Estou com dificuldades com os timestamps dos meus vídeos. Eles foram originalmente criados com o Windows Movie Maker no formato WMV e eu configurei manualmente a data de criação. Mais tarde eu migrei para o Ubuntu e converti todos eles para o formato MP4 usando o programa avconv . O problema é que o Picasa (no Ubuntu) está ignorando o timestamp do arquivo MP4 (que eu posso definir para o que eu quiser) e ainda está relatando a data e hora de conversão original. É algum tipo de metadado MP4? Como posso ver / editar?
EDIT: Como exemplo, eu converti ZOO.wmv para ZOO.mp4 usando avconv -i ZOO.wmv -strict experimental -b:v 2000k ZOO.mp4
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Mediainfo do arquivo WMV original:
General
Complete name : ZOO.wmv
Format : Windows Media
File size : 24.5 MiB
Duration : 1mn 39s
Overall bit rate mode : Constant
Overall bit rate : 2 074 Kbps
Maximum Overall bit rate : 2 079 Kbps
Movie name : ZOO
Encoded date : UTC 2010-09-27 21:08:25.781
Application : Windows Movie Maker 2.1.4028.0
Video
ID : 2
Format : VC-1
Format profile : MP@ML
Codec ID : WMV3
Codec ID/Info : Windows Media Video 9
Codec ID/Hint : WMV3
Description of the codec : Windows Media Video 9 - Professional
Duration : 1mn 39s
Bit rate mode : Constant
Bit rate : 1 900 Kbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate : 25.000 fps
Standard : PAL
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.183
Stream size : 22.5 MiB (92%)
Language : Czech
Audio
ID : 1
Format : WMA
Format version : Version 2
Codec ID : 161
Codec ID/Info : Windows Media Audio
Description of the codec : Windows Media Audio 9.2 - 160 kbps, 44 kHz, stereo (A/V) 1-pass CBR
Duration : 1mn 39s
Bit rate mode : Constant
Bit rate : 160 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 1.89 MiB (8%)
Language : Czech
Observe que a Data codificada foi definida pelo Windows Movie Maker e não é o registro de data e hora da criação do arquivo (definido manualmente no Windows).
Mediainfo do arquivo MP4 convertido:
General
Complete name : ZOO.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 26.0 MiB
Duration : 1mn 39s
Overall bit rate mode : Variable
Overall bit rate : 2 196 Kbps
Movie name : ZOO
Writing application : Lavf53.21.0
Video
ID : 1
Format : MPEG-4 Visual
Format profile : Simple@L1
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : 20
Duration : 1mn 39s
Bit rate : 2 008 Kbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 5:4
Frame rate mode : Constant
Frame rate : 25.000 fps
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.194
Stream size : 23.7 MiB (91%)
Writing library : Lavc53.35.0
Language : Czech
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 1mn 39s
Bit rate mode : Variable
Bit rate : 184 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 2.18 MiB (8%)
Language : Czech