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  • Is there any way to specify streams by pid with ffmpeg, if the value of pid is duplicated ?

    22 novembre 2019, par Bo Wang

    I have a nice m2ts file and I would like to demux specific audio streams from it. Of important, this specification is needed to use PID as identifier.
    The exemplified m2ts file has 7 audio streams, which is detected by eac3to and shown below

    eac3to.exe F:\xxx 1)
    
M2TS, 1 video track, 7 audio tracks, 5 subtitle tracks, 1:40:03
    
1: Chapters, 34 chapters
    
2: h265/HEVC, 2160p24 /1.001 (16:9), 10 bits
    
3: TrueHD/AC3 (Atmos), English, 7.1 channels, 48kHz, dialnorm: -28dB
    
   (embedded: AC3, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB)
    
4: E-AC3, English, 7.1 channels, 1024kbps, 48kHz, dialnorm: -28dB
    
   (core: AC3, 5.1 channels, 576kbps, 48kHz, dialnorm: -28dB)
    
5: AC3, English, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB
    
6: AC3, English, 2.0 channels, 320kbps, 48kHz, dialnorm: -27dB
    
7: AC3, English, 2.0 channels, 320kbps, 48kHz, dialnorm: -27dB
    
8: AC3, Chinese, 2.0 channels, 448kbps, 48kHz
    
9: AC3, Chinese, 5.1 channels, 384kbps, 48kHz, 300ms
    
10: Subtitle (PGS), English
    
11: Subtitle (PGS), Chinese
    
12: Subtitle (PGS), Chinese
    
13: Subtitle (PGS), Chinese
    
14: Subtitle (PGS), Chinese

    However, if I run
    ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts", ffmpeg shows an additional audio stream as it recognizes the embedded 5.1 AC3 stream inside the 7.1 TrueHD audio stream, as independent :

    Input #0, mpegts, from 'F:\xxx\BDMV\STREAM\00055.m2ts':
    
  Duration: 00:00:48.62, start: 4198.333333, bitrate: 50005 kb/s
    
  Program 1
    
    Stream #0:0[0x1011]: Video: hevc (Main 10) (HDMV / 0x564D4448), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 23.98 tbc
    
    Stream #0:1[0x1100]: Audio: truehd (AC-3 / 0x332D4341), 48000 Hz, 7.1, s32 (24 bit)
    
    Stream #0:2[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
    
    Stream #0:3[0x1101]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
    
    Stream #0:4[0x1102]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
    
    Stream #0:5[0x1103]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
    
    Stream #0:6[0x1104]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
    
    Stream #0:7[0x1105]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 448 kb/s
    
    Stream #0:8[0x1106]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
    
    Stream #0:9[0x12a0]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:10[0x12a1]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:11[0x12a2]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:12[0x12a3]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:13[0x12a4]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)

    It can be found that the Stream #0:1 and Stream #0:2 have the same PID 0x1100. And ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts" -map i:0x1100 -c copy 00055-0x1100.thd will yield error :

    [truehd @ 0000021ae9517600] truehd files have exactly one stream
    
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
    
Stream mapping:
    
  Stream #0:1 -> #0:0 (copy)
    
  Stream #0:2 -> #0:1 (copy)
    
    Last message repeated 1 times

    By contrast, it works by giving other pids without duplication, such as ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts" -map i:0x1101 -c copy 00055-0x1101.eac3 :

    Input #0, mpegts, from 'F:\xxx\BDMV\STREAM\00055.m2ts':
    
  Duration: 00:00:48.62, start: 4198.333333, bitrate: 50005 kb/s
    
  Program 1
    
    Stream #0:0[0x1011]: Video: hevc (Main 10) (HDMV / 0x564D4448), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 23.98 tbc
    
    Stream #0:1[0x1100]: Audio: truehd (AC-3 / 0x332D4341), 48000 Hz, 7.1, s32 (24 bit)
    
    Stream #0:2[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
    
    Stream #0:3[0x1101]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
    
    Stream #0:4[0x1102]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
    
    Stream #0:5[0x1103]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
    
    Stream #0:6[0x1104]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
    
    Stream #0:7[0x1105]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 448 kb/s
    
    Stream #0:8[0x1106]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
    
    Stream #0:9[0x12a0]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:10[0x12a1]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:11[0x12a2]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:12[0x12a3]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
    Stream #0:13[0x12a4]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
    
Output #0, eac3, to '00055-0x1101.eac3':
    
  Metadata:
    
    encoder         : Lavf58.34.101
    
    Stream #0:0: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
    
Stream mapping:
    
  Stream #0:3 -> #0:0 (copy)
    
Press [q] to stop, [?] for help
    
size=    6076kB time=00:00:48.57 bitrate=1024.7kbits/s speed=92.6x
    
video:0kB audio:6076kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

    In this case, how can I specify the streams by PID ?

  • Cannot open ".mp4" video files using OpenCV 2.4.3, Python 2.7 in Windows 7 machine

    28 décembre 2015, par tjmonsi

    I am currently working on a project that involves reading mp4 video files.
    The problem I encountered is that it using Python 2.7 (32 bit), OpenCV 2.4.3 (cv2.pyd) in a Windows 7 machine.

    The code snippet is as follows :

    try:
    
        video = cv2.VideoCapture("video.mp4")
    
except:
    
        print "Could not open video file"
    
        raise
    
print video.grab()

    "video.grab()" always returns false : meaning it doesn’t read the file "video.mp4"
    But when we try this :

    try:
    
        video = cv2.VideoCapture("video.avi")
    
except:
    
        print "Could not open video file"
    
        raise
    
print video.grab()

    "video.grab()" returns true : meaning it is able to read ".avi" files.

    Another is we have tried this same snippet on Linux and Mac and it seems to work fine, meaning it is able to read both mp4 files and avi files.

    This problem is similar to this problem and this problem. Both still don’t have a clear and workable answer.

    I would appreciate any help or workaround aside from just using Linux or Mac for programming this as I need this to work on all three systems.

  • Cannot open ".mp4" video files using OpenCV 2.4.3, Python 2.7 in Windows 7 machine

    24 octobre 2017, par TJ Monserrat

    I am currently working on a project that involves reading mp4 video files.
    The problem I encountered is that it using Python 2.7 (32 bit), OpenCV 2.4.3 (cv2.pyd) in a Windows 7 machine.

    The code snippet is as follows :

    try:
    
        video = cv2.VideoCapture("video.mp4")
    
except:
    
        print "Could not open video file"
    
        raise
    
print video.grab()

    "video.grab()" always returns false : meaning it doesn’t read the file "video.mp4"
    But when we try this :

    try:
    
        video = cv2.VideoCapture("video.avi")
    
except:
    
        print "Could not open video file"
    
        raise
    
print video.grab()

    "video.grab()" returns true : meaning it is able to read ".avi" files.

    Another is we have tried this same snippet on Linux and Mac and it seems to work fine, meaning it is able to read both mp4 files and avi files.

    This problem is similar to this problem and this problem. Both still don’t have a clear and workable answer.

    I would appreciate any help or workaround aside from just using Linux or Mac for programming this as I need this to work on all three systems.

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