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  • ffmep merge multiple (N) mono audio channels of a MXF video to multiple (M) stereo channels of MP4 video

    13 February 2020, by Laura

    I have an MXF file with 16 audio mono streams and I need to recode it in a mp4 file with 2<=n<=16 channels merging input streams, e.g. input channels 1 and 2 on output channel 1 and 9 and 10 on output channel 2. This job will be done with ffmpeg. I read the documentation and found the amerge and amix filters that would be nice, but they output one channel only. Is there any solution for this problem?

    Thanks, Laura

    Find below the output of ffprobe on mxf file:

    { "streams":[ { "index":0, "codec_name":"mpeg2video", "codec_long_name":"MPEG-2 video", "profile":"4:2:2", "codec_type":"video", "codec_time_base":"1/25", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "width":1920, "height":1080, "coded_width":0, "coded_height":0, "has_b_frames":1, "sample_aspect_ratio":"1:1", "display_aspect_ratio":"16:9", "pix_fmt":"yuv422p", "level":2, "color_range":"tv", "color_space":"bt709", "color_transfer":"bt709", "color_primaries":"bt709", "chroma_location":"topleft", "field_order":"tt", "refs":1, "r_frame_rate":"25/1", "avg_frame_rate":"25/1", "time_base":"1/25", "start_pts":0, "start_time":"0.000000", "duration_ts":448, "duration":"17.920000", "bit_rate":"50000000", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":1, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":2, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":3, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":4, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":5, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":6, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":7, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } }, { "index":8, "codec_name":"pcm_s24le", "codec_long_name":"PCM signed 24-bit little-endian", "codec_type":"audio", "codec_time_base":"1/48000", "codec_tag_string":"[0][0][0][0]", "codec_tag":"0x0000", "sample_fmt":"s32", "sample_rate":"48000", "channels":1, "bits_per_sample":24, "r_frame_rate":"0/0", "avg_frame_rate":"0/0", "time_base":"1/48000", "start_pts":0, "start_time":"0.000000", "duration_ts":860160, "duration":"17.920000", "bit_rate":"1152000", "bits_per_raw_sample":"24", "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, "timed_thumbnails":0 }, "tags":{ "file_package_umid":"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989" } } ], "format":{ "filename":"/media-caches/video-essence/VIDEO/MXF-XDCAM_HD422@50Mbps1080i25_16Ch/941.mxf", "nb_streams":9, "nb_programs":0, "format_name":"mxf", "format_long_name":"MXF (Material eXchange Format)", "start_time":"0.000000", "duration":"17.920000", "size":"135028296", "bit_rate":"60280489", "probe_score":100, "tags":{ "uid":"0a9ef41a-36b4-4066-a8a3-b95f62299b6c", "generation_uid":"e134647e-fea1-4673-91c1-afa277d13c00", "company_name":"Sony", "product_name":"MPC", "product_version":"v1.0", "application_platform":"Sony MXF Development Kit (Win32)", "product_uid":"060e2b34-0401-0103-0e06-0120027f0200", "modification_date":"2012-09-17T11:56:20.000000Z", "material_package_umid":"0x060A2B340101010501010D231300000081C32F48A63347D4890F55D3ADC25B99", "timecode":"00:35:30:08" } } }

  • FFMPEG - Creating multiple copies of a video with different audio channels. Can't hear channel 4

    13 February 2020, by Gabriel_ris

    I'm working on a project where I need to have 6 copies of a video, where each copy only plays one audio channel. The original video has only 2 channel, with the same audio on each channel. First I had to copy one of the channels into the other 4 missing channels. I'm new to ffmpeg, I did some research and I used this command:

    ffmpeg -i input.mp4 -map_channel 0.1.0 -map_channel 0.1.0 -map_channel 0.1.0 -map_channel 0.1.0 -map_channel 0.1.0 -map_channel 0.1.0 -c:v copy output.mp4

    That helped to turn the video into a 6 channels one. Then, I revised the command for each channel:

    ffmpeg -i input.mp4 -map_channel 0.1.0 -map_channel -1 -map_channel -1 -map_channel -1 -map_channel -1 -map_channel -1 -c:v copy output_channel1.mp4

    ffmpeg -i input.mp4 -map_channel -1 -map_channel 0.1.0 -map_channel -1 -map_channel -1 -map_channel -1 -map_channel -1 -c:v copy output_channel2.mp4

    and so on.

    All the videos worked perfectly on their own channels, but channel 4, in which I can only hear some low noise. I read channel 4 is used for low frequency audio in 5.1 configuration, which might be the problem. I tried specifying the channel layout to 6.0, increasing the volume, disabling guess_layout_max, but nothing worked. As I said, I'm new to ffmpeg, and probably there is a much better way to do it. I'd appreciate if someone here could help me. Thanks!

  • How to convert raw H.264 stream from video call to mp4 file

    13 February 2020, by Daniel

    I have captured a SIP point to point video call using wireshark and I used the program 'videosnarf' on Ubuntu 12.04 to extract the raw H.264 stream from the PCAP. I am having some problems with ffmpeg when trying to convert it to MP4. Below is the ffprobe output:

    [STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
codec_type=video
codec_time_base=1/2400000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
width=704
height=396
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuv420p
level=51
r_frame_rate=25/1
avg_frame_rate=25/1
time_base=1/1200000
start_time=N/A
duration=N/A
[/STREAM]

    Here is the command I used to generate the MP4:

    ffmpeg -f h264 -i H264-media-3.264 -vcodec copy output.mp4

    When I transfer the file to my Windows PC, I can't open the file in VLC. When opening in Windows Media Player (not sure the version but it's on Windows 8) it plays but very quickly (almost as if it's playing in fast forward. I also tried with:

    ffmpeg -f h264 -i H264-media-3.264 -vcodec copy -r 25 output.mp4

    I am able to play the raw H.264 stream using "MPC-HC" on Windows but I need it in MP4 format.

  • Non stop stream to rtmp with FFMPEG

    13 February 2020, by Надежда Перемен

    I want to stream to RTMP with FFMPEG. I need to dynamically change next play file, for that i use web urls for my localhost.

    I have PHP file located: http://127.0.0.1/mp3.php

    $file = '1.mp3';

$mime_type = "audio/mpeg, audio/x-mpeg, audio/x-mpeg-3, audio/mpeg3";

if(file_exists($file)){
    header('Content-type: {$mime_type}');
    header('Content-length: ' . filesize($file));
    header('Content-Disposition: filename="' . $file);
    header('X-Pad: avoid browser bug');
    header('Cache-Control: no-cache');
    readfile($file);
}else{
    header("HTTP/1.0 404 Not Found");
}

    And i run ffmpeg with this command line:

    ffmpeg -re -stream_loop -1 -i logo.png -stream_loop -1 -i http://127.0.0.1/mp3.php -ab 320k -c:v libx264 -f flv "rtmp://ms......."

    This works, but it playing only once time and FFMPEG returns an error:

    Seek to start failed http://127.0.0.1/mp3.php: Function not implemented

    How can i fix it?

  • How to convert 4:3 stream to 16:9 using ffmpeg

    13 February 2020, by DavidBill7

    Can somebody please help me?

    I need to convert an analog camera stream to 16:9. At the moment it's portraying at 4:3.

    The code I'm using is below. 

    ffmpeg -hide_banner -re -i  {{OUTPUT_FILENAME}} -vcodec h264_qsv -preset slower -s 1280x720 -vsync 1 -async 1 -r 25 -b:v 650K -minrate:v 650K -maxrate:v 650K -acodec aac -ac 2 -ar 48000 -ab 128k -bsf:v 'filter_units=pass_types=1-5'  -map 0 -g 50 -flags -global_header -f flv rtmp://

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