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  • Python program which reads and extracts specific information from JSON file generated by FFPROBE

    3 février 2017, par Georgе Stoyanov

    I want to create a simple Python script, which runs a custom ffprobe script and then extracts some specific information from the generated JSON file. So the ffprobe command is :

    ffprobe -v quiet -print_format json -show_format -show_streams example.mp4 > output.json

    This command is extracting the video specific information into output.json file. Then I want to read the file and extract some specific information out of it. For example the JSON file has the following format :

    {
    
    "streams": [
    
        {
    
            "index": 0,
    
            "codec_name": "h264",
    
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    
            "profile": "High 4:2:2 Intra",
    
            "codec_type": "video",
    
            "codec_time_base": "1/100",
    
            "codec_tag_string": "[0][0][0][0]",
    
            "codec_tag": "0x0000",
    
            "width": 3840,
    
            "height": 2160,
    
            "coded_width": 3840,
    
            "coded_height": 2160,
    
            "has_b_frames": 0,
    
            "sample_aspect_ratio": "1:1",
    
            "display_aspect_ratio": "16:9",
    
            "pix_fmt": "yuv422p10le",
    
            "level": 52,
    
            "color_range": "tv",
    
            "color_space": "bt709",
    
            "color_transfer": "bt709",
    
            "color_primaries": "bt709",
    
            "chroma_location": "left",
    
            "field_order": "progressive",
    
            "refs": 1,
    
            "is_avc": "false",
    
            "nal_length_size": "0",
    
            "r_frame_rate": "50/1",
    
            "avg_frame_rate": "50/1",
    
            "time_base": "1/50",
    
            "start_pts": 0,
    
            "start_time": "0.000000",
    
            "duration_ts": 15000,
    
            "duration": "300.000000",
    
            "bits_per_raw_sample": "10",
    
            "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": "0x060A2B340101010501010D0013EC94F152947134B6EC94F10052947134B6EC01",
    
                "file_package_name": "Source Package"
    
            }
    
        }
    
    ],
    
    "format": {
    
        "filename": "300sec.mxf",
    
        "nb_streams": 1,
    
        "nb_programs": 0,
    
        "format_name": "mxf",
    
        "format_long_name": "MXF (Material eXchange Format)",
    
        "start_time": "0.000000",
    
        "duration": "300.000000",
    
        "size": "16772788991",
    
        "bit_rate": "447274373",
    
        "probe_score": 100,
    
        "tags": {
    
            "uid": "adab4424-2f25-4dc7-92ff-29bd000c0000",
    
            "generation_uid": "adab4424-2f25-4dc7-92ff-29bd000c0001",
    
            "company_name": "FFmpeg",
    
            "product_name": "OP1a Muxer",
    
            "product_version": "57.66.101",
    
            "product_uid": "adab4424-2f25-4dc7-92ff-29bd000c0002",
    
            "modification_date": "0-01-02T00:00:00.000000Z",
    
            "material_package_umid": "0x060A2B340101010501010D0013EC94F152947134B6EC94F10052947134B6EC00",
    
            "timecode": "00:00:00:00"
    
        }
    
    }
    
}

    Perfect will be if the Python script runs and then asks you for the path to the input file.

    Unfortunately I have very little experience with Python, but it comes pre-installed on my system and I want to use it. The other option is to write a bash script doing the same. Any suggestions will be greatly appreciated.

    So far I have figured out how I can open the JSON file and to extract data from it using :

    import json
    

    
with open('output.json') as json_data:
    
    data = json.load(json_data)
    
    json_data.close()
    
    print(data["streams"][0]["codec_name"])
    
    print(data["streams"][0]["profile"])

  • convert video with ffmpeg command line. but the video stream and audio stream are out of sync

    24 juin 2016, par zack chen

    I use ffmpeg cmd to convert some mkv video files to flv.

    The source files are downloaded from this site : Sample mkv files

    ffmpeg -i input.mkv -c:v libx264 -crf 20 -preset ultrafast -c:a aac -ar 22050 -y output.flv

    However the output video seems lose some frames, the FPS dropped from 25 to 5 suddenly and The video stream and audio stream are out of sync.

    I tested some mkv files downloaded from another site, the output file could play well.
    So, I guess it may be caused by the mkv files downloaded from the site : http://www.sample-videos.com/index.php#sample-mkv-video

    But i couldn’t find the reason. Could you help me ?

    I get the video info by ffprobe, as below.

    {
    
"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": "1/50",
    
        "codec_tag_string": "[0][0][0][0]",
    
        "codec_tag": "0x0000",
    
        "width": 320,
    
        "height": 240,
    
        "coded_width": 320,
    
        "coded_height": 240,
    
        "has_b_frames": 0,
    
        "sample_aspect_ratio": "1:1",
    
        "display_aspect_ratio": "4:3",
    
        "pix_fmt": "yuv420p",
    
        "level": 20,
    
        "chroma_location": "left",
    
        "refs": 1,
    
        "is_avc": "true",
    
        "nal_length_size": "4",
    
        "r_frame_rate": "25/1",
    
        "avg_frame_rate": "25/1",
    
        "time_base": "1/1000",
    
        "duration_ts": 9818,
    
        "duration": "9.818000",
    
        "bits_per_raw_sample": "8",
    
        "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
    
        }
    
    },
    
    {
    
        "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": "[0][0][0][0]",
    
        "codec_tag": "0x0000",
    
        "sample_fmt": "fltp",
    
        "sample_rate": "48000",
    
        "channels": 6,
    
        "channel_layout": "5.1",
    
        "bits_per_sample": 0,
    
        "r_frame_rate": "0/0",
    
        "avg_frame_rate": "0/0",
    
        "time_base": "1/1000",
    
        "duration_ts": 9818,
    
        "duration": "9.818000",
    
        "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
    
        }
    
    }
    
],
    
"format": {
    
    "filename": "big_buck_bunny_240p_1mb.mkv",
    
    "nb_streams": 2,
    
    "nb_programs": 0,
    
    "format_name": "matroska,webm",
    
    "format_long_name": "Matroska / WebM",
    
    "duration": "9.818000",
    
    "size": "1055721",
    
    "bit_rate": "860233",
    
    "probe_score": 100,
    
    "tags": {
    
        "ENCODER": "Lavf53.24.2"
    
    }
    
}
    
}

  • How to encode H.264 video using FFmpeg C API and then open the output with a media player ?

    4 avril 2016, par GummiB

    I’m trying to encode a H.264 video with the FFMPEG C API.
    I have successfully compiled and executed the decoding/encoding example provided by FFMPEG.

    The problem I’m facing is that the .mpg file (encoded with AV_CODEC_ID_MPEG1VIDEO) the example creates works. Windows creates a thumbnail and everything. On the other hand the .h264 (encoded with AV_CODEC_ID_H264) file does not. When I try to play the file in VLC the play/pause button just flickers, no thumbnail in windows, no nothing.

    During encoding libx264 reports the following :

    [libx264 @ 004b81a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 004b81a0] profile High, level 1.3
    
[libx264 @ 004b81a0] frame I:3     Avg QP:26.79  size:  2116
    
[libx264 @ 004b81a0] frame P:12    Avg QP:26.60  size:   789
    
[libx264 @ 004b81a0] frame B:10    Avg QP:31.39  size:   499
    
[libx264 @ 004b81a0] consecutive B-frames: 20.0% 80.0%
    
[libx264 @ 004b81a0] mb I  I16..4: 78.3% 11.6% 10.1%
    
[libx264 @ 004b81a0] mb P  I16..4: 77.4%  0.6%  0.1%  P16..4: 20.3%  0.7%  0.9%  0.0%  0.0%    skip: 0.0%
    
[libx264 @ 004b81a0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  9.4%  0.2%  0.0%  direct:11.0%  skip:79.4%  L0:25.4% L1:35.4% BI:39.2%
    
[libx264 @ 004b81a0] final ratefactor: 17.03
    
[libx264 @ 004b81a0] 8x8 transform intra:3.4% inter:31.3%
    
[libx264 @ 004b81a0] direct mvs  spatial:0.0% temporal:100.0%
    
[libx264 @ 004b81a0] coded y,uvDC,uvAC intra: 4.4% 35.8% 1.6% inter: 1.3% 34.5% 9.5%
    
[libx264 @ 004b81a0] i16 v,h,dc,p:  0%  0%  0% 100%
    
[libx264 @ 004b81a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 20% 17% 49%  0%  0%  0%  1%  6%
    
[libx264 @ 004b81a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14%  7% 18% 45%  2%  7%  2%  3%  2%
    
[libx264 @ 004b81a0] i8c dc,h,v,p:  2%  6%  4% 88%
    
[libx264 @ 004b81a0] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 004b81a0] ref P L0: 95.6%  1.6%  2.2%  0.5%  0.2%
    
[libx264 @ 004b81a0] ref B L0: 67.5% 28.5%  3.2%  0.8%
    
[libx264 @ 004b81a0] kb/s:166.45

    "ffprobe.exe test.h264 -show_streams" returns

    [STREAM]
    
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=352
    
height=288
    
has_b_frames=1
    
sample_aspect_ratio=0:1
    
display_aspect_ratio=0:1
    
pix_fmt=yuv420p
    
level=13
    
timecode=N/A
    
id=N/A
    
r_frame_rate=50/2
    
avg_frame_rate=25/1
    
time_base=1/1200000
    
start_pts=N/A
    
start_time=N/A
    
duration_ts=N/A
    
duration=N/A
    
bit_rate=N/A
    
nb_frames=N/A
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
DISPOSITION:default=0
    
DISPOSITION:dub=0
    
DISPOSITION:original=0
    
DISPOSITION:comment=0
    
DISPOSITION:lyrics=0
    
DISPOSITION:karaoke=0
    
DISPOSITION:forced=0
    
DISPOSITION:hearing_impaired=0
    
DISPOSITION:visual_impaired=0
    
DISPOSITION:clean_effects=0
    
DISPOSITION:attached_pic=0
    
[/STREAM]

    There you can see :

    start_time=N/A
    
duration_ts=N/A
    
duration=N/A

    I have tried countless changes to the AVCodecContext and multitude of parameters options to av_opt_set function. Still no luck getting a working H.264 video. I have even tried different builds of FFmpeg. No luck.

    I’m using the "FFmpeg git-0fb64da 32-bit Dev" build from Zeranoe and MinGw 4.7.2

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