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• ffmpeg determine correct codec to use

  8 avril 2020, par nha

  I am trying to use .y4m files that I feed into Chrome for playing.
This is the only format that I can use.

  



  I have a set of .y4m files that are working for my use case, taken from here.
For example let's say that I use the file mobile_qcif_7.5fps.y4m.

  



  I also have a .mp4 file (specifically the sample small.mp4 file from techslides ). I know how to convert small.mp4 to small.y4m with the following command :

  



  ffmpeg -y -i small.mp4 small.y4m

  



  I would like the resulting file to be accepted by Chrome, just like the other file.
What options should I use (and how to find them) ?

  



  Additional information

  



  ffprobe gives :

  



  $ ffprobe small.y4m 
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
[yuv4mpegpipe @ 0x23160c0] Estimating duration from bitrate, this may be inaccurate
Input #0, yuv4mpegpipe, from 'small.y4m':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 560x320, 30 fps, 30 tbr, 30 tbn, 30 tbc


$ ffprobe mobile_qcif_7.5fps.y4m
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
[yuv4mpegpipe @ 0x1e080c0] max_analyze_duration reached
[yuv4mpegpipe @ 0x1e080c0] Estimating duration from bitrate, this may be inaccurate
Input #0, yuv4mpegpipe, from 'mobile_qcif_7.5fps.y4m':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 176x144, PAR 128:117 DAR 1408:1053, 7.50 fps, 7.50 tbr, 7.50 tbn, 7.50 tbc


  



  OS : I am using ffmpeg in Ubuntu 13.10 from the default repository : I ran sudo apt-get install ffmpeg libavcodec-extra-53

  



  Complete console output

  



  $ ffmpeg -y -i small.mp4 small.y4m
ffmpeg version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2000-2014 the Libav developers
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2010-03-20 21:29:11
    encoder         : HandBrake 0.9.4 2009112300
  Duration: 00:00:05.56, start: 0.000000, bitrate: 551 kb/s
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
    Metadata:
      creation_time   : 2010-03-20 21:29:11
    Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 83 kb/s
    Metadata:
      creation_time   : 2010-03-20 21:29:11
[buffer @ 0x7274e0] w:560 h:320 pixfmt:yuv420p
Output #0, yuv4mpegpipe, to 'small.y4m':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2010-03-20 21:29:11
    encoder         : Lavf53.21.1
    Stream #0.0(und): Video: rawvideo, yuv420p, 560x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
    Metadata:
      creation_time   : 2010-03-20 21:29:11
Stream mapping:
  Stream #0.0 -> #0.0
Press ctrl-c to stop encoding
frame=  166 fps=  0 q=0.0 Lsize=   43576kB time=5.53 bitrate=64513.5kbits/s    
video:0kB audio:0kB global headers:0kB muxing overhead inf%


  



  Head of the files

  



  Not sure if this is relevant, but the text content of both files begin like that :

  



  mobile_qcif_7.5fps.y4m
YUV4MPEG2 W176 H144 F15:2 Ip A128:117
FRAME

small.y4m (invalid)
YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
FRAME


  



  Additional experiment

  



  Taking the sample mobile_qcif_7.5fps.y4m, turning it into a .mp4 file and then back into a .y4m produces an invalid file (at least for Chrome).

  



  Answer to comments in the answer of @SirDarius

  



  Following the suggestion of @SirDarius ; I tried the following commands.
They failed to produce a valid file.

  



  # [COMMAND]   # [RESULT] [HEADER]
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv444p -y small_yuv444p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C444 XYSCSS=444
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv422p -y small_yuv422p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C422 XYSCSS=422
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p -y small_yuv420p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv411p -y small_yuv411p.y4m   # KO   YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C411 XYSCSS=411

ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p9 -y small_yuv420p9.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p9 XYSCSS=420P9
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p12 -y small_yuv420p12.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p12 XYSCSS=420P12
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p14 -y small_yuv420p14.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p14 XYSCSS=420P14
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p16 -y small_yuv420p16.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p16 XYSCSS=420P16


  



  When trying other formats (like yuv420p12be, which was in the output of -pix_fmts), I had the following output (hence my previous trials) :

  



  $  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p12be -y small_yuv420p12be.y4m 
ffmpeg version N-68884-g3ebd76a Copyright (c) 2000-2015 the FFmpeg developers
  built on Jan  6 2015 11:03:21 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  configuration: 
  libavutil      54. 16.100 / 54. 16.100
  libavcodec     56. 19.100 / 56. 19.100
  libavformat    56. 18.100 / 56. 18.100
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  6.100 /  5.  6.100
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x21d0220] overread end of atom 'colr' by 1 bytes
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    creation_time   : 2010-03-20 21:29:11
    encoder         : HandBrake 0.9.4 2009112300
  Duration: 00:00:05.57, start: 0.000000, bitrate: 551 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2010-03-20 21:29:11
      encoder         : JVT/AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
    Metadata:
      creation_time   : 2010-03-20 21:29:11
[yuv4mpegpipe @ 0x21d8180] ERROR: yuv4mpeg can only handle yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, yuv444p10, yuv422p10, yuv420p10, yuv444p12, yuv422p12, yuv420p12, yuv444p14, yuv422p14, yuv420p14, yuv444p16, yuv422p16, yuv420p16 and gray16 pixel formats. Use -pix_fmt to select one.
Output #0, yuv4mpegpipe, to 'small_yuv420p12be.y4m':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isomavc1
    encoder         : Lavf56.18.100
    Stream #0:0(und): Video: rawvideo ([12][11]3Y / 0x59330B0C), yuv420p12be, 560x320, q=2-31, 200 kb/s, 7.50 fps, 7.50 tbn, 7.50 tbc (default)
    Metadata:
      creation_time   : 2010-03-20 21:29:11
      encoder         : Lavc56.19.100 rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
Could not write header for output file #0 (incorrect codec parameters ?): Input/output error


  



  After that, I also tried to edit with an hexadecimal editor (bless) the small_yuv420p.y4m file. I replace C420mpeg2 by C420, and the file was accepted by Chrome.
What does the number in 420p[number] correspond to ? It is not explained there.
Is there any way to make ffmpeg output this kind of header files ?

  



  @SirDarius, thank you again for your help.

  



  The question

  



  (in case you forgot after this text blob)

  



  How can I convert the small.mp4 into a small.y4m file that has the same properties as the mobile_qcif_7.5fps.y4m file ?

  


• Picture in picture problem on output stream in FFMPEG

  7 mai 2020, par mat thew

  I have a problem with ffmpeg output video.

  



  I am using Raspberry Pi to connect video (stream with IP camera) and audio. Its work fine.
I would like to add to my output video another video with second camera (in left-top side).

  



  Graphics it is looks like :

  



  _________________
| |_2_|         |
|               |
|        1      |
|_______________|


  



  1 is head video, 2 is video to add

  



  that is my code to situation with top :

  



  /home/pi/FFmpeg/ffmpeg -y -thread_queue_size 512K \
-re -vsync 1 -rtsp_transport tcp -itsoffset 0 -use_wallclock_as_timestamps 1 \
-i "rtsp://admin:admin@172.16.7.7:554/cam/realmonitor?channel=1&subtype=0" \
-thread_queue_size 512K -i "rtsp://video:video@172.16.7.8:554/cam/realmonitor?channel=1&subtype=0" \
-filter_complex "[1]scale=iw/3:ih/3 [pip]; [0][pip] overlay=3:3" \
-ar 44100 -itsoffset 1.5 -ac 2 -f alsa -ac 2 -thread_queue_size 512K -i default -f h264 \
-c:a aac -ab 128k -g 50 -strict -2 -f flv rtmp://127.0.0.1/sesja/transmisja


  



  Stream is running, however number of fps is 4-5, speed is 0.3 what makes it output stream does not work properly.

  



  I am asking from help in configuration, maybe Raspberry does not support this solution in hardware.

  



  FULL LOG :

  



  ffmpeg version N-92540-g28c96c2ce2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1+deb9u1) 20170516
  configuration: --arch=armel --target-os=linux --enable-gpl --enable-omx --enable-omx-rpi --enable-nonfree --enable-indev=alsa --enable-outdev=alsa
  libavutil      56. 24.101 / 56. 24.101
  libavcodec     58. 40.100 / 58. 40.100
  libavformat    58. 23.100 / 58. 23.100
  libavdevice    58.  6.100 / 58.  6.100
  libavfilter     7. 46.100 /  7. 46.100
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, rtsp, from 'rtsp://admin:admin@172.16.7.7:554/cam/realmonitor?channel=1&subtype=0':
  Metadata:
    title           : RTSP Session/2.0
  Duration: N/A, start: 1588833830.370000, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 20 fps, 20 tbr, 90k tbn, 40 tbc
[rtsp @ 0x31cc480] max delay reached. need to consume packet
[rtsp @ 0x31cc480] RTP: missed 35 packets
[rtsp @ 0x31cc480] max delay reached. need to consume packet
[rtsp @ 0x31cc480] RTP: missed 7 packets
[h264 @ 0x31e4180] concealing 3081 DC, 3081 AC, 3081 MV errors in I frame
[rtsp @ 0x31cc480] max delay reached. need to consume packet
[rtsp @ 0x31cc480] RTP: missed 34 packets
[h264 @ 0x31e4180] error while decoding MB 30 1, bytestream -11
[h264 @ 0x31e4180] concealing 3539 DC, 3539 AC, 3539 MV errors in P frame
[rtsp @ 0x31cc480] max delay reached. need to consume packet
[rtsp @ 0x31cc480] RTP: missed 13 packets
Input #1, rtsp, from 'rtsp://video:video@172.16.7.8:554/cam/realmonitor?channel=1&subtype=0':
  Metadata:
    title           : RTSP Session/2.0
  Duration: N/A, start: 0.430000, bitrate: N/A
    Stream #1:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 20 fps, 100 tbr, 90k tbn, 40 tbc
Guessed Channel Layout for Input Stream #2.0 : stereo
Input #2, alsa, from 'default':
  Duration: N/A, start: 1588833833.133715, bitrate: 1411 kb/s
    Stream #2:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
  Stream #0:0 (h264) -> overlay:main (graph 0)
  Stream #1:0 (h264) -> scale (graph 0)
  overlay (graph 0) -> Stream #0:0 (flv)
  Stream #2:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[h264 @ 0x3389140] concealing 3081 DC, 3081 AC, 3081 MV errors in I frame
[rtsp @ 0x31cc480] max delay reached. need to consume packet
[rtsp @ 0x31cc480] RTP: missed 51 packets
[swscaler @ 0x3b3b6f0] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x3b56cf0] deprecated pixel format used, make sure you did set range correctly
Output #0, flv, to 'rtmp://127.0.0.1/sesja/transmisja':
  Metadata:
    title           : RTSP Session/2.0
    encoder         : Lavf58.23.100
    Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 20 fps, 1k tbn, 20 tbc (default)
    Metadata:
      encoder         : Lavc58.40.100 flv
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.40.100 aac
frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   [h264 @ 0x3831c40] error while decoding MB 30 1, bytestream -11
[h264 @ 0x3831c40] concealing 3539 DC, 3539 AC, 3539 MV errors in P frame
frame=    2 fps=1.5 q=2.0 size=       0kB time=00:00:00.05 bitrate=  57.9kbits/s[h264 @ 0x384a1a0] error while decoding MB 64 6, bytestream -13
[h264 @ 0x384a1a0] concealing 3105 DC, 3105 AC, 3105 MV errors in P frame
frame=    6 fps=2.8 q=7.0 size=     265kB time=00:00:01.50 bitrate=1447.5kbits/sframe=    9 fps=3.3 q=15.5 size=     270kB time=00:00:01.50 bitrate=1472.7kbits/frame=   13 fps=3.7 q=26.4 size=     274kB time=00:00:01.50 bitrate=1496.4kbits/frame=   15 fps=3.6 q=30.2 size=     276kB time=00:00:01.50 bitrate=1507.6kbits/frame=   17 fps=3.6 q=31.0 size=     278kB time=00:00:01.50 bitrate=1518.9kbits/frame=   20 fps=3.6 q=31.0 size=     284kB time=00:00:01.50 bitrate=1551.1kbits/[h264 @ 0x3389140] error while decoding MB 42 4, bytestream -5
[h264 @ 0x3389140] concealing 3287 DC, 3287 AC, 3287 MV errors in P frame
frame=   23 fps=3.7 q=31.0 size=     287kB time=00:00:01.50 bitrate=1568.5kbits/frame=   24 fps=3.6 q=31.0 size=     288kB time=00:00:01.50 bitrate=1574.1kbits/frame=   60 fps=5.7 q=31.0 size=     295kB time=00:00:02.95 bitrate= 817.9kbits/frame=   62 fps=5.5 q=31.0 size=     418kB time=00:00:03.05 bitrate=1121.3kbits/frame=   62 fps=5.2 q=31.0 size=     419kB time=00:00:03.07 bitrate=1114.9kbits/frame=   62 fps=5.0 q=31.0 size=     419kB time=00:00:03.07 bitrate=1114.9kbits/frame=   62 fps=4.8 q=31.0 size=     419kB time=00:00:03.07 bitrate=1114.9kbits/frame=   62 fps=4.6 q=31.0 size=     419kB time=00:00:03.07 bitrate=1114.9kbits/frame=   62 fps=4.4 q=31.0 size=     419kB time=00:00:03.07 bitrate=1114.9kbits/frame=   62 fps=4.2 q=31.0 size=     419kB time=00:00:03.07 bitrate=1114.9kbits/frame=   63 fps=4.1 q=31.0 size=     419kB time=00:00:03.10 bitrate=1108.0kbits/frame=   65 fps=4.0 q=31.0 size=     424kB time=00:00:03.20 bitrate=1084.3kbits/frame=   68 fps=4.0 q=31.0 size=     429kB time=00:00:03.35 bitrate=1049.4kbits/frame=   71 fps=4.0 q=31.0 size=     435kB time=00:00:03.50 bitrate=1017.3kbits/frame=   74 fps=4.1 q=31.0 size=     441kB time=00:00:03.65 bitrate= 988.5kbits/frame=   77 fps=4.1 q=31.0 size=     446kB time=00:00:03.80 bitrate= 961.0kbits/frame=   80 fps=4.1 q=31.0 size=     452kB time=00:00:03.95 bitrate= 936.5kbits/frame=   83 fps=4.1 q=31.0 size=     457kB time=00:00:04.10 bitrate= 913.1kbits/frame=   85 fps=4.1 q=31.0 size=     461kB time=00:00:04.21 bitrate= 896.4kbits/frame=   88 fps=4.1 q=31.0 size=     467kB time=00:00:04.35 bitrate= 878.6kbits/frame=   91 fps=4.1 q=31.0 size=     473kB time=00:00:04.50 bitrate= 860.1kbits/[flv @ 0x37246b0] Failed to update header with correct duration.
[flv @ 0x37246b0] Failed to update header with correct filesize.
frame=   93 fps=4.0 q=31.0 Lsize=     478kB time=00:00:04.63 bitrate= 844.7kbits/s dup=38 drop=36 speed=0.202x    
video:425kB audio:49kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.859331%
[aac @ 0x3268610] Qavg: 185.380
Exiting normally, received signal 2.


  



  Thanks

  


• avformat/crypto.c : remove unnecessary code

  14 juillet 2020, par Steven Liu

  avformat/crypto.c : remove unnecessary code
  Because the newpos variable is set value before use it.
  
  The newpos variable declared at the head partition of crypto_seek.
  
  Make the code clean.
  Signed-off-by : Steven Liu <lq@chinaffmpeg.org>
  

  • [DH] libavformat/crypto.c