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• About "ffmpeg -c copy" two ts files, can not play the problem

  4 septembre 2022, par Orlando Bloom

  aaa.mp4

  


  General
Complete name                            : C:/aaa.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 3.08 MiB
Duration                                 : 11 s 512 ms
Overall bit rate                         : 2 248 kb/s
Writing application                      : Lavf57.83.100
Comment                                  : GIFSHOW [899819595][iOS][11.4.1][iPhone9,2][5.8.5.606][Camera:f]#[720x1280][5327k][78k][C][1][tv=bec1_f80c][ags=0.455141][agm=0.747282][agsi=2000]

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 11 s 512 ms
Bit rate                                 : 2 161 kb/s
Width                                    : 720 pixels
Height                                   : 1 280 pixels
Display aspect ratio                     : 0.563
Frame rate mode                          : Constant
Frame rate                               : 29.970 (29970/1000) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.078
Stream size                              : 2.96 MiB (96%)
Writing library                          : x264 core 148
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC SBR
Format/Info                              : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name                          : HE-AAC
Format settings                          : Explicit
Codec ID                                 : mp4a-40-2
Duration                                 : 11 s 501 ms
Bit rate mode                            : Constant
Bit rate                                 : 78.8 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 44.1 kHz
Frame rate                               : 21.533 FPS (2048 SPF)
Compression mode                         : Lossy
Stream size                              : 111 KiB (4%)
Default                                  : Yes
Alternate group                          : 1




  


  I want to merge this mp4 with another ts file, because my hardware configuration is very poor, so I choose "-c copy"

  


  General
ID                                       : 1 (0x1)
Complete name                            : C:/bbb.ts
Format                                   : MPEG-TS
File size                                : 3.41 MiB
Duration                                 : 15 s 315 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 1 861 kb/s

Video
ID                                       : 256 (0x100)
Menu ID                                  : 1 (0x1)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : 27
Duration                                 : 15 s 382 ms
Width                                    : 1 080 pixels
Height                                   : 606 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive

Audio
ID                                       : 257 (0x101)
Menu ID                                  : 1 (0x1)
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Format version                           : Version 4
Muxing mode                              : ADTS
Codec ID                                 : 15-2
Duration                                 : 15 s 185 ms
Bit rate mode                            : Variable
Channel(s)                               : 1 channel
Channel layout                           : C
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Delay relative to video                  : -46 ms





  


  I directly -c copy them, can't play the whole thing,

  


  Then I convert aaa.mp4 to ts
using "ffmpeg -i aaa.mp4 -bsf:v h264_mp4toannexb -codec copy -hls_list_size 0 aaa.ts" , this is what I googled.

  


  Finally tried aaa.ts and bbb.ts with "-c copy", still can't play.

  


  My machine configuration is acceptable, convert aaa.mp4 to the same encoding as bbb.ts

  


  If I transcode both together, I can't do it because bbb.ts is too big.

  


• Video Processing via Bluetooth

  16 juillet 2012, par kerim yucel

  The application I am currently developing processes each frames using a native code and it should record the video as well. I tried SDK for this purpose but certain restrictions didn't allow me to do so, so I switched to NDK for a video recording code piece.

  Apparently, my algorithm seriously uses CPU, upto %70 percent in the worst case. Before I actually start working on a video recorder, I wanted to try the following approach.

  I will process the preview frames using an android phone and send it to another phone (which uses same application and same model) for recording. My questions are :

  1.Should I try WiFi instead of Bluetooth ? I am developing the application for API 8 so I don't have WiFi-Direct, therefore I should do some socket programming, which would possibly complicate things a bit for me since Bluetooth can easily be set up using SDK.

  2- Will I be available to record the frames as a video at the receiving end ? I will receive each frame with certain metadata embedded to it and should record them using the other phone. I doubt I will be able to do it using SDK, so NDK along with ffmpeg seems to be the best choice ? Any suggestions related to this question will be more than welcome.

  3-Here comes the best part. I am recording the video with the lowest resolution that,after compressed, takes no more than 14mb space for a 10 minute long video. I have to reach the raw frames to send it to other end, encode and compress it. Any ideas related to possible flooding of Bluetooth/Wi-Fi because of big-sized raw frames ?

  Any other approaches and answers will be much appreciated. Thanks.

• Android RTSP streaming buffer size for delayed playback

  19 novembre 2012, par frijj2k

  I can access and view RTSP streams from IP cameras on Android via the VideoView component without problems.

  Now I need to play the RTSP stream with a delay (i.e. if I specify a 30 second delay, the playback on screen should be 30 seconds behind the source and the delay needs to be variable though not during playback, only at the point of connecting to the source).

  I originally thought this would not be a problem as I could simply change the RTSP buffer duration before connecting to the camera but unfortunately it seems the buffer size is baked into the firmware and cannot be changed in software. Now I have got a horrible feeling that my way forward will be to compile a version of FFMpeg for Android and somehow get the stream data out from the library, buffer it and then render it myself and I have no experience with FFMpeg.

  I am unsure how I would now go about solving this problem and any help or pointers in the right direction would be greatly appreciated.

  Update :

  Sorry I forgot to mention, the RTSP stream is being accessed over WiFi on a LAN so no huge latency issues here from going over the Internet.