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  • Ubuntu push rtmp video and audio to v4l2loopback and snd-dummy devices

    15 août 2018, par Dangel

    I currently have a RTMP stream going on and I want to take that stream and push it to a v4l2loopback virtual camera and a snd-dummy sound device.

    I've created the virtual devices for video and audio using v4l2loopback and snd-dummy kernel modules.

    I've already managed to push the video to the virtual camera using:

    ffmpeg -i rtmp://192.168.x.x:xxxx/stream/stream_id -f v4l2 /dev/video10

    Now I need to do the same for the virtual microphone, tried adding this to the command but didn't work

    -f alsa hw:2

    Now it seems like it's pushing the audio to the device but I see no activity in alsamixer or volume control and can't find the audio device to use it for example as an audio source in OBS.

    How can I push the audio to the device and use it to stream to a flash page?

  • mid-roll ads in HLS or mpeg-dash [on hold]

    15 août 2018, par evan

    I'm encoding my videos with ffmpeg and transcoding them into HLS videos. I want to add mid-roll ads to my converted videos.

    I was wondering what is the best way to do it? should I just add the ads to my video and make a big video stream and then do the HLS thing? or I should break the HLs video and put the ads in the middle while playing?

    My content is live streaming and I want to add mid-roll ads in the middle of my video while playing.

    ffmpeg -i main720.MTS -movflags faststart -s 640*360 -r 24 -vcodec libx264 -preset slow -tune zerolatency -tune fastdecode -b:v 300k -maxrate 300k -bufsize 400k -g 96 -an hls3/main720_300.mp4 -s 1280*720 -r 24 -vcodec libx264 -preset slow -tune zerolatency -tune fastdecode -b:v 700k -maxrate 700k -bufsize 1000k -g 96 -an hls3/main720_700.mp4 -hls_time 4 -hls_segment_filename 'hls3/file%03d.ts' -hls_list_size 0 hls3/out.m3u8

  • Need to convert file format then merge audio files in ffmpeg using bat file

    14 août 2018, par Matthew

    I have been searching quite a bit and cannot find the pieces to make this work. I am looking to convert .g729 audio files to .wav then merge 2 files, and IN and an OUT, into 1 file. I have this much working already.

    @echo off 
for %%A IN (*.g729) DO ffmpeg -i "%%A" "%%A.wav" done

    I have not been able to get the merge to work, I have the basic ffmpeg command to accomplish what I need but it isn't part of the loop.

    ffmpeg -i -in.wav -i -out.wav -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 output.wav

    Any input to get both into one batch would be very helpful.

  • How to reduce GIF file size with ffmpeg ?

    14 août 2018, par tvt tvt

    we use all command but not work properlly. how to reduce GIF file size convert mb to kb with ffmpeg commands?

  • 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

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