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• Merge two MP3 files and maintain high bitrate and original properties of MP3s

  19 juillet 2019, par sigur7

  I have two MP3 files that were created from the same source, with different audio within them. Here are the properties from ffprobe

  Duration: 00:00:08.86, bitrate: 384 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 24000 Hz, 1 channels, s16, 384 kb/s

  NOTE : Even though the file is an MP3 it shows as pcm_s16le

  When I try and join the two files together using
  ffmpeg -i download.mp3 -i download1.mp3 -filter_complex [0:a:0][1:a:0]concat=n=2:v=0:a=1[outa] -map [outa] joineddownloads.mp3

  I get the following result and a big drop in bitrate(quality)

  Duration: 00:00:10.42, start: 0.046042, bitrate: 32 kb/s
  
      Stream #0:0: Audio: mp3, 24000 Hz, mono, fltp, 32 kb/s

  How can I maintain the high 320kbs bitrate and all the other properties that were present before I created the joined file ?

• avcodec/cavsdec : Limit the number of access units per packet to 2

  10 août 2019, par Michael Niedermayer

  avcodec/cavsdec : Limit the number of access units per packet to 2
  Fixes : Timeout (122sec -> 13ms)
  
  Fixes : 15978/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CAVS_fuzzer-5148925004087296
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/cavsdec.c

• ffmpeg send video to ffserver without reencode, CPU usage still very high.How ?

  3 septembre 2019, par Wayne Chen

  I’m using ffmpeg to send H.264 video to ffserver. Command looks like this :

  ffmpeg -re -stream_loop -1 -i test.mp4 -c copy http://localhost:8090/feed1.ffm

  I thought with -c copy option, the CPU usage of ffmpeg should be very low, but it actually used 99% of CPU.Please help cutdown the usage of CPU.
  Thanks

  ----------------------

  ffserver.conf :

  <feed>
  
  File /tmp/feed1.ffm
  
  FileMaxSize 5M
  
  ACL allow 127.0.0.1
  
  ACL allow 192.168.1.250
  
  </feed>
  
  
  
  <stream>
  
  Feed feed1.ffm
  
  Format rtp
  
  VideoCodec libx264
  
  VideoFrameRate 25
  
  VideoBufferSize 80000
  
  VideoSize 1920x1080
  
  PreRoll 15
  
  NoDefaults
  
  NoAudio
  
  </stream>

  ffserver log：

  ffserver -d -f /etc/ffserver.conf
  
  ffserver version 3.3.9 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  
    configuration: --enable-gpl --enable-nonfree --enable-pthreads --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-version3 --enable-ffplay --enable-ffserver --enable-shared
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Tue Sep  3 09:45:38 2019 Codecs do not match for stream 0
  
  Tue Sep  3 09:45:38 2019 [ffm @ 0x1072d80]Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Tue Sep  3 09:45:38 2019 Codecs do not match for stream 0
  
  Tue Sep  3 09:45:38 2019 [ffm @ 0x10695e0]Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Tue Sep  3 09:45:38 2019 FFserver started.
  
  Tue Sep  3 09:45:39 2019 192.168.1.240 - - [] " " 200 0
  
  Tue Sep  3 09:45:39 2019 192.168.1.240 - - [] " " 200 0
  
  Tue Sep  3 09:45:39 2019 192.168.1.240:0 - - "PLAY test2-rtsp/streamid=0 RTP/TCP"
  
  Tue Sep  3 09:45:39 2019 192.168.1.240:0 - - "PLAY test1-rtsp/streamid=0 RTP/TCP"
  
  Tue Sep  3 09:45:39 2019 192.168.1.240:0 - - "PLAY test2-rtsp/streamid=0 RTP/TCP"
  
  Tue Sep  3 09:45:39 2019 192.168.1.240:0 - - "PLAY test1-rtsp/streamid=0 RTP/TCP"

  FFmpeg log：

  wayne@ubuntu:~$ ffmpeg -re -stream_loop -1 -i test_main.mp4 -c copy http://localhost:8090/feed1.ffm & ffmpeg -re -stream_loop -1 -i test_minor.mp4
  
  4 -c copy http://localsudffmpeg -re -stream_loop -1 -i test_main.mp4 -c copy http://localhost:8090/feed1.ffm & ffmpm
  
  ffmpeg version 3.3.9 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
  
    configuration: --enable-gpl --enable-nonfree --enable-pthreads --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-version3 --enable-ffplay --enable-ffserver --enable-shared
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_main.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:00:51.60, start: 0.000000, bitrate: 987 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 985 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [tcp @ 0x19ca600] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  [tcp @ 0x19d58a0] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x19d67c0] VBV bufsize set but maxrate unspecified, ignored
  
  [libx264 @ 0x19d67c0] using SAR=1/1
  
  [libx264 @ 0x19d67c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x19d67c0] profile Progressive High, level 4.0, 4:2:0, 8-bit
  
  Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : now
  
      encoder         : Lavf57.71.100
  
      Stream #0:0(eng): Video: h264 (libx264), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 1000k tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 655360000 vbv_delay: -1
  
  frame=   13 fps=0.0 q=0.0 size=       4kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   26 fps= 26 q=0.0 size=       4kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   38 fps= 25 q=0.0 size=       4kB time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=   43 fps= 18 q=28.0 size=       4kB time=-00:00:00.03 bitrate=N/A speed=N/A    
  
  frame=   55 fps= 19 q=28.0 size=      16kB time=00:00:00.44 bitrate= 297.9kbits/s speed=0.151x    
  
  frame=   59 fps= 17 q=28.0 size=      44kB time=00:00:00.60 bitrate= 600.7kbits/s speed=0.171x