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• h.264 Hardware Encoding with ffmpeg

  23 mai 2016, par Paolo

  I must capture h.264 raw stream in Linux from a UVC USB camera with Sonix SN9C291B h.264 hardware encoder, maybe the most used camera controller encoder.
  Now, I only found sample code to capture stream using avformat_open_input with /dev/video0 or /dev/video1 function but it does not work.
  What is the ffmpeg function I must use to capture h.264 raw data from the camera ?

  After call the function :

   c = avcodec_alloc_context3 (codec);
  
  
  
   c->bit_rate = 400000;
  
  
  
   c->width = 640; this setting generate an error! Why?

• ffmpeg dont change time duration

  26 mars 2017, par combo_ci

  I tried to convert a UDP stream (that genrated from DVB signal) to HLS m3u8 file with this code :

  ffmpeg -i udp://239.1.2.1:60001 -acodec aac -strict -2 -vcodec libx264 -hls_wrap 100 -f hls /var/www/html/ts/1.m3u8 

  and output m3u8 file is :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:3
  
  #EXT-X-MEDIA-SEQUENCE:66
  
  #EXTINF:0.960000,
  
  21.ts
  
  #EXTINF:2.080000,
  
  22.ts
  
  #EXTINF:2.400000,
  
  23.ts
  
  #EXTINF:1.760000,
  
  24.ts
  
  #EXTINF:2.080000,
  
  20.ts

  I tried to change the target duration to 10 in this file with the option -segment_time 10 but the target duration doesn’t change in m3u8 file, can anybody help me with this problem ?

• Issue when combining 2 video files [after matching the specs]

  6 décembre 2015, par Rune

  Basically I got a .mp4 and a .flv file which I want to concatenate (the .mp4 should be the intro).

  So after having asked a previous question regarding this I went ahead and converted the intro video to an .flv with matching specifications of the second video.

  First I got the specifications of the second (.flv) video using ffprobe. This was the output :

  {
  
      "streams": [
  
          {
  
              "index": 0,
  
              "codec_name": "h264",
  
              "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
              "profile": "High",
  
              "codec_type": "video",
  
              "codec_time_base": "1/50",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "width": 646,
  
              "height": 364,
  
              "coded_width": 656,
  
              "coded_height": 368,
  
              "has_b_frames": 2,
  
              "sample_aspect_ratio": "1:1",
  
              "display_aspect_ratio": "323:182",
  
              "pix_fmt": "yuv420p",
  
              "level": 30,
  
              "chroma_location": "left",
  
              "refs": 5,
  
              "is_avc": "true",
  
              "nal_length_size": "4",
  
              "r_frame_rate": "25/1",
  
              "avg_frame_rate": "25/1",
  
              "time_base": "1/1000",
  
              "start_pts": 80,
  
              "start_time": "0.080000",
  
              "bit_rate": "400000",
  
              "bits_per_raw_sample": "8",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0
  
              }
  
          },
  
          {
  
              "index": 1,
  
              "codec_name": "aac",
  
              "codec_long_name": "AAC (Advanced Audio Coding)",
  
              "profile": "LC",
  
              "codec_type": "audio",
  
              "codec_time_base": "1/44100",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "sample_fmt": "fltp",
  
              "sample_rate": "44100",
  
              "channels": 2,
  
              "channel_layout": "stereo",
  
              "bits_per_sample": 0,
  
              "r_frame_rate": "0/0",
  
              "avg_frame_rate": "0/0",
  
              "time_base": "1/1000",
  
              "start_pts": 241,
  
              "start_time": "0.241000",
  
              "bit_rate": "96000",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0
  
              }
  
          }
  
      ],
  
      "format": {
  
          "filename": "vid2.flv",
  
          "nb_streams": 2,
  
          "nb_programs": 0,
  
          "format_name": "flv",
  
          "format_long_name": "FLV (Flash Video)",
  
          "start_time": "0.080000",
  
          "duration": "371.920000",
  
          "size": "23876671",
  
          "bit_rate": "513587",
  
          "probe_score": 100,
  
          "tags": {
  
              "audiosize": "4476626",
  
              "canSeekToEnd": "true",
  
              "datasize": "23876671",
  
              "videosize": "19004263",
  
              "hasAudio": "true",
  
              "hasCuePoints": "false",
  
              "hasKeyframes": "true",
  
              "hasMetadata": "true",
  
              "hasVideo": "true",
  
              "lasttimestamp": "372",
  
              "metadatacreator": "flvtool++ (Facebook, Motion project, dweatherford)",
  
              "totalframes": "9298",
  
              "encoder": "Lavf56.36.100"
  
          }
  
      }
  
  }

  Here’s my command :

  -i prefix.mp4 -b:v 400k -b:a 96k -r 25 -ar 44100 -acodec aac -vf scale=646:364 -strict -2 prefix.flv.

  This produces the following output (as well as the video file) :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (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      55.  4.100 / 55.  4.100
  
    libavcodec     57.  7.100 / 57.  7.100
  
    libavformat    57.  8.102 / 57.  8.102
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 12.100 /  6. 12.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'prefix.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.8.102
  
    Duration: 00:00:05.31, start: 0.000000, bitrate: 1589 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1205 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 384 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, flv, to 'prefix.flv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.8.102
  
      Stream #0:0(und): Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 646x364 [SAR 2912:2907 DAR 16:9], q=2-31, 400 kb/s, 25 fps, 1k tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.7.100 flv
  
      Stream #0:1(und): Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, 5.1, fltp, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.7.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> flv1 (flv))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=   79 fps=0.0 q=10.7 size=     381kB time=00:00:03.43 bitrate= 908.7kbits/frame=  132 fps=0.0 q=10.1 Lsize=     548kB time=00:00:05.31 bitrate= 844.1kbits/s
  
  video:479kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.161623%
  
  [aac @ 0000021aa893eae0] Qavg: 177.292

  I then run the outputted video file and it runs just like the old one.

  I then concatenate the ouputted intro file with my main video file using the following command (tmp.txt contains the 2 files) :

  -f concat -i tmp.txt -c copy newvid.flv

  This produces the following output :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (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      55.  4.100 / 55.  4.100
  
    libavcodec     57.  7.100 / 57.  7.100
  
    libavformat    57.  8.102 / 57.  8.102
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 12.100 /  6. 12.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, concat, from 'tmp.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 496 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 646x364, 400 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC), 44100 Hz, 5.1, fltp, 96 kb/s
  
  [flv @ 00000257b5f0e180] Codec for stream 0 does not use global headers but container format requires global headers
  
  [flv @ 00000257b5f0e180] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, flv, to 'newvid.flv':
  
    Metadata:
  
      encoder         : Lavf57.8.102
  
      Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 646x364, q=2-31, 400 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, 5.1, 96 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [flv @ 00000257b56947e0] Packet mismatch 486539264 7424
  
  [flv @ 00000257b56947e0] Auto-inserting h264_mp4toannexb bitstream filter
  
  [flv @ 00000257b5f0e180] Non-monotonous DTS in output stream 0:0; previous: 5263, current: 5255; changing to 5263. This may result in incorrect timestamps in the output file.
  
  frame= 6359 fps=0.0 q=-1.0 size=   15906kB time=00:04:14.30 bitrate= 512.4kbits/frame= 9428 fps=0.0 q=-1.0 Lsize=   23835kB time=00:06:17.05 bitrate= 517.8kbits/s
  
  video:19016kB audio:4403kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.777447%

  When I try to run the final video (newvid.flv) it plays like this :

  It starts off playing the intro just fine.
  However, when the intro is finished the video freezes while the sound of the actual video continues for the entire duration of the video.

  Thus in conclusion what is lacking is the video of the second vid (the audio is fine).

  I’m new at using ffmpeg but I’ve tried my best to solve this, which is why I’m asking for your help.

  I’d certainly appreciate if someone could help me out.