i tried :

  


  

  • props -allow_sw 0 - get error

  


  • -alpha-quality 0.75, -pix_fmt bgra - safari not open, QT yes, transparent bg

  


  • without -vtag hvc1 - QuickTime cannot open

  


  • Tried convert from webm to hevc_videotoolbox - safari not open, QT yes, transparent bg

  


  • tried convert webm into pngs and in hevc_videotoolbox - safari not open, QT yes, transparent bg

  


  


  Tried answers :

  


  

  • https://stackoverflow.com/a/61663438

  


  • https://stackoverflow.com/a/69262399/17330336

  


  


  mac info :

  


  

  • macOS Monterey 12.7.2

  


  • Mac mini (Late 2012)

  


  • Core i5 3210M

  


  • Graphics Intel HD 4000