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• M4a (mp4) audio file encoded with pydub+ffmpeg doesn't play on Android

  6 juillet 2020, par Evelyn

  I have a python script to split up some wav files and export to m4a using pydub. I'm able to get these files to play on several devices, but not on an Android device (using Google Pixel 3). When I try encoding with straight ffmpeg in terminal, that works fine on the Android device.

  


  What is the difference in these two files, and since pydub is using ffmpeg, what do I need to change to make it do exactly the same as the ffmpeg command ?

  


  Not working

  


  from pydub import AudioSegment
>>> audio = AudioSegment.from_wav("input.wav")
>>> slice = audio[1000:3000]
>>> slice.export("pydub_export.m4a", format="mp4", parameters=["-ac", "1", "-c:a", "libfdk_aac", "-profile:a", "aac_he", "-vbr", "2"])


  


  mediainfo output :

  


  General
Complete name                            : pydub_export.m4a
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/mp41)
File size                                : 11.7 KiB
Duration                                 : 2 s 115 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 45.1 kb/s
Writing application                      : Lavf58.29.100

Audio
ID                                       : 1
Format                                   : AAC LC SBR
Format/Info                              : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name                          : HE-AAC
Format settings                          : NBC
Codec ID                                 : mp4a-40-5
Duration                                 : 2 s 115 ms
Duration_LastFrame                       : -22 ms
Bit rate mode                            : Constant
Bit rate                                 : 41.4 kb/s
Channel(s)                               : 1 channel
Channel layout                           : C
Sampling rate                            : 44.1 kHz
Frame rate                               : 21.533 FPS (2048 SPF)
Compression mode                         : Lossy
Stream size                              : 10.7 KiB (92%)
Default                                  : Yes
Alternate group                          : 1


  


  Working

  


  $ffmpeg -i input.wav -acodec copy -ss 1 -to 3 input_slice.wav
$ffmpeg -i input_slice.wav -ac 1 -c:a libfdk_aac -profile:a aac_he -vbr 2 ffmpeg_export.m4a


  


  mediainfo output :

  


  General
Complete name                            : ffmpeg_export.m4a
Format                                   : MPEG-4
Format profile                           : Apple audio with iTunes info
Codec ID                                 : M4A  (isom/iso2)
File size                                : 11.2 KiB
Duration                                 : 2 s 112 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 43.6 kb/s
Writing application                      : Lavf58.29.100

Audio
ID                                       : 1
Format                                   : AAC LC SBR
Format/Info                              : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name                          : HE-AAC
Format settings                          : NBC
Codec ID                                 : mp4a-40-5
Duration                                 : 2 s 112 ms
Duration_LastFrame                       : -25 ms
Bit rate mode                            : Constant
Bit rate                                 : 39.9 kb/s
Channel(s)                               : 1 channel
Channel layout                           : C
Sampling rate                            : 44.1 kHz
Frame rate                               : 21.533 FPS (2048 SPF)
Compression mode                         : Lossy
Stream size                              : 10.3 KiB (91%)
Default                                  : Yes
Alternate group                          : 1


  


  I already tried moving metadata to the front with -movflags faststart on the broken file and it didn't make a difference.

  


• video uploading from app using ffmpeg showing error

  9 juillet 2020, par Dhananjay Acharya

  I am trying to implement video upload from app using ffmpeg. when I m trying to upload video showing this errors. sometime video upload keep on loading. any help.

  


  sometimes app freezes and for some videos showing out of memory error

  


  when i run in a real device logcat details

  


  2020-07-09 12:48:14.240 5226-7065/com.mik I/OMXClient: MuxOMX ctor
2020-07-09 12:48:14.369 5226-5226/com.mik I/Choreographer: Skipped 32 frames!  The application may be doing too much work on its main thread.
2020-07-09 12:48:14.377 5226-5857/com.mik D/AudioManager: getStreamVolume isRestricted mode = 0
2020-07-09 12:48:14.401 5226-7067/com.mik D/AudioManager: getStreamVolume isRestricted mode = 0
2020-07-09 12:48:14.468 5226-7065/com.mik E/ACodec: [OMX.qcom.video.encoder.avc] storeMetaDataInBuffers (output) failed w/ err -1010
2020-07-09 12:48:14.468 5226-7065/com.mik I/ExtendedACodec: setupVideoEncoder()
2020-07-09 12:48:14.469 5226-7065/com.mik W/ACodec: do not know color format 0x7fa30c04 = 2141391876
2020-07-09 12:48:14.471 5226-7065/com.mik W/ACodec: do not know color format 0x7f000789 = 2130708361
2020-07-09 12:48:14.521 5226-7065/com.mik I/ACodec: setupAVCEncoderParameters with [profile: Baseline] [level: Level1]
2020-07-09 12:48:14.543 5226-7065/com.mik I/ACodec: [OMX.qcom.video.encoder.avc] cannot encode HDR static metadata. Ignoring.
2020-07-09 12:48:14.543 5226-7065/com.mik I/ACodec: setupVideoEncoder succeeded
2020-07-09 12:48:14.544 5226-7065/com.mik I/ExtendedACodec: [OMX.qcom.video.encoder.avc] configure, AMessage : AMessage(what = 'conf', target = 13) = {
      int32_t width = 720
      int32_t height = 1280
      int32_t bitrate = 2073600
      string mime = "video/avc"
      int32_t frame-rate = 30
      int32_t i-frame-interval = 1
      int32_t color-format = 2130708361
      int32_t encoder = 1
    }
2020-07-09 12:48:14.549 5226-7065/com.mik W/ACodec: do not know color format 0x7f000789 = 2130708361
2020-07-09 12:48:14.556 5226-6625/com.mik D/FA: Connected to remote service
2020-07-09 12:48:14.557 5226-6625/com.mik V/FA: Processing queued up service tasks: 1
2020-07-09 12:48:14.877 5226-7104/com.mik I/OMXClient: MuxOMX ctor
2020-07-09 12:48:14.946 5226-7103/com.mik I/MediaCodec: [OMX.qcom.video.decoder.avc] setting surface generation to 5351428
2020-07-09 12:48:14.948 5226-7104/com.mik I/ExtendedACodec: setupVideoDecoder()
2020-07-09 12:48:14.948 5226-7104/com.mik I/ExtendedACodec: vpp-enable search is 0 and value is 0
2020-07-09 12:48:14.955 5226-7104/com.mik I/ExtendedACodec: Decoder will be in frame by frame mode
2020-07-09 12:48:14.980 5226-7104/com.mik D/SurfaceUtils: set up nativeWindow 0x7f84499e10 for 352x640, color 0x7fa30c06, rotation 0, usage 0x2002900
2020-07-09 12:48:15.065 5226-7028/com.mik D/resp: 0
2020-07-09 12:48:15.072 5226-7104/com.mik D/SurfaceUtils: set up nativeWindow 0x7f84499e10 for 352x640, color 0x7fa30c06, rotation 0, usage 0x2002900
2020-07-09 12:48:15.152 5226-7065/com.mik D/ACodec: dataspace changed to 0x10c10000 (R:2(Limited), P:3(BT601_6_625), M:3(BT601_6), T:3(SMPTE170M)) (R:2(Limited), S:1(BT709), T:3(SMPTE_170M))

2020-07-09 12:48:15.469 5226-7028/com.mik V/MuxRender: Added track #0 with video/avc to muxer
2020-07-09 12:48:15.469 5226-7028/com.mik V/MuxRender: Added track #1 with audio/mp4a-latm to muxer
2020-07-09 12:48:15.646 5226-7028/com.mik I/MPEG4Writer: limits: 4294967295/0 bytes/us, bit rate: -1 bps and the estimated moov size 3195 bytes
2020-07-09 12:48:15.647 5226-7028/com.mik V/MuxRender: Output format determined, writing 15 samples / 6054 bytes to muxer.
2020-07-09 12:48:15.647 5226-7140/com.mik I/MPEG4Writer: setStartTimestampUs: 0
2020-07-09 12:48:15.647 5226-7140/com.mik I/MPEG4Writer: Earliest track starting time: 0
2020-07-09 12:48:15.650 5226-7139/com.mik I/MPEG4Writer: setStartTimestampUs: 0
2020-07-09 12:48:27.318 5226-7028/com.mik D/MPEG4Writer: Video track stopping
2020-07-09 12:48:27.318 5226-7139/com.mik I/MPEG4Writer: Received total/0-length (401/1) buffers and encoded 401 frames. - Video
2020-07-09 12:48:27.326 5226-7140/com.mik I/MPEG4Writer: Received total/0-length (641/1) buffers and encoded 641 frames. - Audio
2020-07-09 12:48:27.326 5226-7140/com.mik I/MPEG4Writer: Audio track drift time: 0 us
2020-07-09 12:48:27.327 5226-7028/com.mik D/MPEG4Writer: Audio track stopped
2020-07-09 12:48:27.327 5226-7028/com.mik D/MPEG4Writer: Duration from tracks range is [14850005, 14883989] us
2020-07-09 12:48:27.327 5226-7028/com.mik D/MPEG4Writer: Stopping writer thread
2020-07-09 12:48:27.329 5226-7138/com.mik D/MPEG4Writer: 1 chunks are written in the last batch
2020-07-09 12:48:27.329 5226-7028/com.mik D/MPEG4Writer: Writer thread stopped
2020-07-09 12:48:27.332 5226-7028/com.mik I/MPEG4Writer: The mp4 file will not be streamable.
2020-07-09 12:48:27.378 5226-7104/com.mik E/BufferQueueProducer: [SurfaceTexture-1-5226-2] cancelBuffer: BufferQueue has been abandoned
2020-07-09 12:48:27.465 5226-7028/com.mik D/MPEG4Writer: Video track stopping
2020-07-09 12:48:27.494 5226-5226/com.mik I/Timeline: Timeline: Activity_launch_request time:148842468 intent:Intent { cmp=com.mik/.Video_Recording.GallerySelectedVideo.GallerySelectedVideo_A (has extras) }
2020-07-09 12:48:27.541 5226-6625/com.mik V/FA: Recording user engagement, ms: 13774
2020-07-09 12:48:27.561 5226-6625/com.mik V/FA: Connecting to remote service
2020-07-09 12:48:27.578 5226-5857/com.mik D/AudioManager: getStreamVolume isRestricted mode = 0
2020-07-09 12:48:27.584 5226-6625/com.mik V/FA: Activity paused, time: 160261301
2020-07-09 12:48:27.652 5226-6625/com.mik V/FA: Connection attempt already in progress
2020-07-09 12:48:27.727 5226-5226/com.mik I/ExoPlayerImpl: Init d0eca9e [ExoPlayerLib/2.11.1] [oxygen, MI MAX 2, Xiaomi, 25]


  


• Send sprop-parameter-sets inband rather than in SDP

  21 janvier 2021, par Max

  I am trying to use ffmpeg to stream an MP4 file over rtp. I am sending the stream to a SFU server that will broadcast the stream to users. The clients are expecting to receive an h264 video stream with profile-level-id 42e01f. The issue I'm having is that the video received by the clients does not decode properly (just a black screen). If I transcode the video before sending, then everything works correctly. If I dump the SDP that describes what ffmpeg is sending, there is a distinct difference between the transcoded and non-transcoded version.

  


  For the non-transcoded version, my ffmpeg command looks like

  


  ffmpeg  '-re' \
  '-v' \
  'info' \
  '-protocol_whitelist' \
  'pipe,tls,file,http,https,tcp,rtp' \
  '-i' \
  '-f' 'mp4' \
  'https://storage.googleapis.com/my_bucket/file' \
  '-map' \
  '0:v:0' \
  '-c:v' \
  'copy' \
  '-f' \
  'rtp' \
  '-sdp_file' 'out.sdp' \
  'rtp://142.93.14.110:40425?rtcpport=45155'


  


  When I run this command, out.sdp contains the line

  


  a=fmtp:96 packetization-mode=1; sprop-parameter-sets=Z0LAH9kAUAW7AWoCAgKAAAH0gABdwAeMGSQ=,aMuMsg==; profile-level-id=42C01F


  


  However, if I change -c:v copy to -c:v libx264 -preset ultrafast, then the sdp line changes to a=fmtp:96 packetization-mode=1;. Given that there is no SDP exchange between ffmpeg and my SFU, I think the issue is that ffmpeg needs to be sending the sprops in-band rather than setting them in the sdp. Any help here would be amazing. The other possible issue is that the profile levels are sightly different.