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• ffmpeg produces "is_avc" = false with h264_nvenc & tee muxer

  14 août 2018, par Areeb111

  I am using ffmpeg for encoding MKV (Matroska Video files) to 2x MP4 (H264 - 720p Main@L4) & (H264 - 360p Baseline@L3.1).

  Having really strange problem when using -c:v h264_nvenc and tee muxer then the produced output file is having is_avc=false even i have checked the same input matroska file with another server running with Intel QuickSync -c:v h264_qsv with the same command then the produced output file is is_avc=true.

  The main goal that i want the is_avc=true is because the files must be played using nginx-vod-module which requires the AVC video format to be streamed.

  Steps to reproduce the problem :

  • Custom ffmpeg build with NVENC support ffmpeg version N-91182-gbdf1bbd Copyright (c) 2000-2018 the FFmpeg developers   built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-28)
  • ffprobe version 4.0.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2018 the FFmpeg developers
  • Running ffmpeg command line with NVENC and tee muxer

    /root/ffmpeg  -y -t 00:00:50 -i "testinput.mkv" -filter_complex "[0:v]split=2[s0][s1];[s0]scale=-2:720[v0];[s1]scale=-2:360[v1]" -map "[v0]" -map "[v1]" -map 0:a -c:v h264_nvenc -b:v:0 1100k -b:v:1 600k -profile:v:0 main -profile:v:1 baseline -level:v:0 4 -level:v:1 3.1 -ac 2 -c:a aac -b:a 128k -af "aresample=async=1000:first_pts=0"  -f tee "[select=\'v:0,a\']testoutput.mp4|[select=\'v:1,a\']testoutput-360.mp4"

  • Running ffprobe for the output file to check "is_avc" :

    ./ffprobe -v quiet -print_format json -show_format -show_streams testoutput.mp4

  • My current ffprobe output results are :

    ./ffprobe -v quiet -print_format json -show_format -show_streams testoutput.mp4
    
     {
    
        "streams": [
    
            {
    
                "index": 0,
    
                "codec_name": "h264",
    
                "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    
                "profile": "Main",
    
                "codec_type": "video",
    
                "codec_time_base": "1001/48000",
    
                "codec_tag_string": "avc1",
    
                "codec_tag": "0x31637661",
    
                "width": 1280,
    
                "height": 720,
    
                "coded_width": 1280,
    
                "coded_height": 720,
    
                "has_b_frames": 0,
    
                "sample_aspect_ratio": "1:1",
    
                "display_aspect_ratio": "16:9",
    
                "pix_fmt": "yuv420p",
    
                "level": 40,
    
                "chroma_location": "left",
    
                "refs": 1,
    
                "is_avc": "false",
    
                "nal_length_size": "0",
    
                "r_frame_rate": "24000/1001",
    
                "avg_frame_rate": "24000/1001",
    
                "time_base": "1/24000",
    
                "start_pts": 984,
    
                "start_time": "0.041000",
    
                "duration_ts": 1201200,
    
                "duration": "50.050000",
    
                "bit_rate": "845035",
    
                "bits_per_raw_sample": "8",
    
                "nb_frames": "1199",
    
                "disposition": {
    
                    "default": 1,
    
                    "dub": 0,
    
                    "original": 0,
    
                    "comment": 0,
    
                    "lyrics": 0,
    
                    "karaoke": 0,
    
                    "forced": 0,
    
                    "hearing_impaired": 0,
    
                    "visual_impaired": 0,
    
                    "clean_effects": 0,
    
                    "attached_pic": 0,
    
                    "timed_thumbnails": 0
    
                },
    
                "tags": {
    
                    "language": "und",
    
                    "handler_name": "VideoHandler"
    
                }
    
            },
    
            {
    
                "index": 1,
    
                "codec_name": "aac",
    
                "codec_long_name": "AAC (Advanced Audio Coding)",
    
                "profile": "LC",
    
                "codec_type": "audio",
    
                "codec_time_base": "1/48000",
    
                "codec_tag_string": "mp4a",
    
                "codec_tag": "0x6134706d",
    
                "sample_fmt": "fltp",
    
                "sample_rate": "48000",
    
                "channels": 2,
    
                "channel_layout": "stereo",
    
                "bits_per_sample": 0,
    
                "r_frame_rate": "0/0",
    
                "avg_frame_rate": "0/0",
    
                "time_base": "1/48000",
    
                "start_pts": 0,
    
                "start_time": "0.000000",
    
                "duration_ts": 2401488,
    
                "duration": "50.031000",
    
                "bit_rate": "129153",
    
                "max_bit_rate": "129153",
    
                "nb_frames": "2346",
    
                "disposition": {
    
                    "default": 1,
    
                    "dub": 0,
    
                    "original": 0,
    
                    "comment": 0,
    
                    "lyrics": 0,
    
                    "karaoke": 0,
    
                    "forced": 0,
    
                    "hearing_impaired": 0,
    
                    "visual_impaired": 0,
    
                    "clean_effects": 0,
    
                    "attached_pic": 0,
    
                    "timed_thumbnails": 0
    
                },
    
                "tags": {
    
                    "language": "ger",
    
                    "handler_name": "SoundHandler"
    
                }
    
            }
    
        ],
    
        "format": {
    
            "filename": "Leonmusssterben20171080p.mp4",
    
            "nb_streams": 2,
    
            "nb_programs": 0,
    
            "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
    
            "format_long_name": "QuickTime / MOV",
    
            "start_time": "0.000000",
    
            "duration": "50.031000",
    
            "size": "6116472",
    
            "bit_rate": "978029",
    
            "probe_score": 100,
    
            "tags": {
    
                "major_brand": "isom",
    
                "minor_version": "512",
    
                "compatible_brands": "isomiso2avc1mp41",
    
                "encoder": "Lavf58.17.100"
    
            }
    
        }
    
    }

  Please anyone can help me why is the output video file is getting "is_avc=false" ?

  Is there any option to force it ?

  Thank you

• avformat/ivfenc : Set the "number of frames" in IVF header

  3 juillet 2023, par Dai, Jianhui J

  avformat/ivfenc : Set the "number of frames" in IVF header
  Should set "number of frames" to bytes 24-27 of IVF header, not
  
  duration.
  
  It is described by [1], and confirmed by parsing all IVF files in [2].
  This commit also updates the md5sum of refs to pass fate-cbs.
  [1] Duck IVF - MultimediaWiki
  
  https://wiki.multimedia.cx/index.php/Duck_IVF
  [2] webm/vp8-test-vectors
  
  https://chromium.googlesource.com/webm/vp8-test-vectors
  Signed-off-by : Jianhui Dai <jianhui.j.dai@intel.com>
  
  Signed-off-by : Ronald S. Bultje <rsbultje@gmail.com>
  

  • [DH] libavformat/ivfdec.c
  • [DH] libavformat/ivfenc.c
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-03-deltaq
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-06-bilinear
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-09-lf_deltas
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-10-show-existing-frame
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-10-show-existing-frame2
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-segmentation-aq-akiyo
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-segmentation-sf-akiyo
  • [DH] tests/ref/fate/cbs-vp9-vp90-2-tiling-pedestrian
  • [DH] tests/ref/fate/cbs-vp9-vp91-2-04-yuv440
  • [DH] tests/ref/fate/cbs-vp9-vp91-2-04-yuv444
  • [DH] tests/ref/fate/cbs-vp9-vp92-2-20-10bit-yuv420
  • [DH] tests/ref/fate/cbs-vp9-vp93-2-20-10bit-yuv422
  • [DH] tests/ref/fate/cbs-vp9-vp93-2-20-12bit-yuv444

• FFmpeg stream giving me "Alsa" errors

  14 mars 2019, par Sherman B.

  Of late I have been trying different ways of telling my Raspberry Pi to send video to YouTube live stream. One of the things I wanted to be able to do is boot the Pi up, and it automatically starts the live stream on its own. The advantages to this are huge (won’t have to tote around keyboard/mouse to start the stream, or have to ssh into the Pi to start the stream).

  Now what I did to accomplish this was to make a Python program that pipes the stream from my encoder(FFmpeg) directly to the stream. My goal was to make the program work, and then, set it to run automatically. But every time I run the file in my terminal this is my result :

  Traceback (most recent call last):
  
    File "stream.py", line 22, in <module>
  
      stream.stdin.close() 
  
  NameError: name 'stream' is not defined
  
  [h264 @ 0x19ed450] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  pi@raspberrypi:~ $ Input #0, h264, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264, none, 25 tbr, 1200k tbn, 50 tbc
  
  Unknown input format: 'alsa'
  
  </module>

  Now I think I can fix I can fix some of those errors, but the biggest thing that worries me there is : the fact that "alsa" is unknown. I installed "libsasound" which is supposed to make Alsa usable, but that clearly did not help.

  I am using Python 3.

  This is my syntax for this program :

  import subprocess 
  
  import picamera 
  
  import time 
  
  YOUTUBE="rtmp://a.rtmp.youtube.com/live2/" 
  
  KEY = ("MY PERSONAL ENCODER KEY") 
  
  stream_cmd = 'ffmpeg -f h264 -r 25 -i - -itsoffset 5.5 -fflags nobuffer -f alsa -ac 1 -i hw:1,0 -vcodec copy -acodec aac -ac 1 -ar 8000 -ab 32k -map 0:0 -map 1:0 -strict experimental -f flv ' + YOUTUBE + KEY 
  
  stream_pipe = subprocess.Popen(stream_cmd, shell=True, stdin=subprocess.PIPE) 
  
  camera = picamera.PiCamera(resolution=(640, 480), framerate=25) 
  
  try: 
  
    now = time.strftime("%Y-%m-%d-%H:%M:%S") 
  
    camera.framerate = 25 
  
    camera.vflip = True 
  
    camera.hflip = True 
  
    camera.start_recording(stream.stdin, format='h264', bitrate = 2000000) 
  
    while True: 
  
       camera.wait_recording(1) 
  
  except KeyboardInterrupt: 
  
       camera.stop_recording() 
  
  finally: 
  
    camera.close()
  
    stream.stdin.close() 
  
    stream.wait() 
  
    print("Camera safely shut down") 
  
    print("Good bye") 

  Now maybe I am missing something simple here, but I don’t know what. I have tried many ideas (e.g. replacing Alsa with some other input, naming the "stream" function.) I have no idea.