Sur d’autres sites (12367)

• FFmpeg source files wild card

  29 mars 2018, par Some1Else

  I am joining a series of image files into a movie file with FFmpeg.

  Files start at XYZ00000.PNG, XYZ00001.PNG etc. I refer to them as XYZ%05d.PNG in the FFmpeg command line.

  That works fine.

  But, if I delete the first (for example) 30 frames so my frame images start at XYZ00031.PNG onwards FFmpeg fails to build with an error ;

  [image2 @ 00000000043f2b40] Could find no file with path 'XYZ%05d.PNG' and index in the range 0-4
  
  XYZ%05d.PNG: No such file or directory

  Is there an alternate wildcard I can use to get FFmpeg to start at whatever the lowest numbered frame is ?

  If I rename XYZ00031.PNG to XYZ00000.PNG the build works, but only adds the single first frame. It ignores the other frames.

• Is it possible to force ffmpeg/libav decoder to output an H.264 frame with only current information ?

  19 mars 2018, par Andy Krouwel

  I’m currently using a slightly legacy version of ffmpeg/libav to decode H.264 frames.

  It decodes them with a call to :

  avcodec_decode_video2(context, &outPicture, &gotPicture, inNALPacket);

  For this I provide a series of NAL packets, and once it has ’enough’ it produces the image frame, as outPicture.

  So far, so good.

  However, sometimes (due to network issues) a packet/NAL goes missing.
  I can detect this.
  When this happens I would like to give up on this frame, and tell the decoder to just give me its best shot at the image, given the data so far.

  Is there any way of doing this ? eg. can I construct an inNALPacket that essentially tells the encoder to give up and move on ?

• ffmpeg : concat and encode with one command

  15 mars 2018, par Massimo Vantaggio

  I have a script that automates encode and concat a series of input video files.
  I’m trying to get encode and concat in a single command.

  At the moment it does not work causing immense empty pauses in the final video output.

  I would like to get the result with concat demux instead of concat protocol because it is much harder to automate in a script

  Do you know if it is possible to archive this result with concat demux ?
  Thanks a lot !

  Massimo

  ENCODE / CONCAT 1080p

  for f in ./*.mp4; do echo "file '$f'" >> list.txt; done
  
  
  
  ffmpeg -f concat -safe 0 -y -i list.txt -i ../logo/logo.png -c:a aac -b:a 384k -ar 48000 -ac 2 -af aresample=async=1000 -c:v libx264 -x264opts keyint=50:min-keyint=50:no-scenecut -bf 0 -r 25 -b:v 4800k -maxrate 4800k -bufsize 3000k -profile:v main -crf 22 -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1" ../buffer/1080set.mp4

  It seems to add long pause at low frame-rate :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb03f05e600] Auto-inserting h264_mp4toannexb bitstream filter

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:18:52.56 bitrate=1348.0kbits

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:18:56.57 bitrate=1343.3kbits/

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:19:00.65 bitrate=1338.5kbits/

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:19:02.29 bitrate=1336.5kbits/

  More than 1000 frames duplicated

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2016-02-27T22:25:49.000000Z
  
      encoder         : HandBrake 0.10.5 2016021100
  
    Duration: 00:06:29.87, start: 0.000000, bitrate: 3447 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 768x432, 3282 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T22:25:49.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 159 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T22:25:49.000000Z
  
        handler_name    : Stereo
  
  
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
  
    Metadata:
  
      major_brand     : M4V 
  
      minor_version   : 1
  
      compatible_brands: M4V mp42isom
  
      creation_time   : 2016-02-27T18:52:37.000000Z
  
    Duration: 00:07:16.93, start: 0.000000, bitrate: 1184 kb/s
  
      Stream #1:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 768x432, 991 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T18:52:37.000000Z
  
        handler_name    : Mainconcept MP4 Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T18:52:37.000000Z
  
        handler_name    : Mainconcept MP4 Sound Media Handler
  
  
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '3.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2017-06-27T17:58:17.000000Z
  
    Duration: 00:05:05.05, start: 0.000000, bitrate: 2622 kb/s
  
      Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 768x432, 2301 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:58:17.000000Z
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
      Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:58:17.000000Z
  
        handler_name    : Alias Data Handler
  
  
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '4.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2017-06-27T17:53:32.000000Z
  
    Duration: 00:06:47.36, start: 0.000000, bitrate: 3144 kb/s
  
      Stream #3:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 768x432, 2819 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:53:32.000000Z
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
      Stream #3:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:53:32.000000Z
  
        handler_name    : Alias Data Handler